CN112229499B - Sound field measuring system and control method thereof - Google Patents
Sound field measuring system and control method thereof Download PDFInfo
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- CN112229499B CN112229499B CN202010968757.5A CN202010968757A CN112229499B CN 112229499 B CN112229499 B CN 112229499B CN 202010968757 A CN202010968757 A CN 202010968757A CN 112229499 B CN112229499 B CN 112229499B
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Abstract
The invention discloses a sound field measuring system and a control method thereof, wherein the sound field measuring system comprises: a liquid coupling agent groove, wherein a liquid coupling agent is injected in the liquid coupling agent groove; the ultrasonic transducer is a planar phased array transducer meeting the antenna theory and is arranged in the liquid couplant groove; the collimator is arranged in the direction of the ultrasonic transducer for emitting the ultrasonic waves, the bottom of the collimator is matched with the ultrasonic transducer in a structure, and a clamping part is arranged at the upper part of the collimator; the signal acquisition module is used for picking up sound field signals and is matched with the clamping part; the motion module is used for controlling the signal acquisition module to move in the space; and the control module comprises data processing feedback software for picking up the signal of the signal acquisition module in real time, processing and feeding back the signal. According to the sound field measurement system, the accurate absolute position of the top of the signal acquisition module in the coordinate system of the ultrasonic transducer can be determined, so that the accuracy of sound field measurement is ensured.
Description
Technical Field
The invention relates to the technical field of medical treatment, in particular to a sound field measuring system and a control method thereof.
Background
In the related art, the existing HIFU acoustic field measurement system and method are mainly directed to a spherical HIFU transducer including an inherent focus. The spherical transducer has a small or no self-focusing ultrasonic regulation range, the focal domain form is relatively fixed, and the measurement is simple. For the planar HIFU phased array transducer meeting the antenna theory, the focus regulation adopts a fully electronic mode, the regulation range of focused ultrasound is large, and the corresponding focus area form is not fixed. The existing HIFU sound field measurement system and method do not provide a measurement scheme for obtaining the focal point regulation and control range of a planar HIFU phased array transducer which meets the antenna theory in a targeted manner.
Existing HIFU acoustic field measurement systems and methods have limitations in determining the absolute position of the hydrophone tip at the ultrasound transducer coordinate system. In the prior art, a pulse input mode of a transducer is generally set, a hydrophone is used for finding out maximum sound pressure, a signal at the input end of the transducer is used as a trigger signal, the trigger signal is compared with a signal received by the hydrophone to obtain ultrasonic flight time, and the ultrasonic flight time is multiplied by the sound velocity of water at the moment to obtain a coordinate of the top of the hydrophone, wherein the coordinate is positioned on the z axis of a transducer coordinate system (namely, right in front of the transducer); for coordinates in the xOy plane perpendicular to the z-axis, the hydrophone top is then generally centered based on the axial symmetry of the spherical transducer. Errors are easily introduced into the absolute position of the top of the hydrophone located in the coordinate system of the ultrasonic transducer based on the scheme, and the uncertainty is large.
In view of the relative simplicity of acoustic field measurement of spherical HIFU transducers, existing acoustic field measurement systems and methods for such transducers do not substantially contain measurement feedback, but rather obtain acoustic field parameters through separate or simple data post-processing. When the method is applied to sound field measurement and sound field parameter acquisition of the planar HIFU phased array transducer meeting the antenna theory, the method is troublesome and lagged, and is not beneficial to real-time feedback adjustment of the transducer parameters.
Disclosure of Invention
The present invention is directed to solving at least one of the problems of the prior art. To this end, it is an object of the present invention to provide a sound field measurement system that facilitates determining an accurate absolute position of a top of a signal acquisition module in a coordinate system of an ultrasonic transducer, thereby ensuring accuracy of sound field measurement.
Another object of the present invention is to provide a sound field measuring method, which employs the above sound field measuring system.
A sound field measuring system according to an embodiment of the first aspect of the present invention includes: the liquid coupling agent tank is filled with a liquid coupling agent; the ultrasonic transducer is a planar phased array transducer which meets the antenna theory, and is arranged in the liquid couplant groove; the collimator is arranged in the direction in which the ultrasonic transducer emits ultrasonic waves, the bottom of the collimator is configured to be matched with the ultrasonic transducer, and a clamping part is arranged at the upper part of the collimator; the signal acquisition module is used for picking up sound field signals and is matched with the clamping part; the motion module is used for controlling the signal acquisition module to move in space; and the control module comprises data processing feedback software for picking up the signal of the signal acquisition module in real time, processing and feeding back the signal.
According to the sound field measurement system provided by the embodiment of the invention, the customized collimator is configured for the ultrasonic transducer, so that the accurate absolute position of the top of the signal acquisition module, which is positioned in the coordinate system of the ultrasonic transducer, can be favorably determined, and the signal of the signal acquisition module can be picked up in real time through data processing feedback software and processed and fed back, so that the real-time feedback adjustment of the parameters of the ultrasonic transducer can be favorably realized, and the accuracy of sound field measurement is further ensured.
In addition, the sound field measurement system according to the above embodiment of the present invention has the following additional technical features:
according to some embodiments of the invention, the signal acquisition module is a hydrophone.
Further, the clamping portion is an opening formed at the top of the collimator.
According to some embodiments of the invention, the sound field measurement system further comprises a signal processing module comprising: the preamplifier is connected with the hydrophone and is used for amplifying the electric signal converted by the hydrophone; the coupler is matched with the preamplifier and used for supplying power to the preamplifier and performing signal coupling; and the oscilloscope is used for picking up the hydrophone signals on the coupler and displaying the signals in real time.
According to some embodiments of the invention, the motion module comprises an X-axis, a Y-axis and a Z-axis, the Z-axis is provided with a support, and the signal acquisition module is adapted to be connected to the motion module through the support.
According to some embodiments of the present invention, the sound field measuring system further comprises a frame having a stage formed at a top thereof, and the liquid couplant tank is provided on the stage.
In some embodiments of the present invention, the liquid couplant is water, and the acoustic field measurement system further comprises: a water treatment module for ensuring that the oxygen content of the water in the liquid couplant tank is not higher than 4 ppm.
According to some embodiments of the invention, the sound field measurement system further comprises: and the sound absorption material piece is arranged on the inner surface of the liquid couplant groove to absorb sound waves.
A control method of a sound field measurement system according to an embodiment of a second aspect of the present invention, the control method employing the sound field measurement system described above, includes the steps of: step S10: determining the accurate absolute position of the top of the signal acquisition module in the coordinate system of the ultrasonic transducer; step S20: setting the top coordinates of the signal acquisition module in the sound field measurement system coordinate system as coordinates corresponding to the absolute position of the top of the signal acquisition module in the ultrasonic transducer coordinate system; step S30: setting a regulation and control range of a primarily selected ultrasonic electronic focusing point to be detected according to the size of the ultrasonic transducer; step S40: setting discretely filled focuses in the regulation range of the primarily selected ultrasonic electronic focusing point to be detected; step S50: the ultrasonic transducer emits ultrasonic waves based on an ultrasonic transducer coordinate system and focuses the ultrasonic waves to a set focus, the signal acquisition module moves the top of the signal acquisition module to the position of the focus based on the ultrasonic transducer coordinate system, then a maximum peak value of received voltage is searched near the focus, and the maximum peak value and corresponding coordinates of the maximum peak value are recorded; step S60: the motion module controls the signal acquisition module to move, and the step S50 is repeated to traverse all the focuses; step S70: the data processing feedback software processes the measurement data recorded in the step S50 and the step S60 to obtain the focusing performance of the ultrasonic transducer.
According to the control method of the sound field measurement system in the second aspect of the present invention, by using the sound field measurement system in the first aspect of the present invention, it is beneficial to determine the precise absolute position of the top of the signal acquisition module in the coordinate system of the ultrasonic transducer, so as to ensure the accuracy of the sound field measurement. And the control method comprises a measurement feedback step, which is beneficial to the real-time feedback adjustment of the parameters of the ultrasonic transducer.
According to some embodiments of the invention, the signal acquisition module is a hydrophone, the clamping portion is an opening formed at a top of the collimator, and the step S10 includes: and controlling the movement of the hydrophone by controlling the movement of the motion module, so that the top of the hydrophone is aligned with the opening on the collimator, and the top of the hydrophone is superposed with the opening to determine the accurate absolute position of the top of the hydrophone in the coordinate system of the ultrasonic transducer.
According to some embodiments of the invention, the step S30 includes: the transverse dimension is set as the maximum outline dimension of the ultrasonic transducer, and the longitudinal dimension is determined based on the thickness of the sagittal plane of human anatomy.
According to some embodiments of the present invention, the step S70 includes, based on the measurement data, calculating by data processing feedback software to provide a focus deviation distribution and a voltage peak-to-peak distribution of the ultrasound transducer at each set focus point within a primarily selected ultrasonic electronic focus point regulation range, presetting by the data processing feedback software a focus deviation threshold and a voltage peak-to-peak threshold, and drawing by the data processing feedback software an area where the focus deviation and the voltage peak-to-peak value are within the threshold range according to the focus deviation threshold and the voltage peak-to-peak threshold, so as to obtain a focus range based on the preset threshold.
According to some embodiments of the invention, the focus bias threshold comprises a lateral bias threshold and a longitudinal bias threshold, the lateral bias threshold being no greater than 3mm, the longitudinal bias threshold being no greater than 5 mm; the voltage peak-to-peak value comprises a minimum voltage peak-to-peak value and a maximum voltage peak-to-peak value, and the voltage peak-to-peak value threshold value is 6dB or 3dB drop of the minimum voltage peak-to-peak value compared with the maximum voltage peak-to-peak value.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
FIG. 1 is a schematic diagram of a sound field measurement system according to an embodiment of the present invention;
FIG. 2 is an enlarged view of a portion of a liquid couplant slot in the acoustic field measurement system of FIG. 1 in accordance with an embodiment of the present invention;
FIG. 3 is an enlarged view of a hydrophone and a preamplifier in the sound field measurement system of FIG. 1, in accordance with an embodiment of the present invention;
FIG. 4 is an enlarged view of a collimator in the sound field measuring system of FIG. 1 according to an embodiment of the present invention;
FIG. 5 is a schematic diagram of the sound field measurement system of FIG. 1 based on collimator calibration for accurate absolute position of the hydrophone head in accordance with an embodiment of the invention;
fig. 6 is a flowchart of a control method of a sound field measuring system according to an embodiment of the present invention;
FIG. 7 is a 3D schematic diagram of the initially selected control range of the ultrasonic electronic focus point to be measured in the control method of the sound field measurement system in FIG. 6 according to the embodiment of the invention;
FIG. 8 is a 2D schematic top view of the initially selected control range of the ultrasonic electronic focus point to be measured in the control method of the sound field measurement system in FIG. 6 according to the embodiment of the invention;
fig. 9 is a focusing deviation (mm) of an actual focus measured by a hydrophone in a primarily selected focusing range in the control method of the sound field measurement system in fig. 6 according to the embodiment of the invention;
fig. 10 is a diagram illustrating a voltage peak-to-peak value (millivolts: mV) of an actual focus measured by a hydrophone in a primarily selected focusing range in the control method of the sound field measurement system in fig. 6 according to the embodiment of the invention.
Reference numerals:
the sound field measurement system 100 is provided with,
a liquid couplant groove 1, a liquid inlet and outlet 11,
the ultrasonic transducers 2 are arranged in a row in the longitudinal direction,
the collimator 3, the clamping portion 31,
the signal acquisition module 4, the hydrophone 41,
a motion module 5, an X-axis 51, a Y-axis 52, a Z-axis 53, a bracket 531,
a control module 6, a host computer 61, a mouse 62, a keyboard 63, a display 64,
a signal processing module 7, a preamplifier 71, a coupler 72, an oscilloscope 73,
the frame 8, the operation table 81,
the water treatment module (9) is provided with a water treatment device,
a piece of sound absorbing material 10.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.
A sound field measuring system 100 according to an embodiment of the present invention is described below with reference to the drawings.
Referring to fig. 1 and 2, a sound field measurement system 100 according to an embodiment of the first aspect of the present invention includes: the device comprises a liquid couplant tank 1, an ultrasonic transducer 2, a collimator 3, a signal acquisition module 4, a motion module 5 and a control module 6.
Specifically, a liquid couplant is injected into the liquid couplant tank 1. The ultrasonic transducer 2 is a planar phased array transducer satisfying the antenna theory, and the ultrasonic transducer 2 is arranged in the liquid couplant tank 1. The phase-controlled High Intensity Focused Ultrasound (High Intensity Focused Ultrasound-HIFU) has the characteristics that the focus can be automatically controlled and the focuses are Focused simultaneously, so that the tumor treatment operation time is shortened, the pain of a patient is relieved, and the treatment efficiency is improved.
The collimator 3 is provided in a direction in which the ultrasonic transducer 2 emits the ultrasonic waves, and a bottom portion of the collimator 3 is configured to fit the ultrasonic transducer 2 and an upper portion thereof is provided with a clamping portion 31.
For example, referring to fig. 4 and 5, the collimator 3 may be provided above the ultrasound transducer 2 shown in fig. 5, and the bottom of the collimator 3 is configured to fit the ultrasound transducer 2, which facilitates assembly between the collimator 3 and the ultrasound transducer 2.
Referring to fig. 4, an upper portion of the collimator 205 may be provided with a clamping portion 31. The signal acquisition module 4 is used for picking up sound field signals, and the signal acquisition module 4 is matched with the clamping part 31.
In some embodiments of the invention, the bottom of the collimator 3 is detachably connected to the ultrasound transducer 2. For example, the collimator 3 is mounted on the ultrasound transducer 2 so as to determine the precise absolute position of the top of the signal acquisition module 4 on the ultrasound transducer coordinate system, and after determining the precise absolute position of the top of the signal acquisition module 4 on the ultrasound transducer coordinate system, the collimator 3 may be separated from the ultrasound transducer 2.
The motion module 5 is used for controlling the signal acquisition module 4 to move in space. For example, the motion module 5 may be connected to the signal acquisition module 4, and by controlling the motion module 5 to move, the corresponding control of the movement of the signal acquisition module 4 in the space may be achieved.
The control module 6 comprises data processing feedback software for picking up the signals of the signal acquisition module 4 in real time, processing and feeding back the signals. In other words, the control module 6 includes data processing feedback software that can be used to pick up the signal of the signal acquisition module 4 in real time and process and feed back it. Therefore, the data processing feedback software can pick up the signal of the signal acquisition module 4 in real time, process and feed back the signal, thereby being beneficial to realizing the real-time feedback adjustment of the parameters of the ultrasonic transducer.
For example, the control module 6 may include a host 61, a mouse 62, a keyboard 63, and a display 64, and the data processing feedback software is loaded on the host 61.
According to the sound field measurement system 100 provided by the embodiment of the invention, the customized collimator 3 is configured for the ultrasonic transducer, so that the accurate absolute position of the top of the signal acquisition module 4 in the coordinate system of the ultrasonic transducer can be favorably determined, and the signal of the signal acquisition module 4 can be picked up in real time through data processing feedback software and processed and fed back, thereby being favorable for realizing the real-time feedback adjustment of the parameters of the ultrasonic transducer and further ensuring the accuracy of sound field measurement.
Referring to fig. 3, according to some embodiments of the present invention, the signal acquisition module 4 is a hydrophone 41. The hydrophones 41 may pick up the soundfield signals and convert them into electrical signals. Thus, by configuring the ultrasonic transducer with a custom collimator 3, it is advantageous to determine the exact absolute position of the top of the hydrophone 41 in the ultrasonic transducer coordinate system, thereby ensuring the accuracy of the sound field measurements.
Of course, in other embodiments of the present invention, the signal acquisition module 4 may be other components capable of acquiring signals.
Further, as shown in fig. 4, the clamping portion 31 is an opening formed at the top of the collimator. For example, in some embodiments of the invention, the clamping portion 31 may be configured as an aperture, which may be formed at the top of the collimator 3. Thus, by configuring the ultrasonic transducer 2 with a customized open-top collimator 3, it is beneficial to determine the precise absolute position of the hydrophone top in the ultrasonic transducer coordinate system, thereby ensuring the accuracy of the sound field measurement.
According to some embodiments of the invention, the hydrophones 41 are clearance fitted with the collimators 3. The apertures of the openings are for example slightly larger than the diameter of the hydrophone 41, thereby facilitating the assembly between the hydrophone 41 and the collimator 3.
Further, the diameter of the opening is not more than 0.2mm different from the diameter of the hydrophone 41. Thereby, it is advantageous to determine the exact absolute position of the hydrophone top at the coordinate system of the ultrasound transducer.
Further, the diameter of the opening does not differ from the diameter of the hydrophone 41 by more than 0.1 mm. This is more advantageous for determining the exact absolute position of the hydrophone top at the coordinate system of the ultrasound transducer. The difference between the diameter of the opening and the diameter of the hydrophone 41 can be adaptively set according to the needs, and the invention is not particularly limited to this.
According to the sound field measurement system 100 provided by the embodiment of the invention, the customized collimator 3 with the top opening is configured for the ultrasonic transducer, so that the accurate absolute position of the top of the hydrophone in the coordinate system of the ultrasonic transducer can be determined, and the accuracy of sound field measurement is ensured.
According to the sound field measurement system 100 of the embodiment of the invention, the bottom of the collimator 3 is designed according to the known external dimension of the ultrasonic transducer 2, so that the bottom of the collimator 3 is adapted to the external dimension of the ultrasonic transducer 2, and the collimator 3 can be fixed on the ultrasonic transducer 2 along the direction of the ultrasonic transducer 2 emitting ultrasonic waves, thereby determining the relative position relationship between the collimator 3 and the ultrasonic transducer 2. The middle part of the collimator 3 is not fixed, and can be adjusted according to the actual situation, only the bottom of the collimator 3 is required to be configured to be matched with the ultrasonic transducer 2, and the upper part of the collimator 3 is provided with a clamping part 31 (such as an opening and the like) which is fixed relative to the bottom and has a known position. Since the whole collimator 3 is self-designed and customized to fit the external dimensions of the ultrasonic transducer 2, the external dimensions are known, and the collimator 3 can also confirm the relative position relation with the ultrasonic transducer 2, the position of the opening at the top end of the collimator 3 relative to the ultrasonic transducer 2 can be obtained. And moving the hydrophone 41 to align the top of the hydrophone with the opening on the upper part of the collimator 3, and enabling the top of the hydrophone and the opening to coincide, so that the accurate absolute position of the top of the hydrophone in the coordinate system of the ultrasonic transducer can be determined.
Referring to fig. 1 and 3, according to some embodiments of the present invention, the sound field measurement system 100 further includes a signal processing module 7, and the signal processing module 7 includes: a preamplifier 71, a coupler 72, and an oscilloscope 73.
Specifically, referring to FIG. 3, a preamplifier 71 is connected to the hydrophone 41 for amplifying the electrical signal converted by the hydrophone 41. The preamplifier 207 refers to a circuit or an electronic device disposed between a source and an amplifier stage, and is designed to receive a weak voltage signal from the source.
The coupler 72 is adapted to the preamplifier 71 for supplying power to and signal coupling the preamplifier 71. Oscilloscope 73 is used to pick up the hydrophone signals on coupler 72 and display them in real time. At this time, the data processing feedback software can be used to pick up the hydrophone signals on the oscilloscope 73 in real time, and perform processing and feedback.
Here, the data processing feedback software may include a signal receiving module, a signal storage module, a signal display module, a first signal processing module, a second signal processing module, and a signal conversion module.
The signal receiving module may be configured to receive hydrophone electrical signals acquired by an oscilloscope, the signal storage module is configured to store electrical signals acquired (or received) by the signal receiving module and results obtained by processing the electrical signals, the signal display module is configured to visualize signals, the first signal processing module may directly arrange all the acquired electrical signals according to a spatial coordinate correspondence, and distinguish signal intensities in different colors, the results are visually output by the signal display module, the second signal processing module, on the basis of the first signal processing module, reserves results within a threshold in the results obtained by the first signal processing module as they are according to a set threshold (e.g., a focus offset threshold and a voltage peak-to-peak threshold), and removes or virtualizes results outside the threshold, to show the difference; the signal conversion module can convert the electric signal into an acoustic signal according to the acquired electric signal and the relationship between the sensitivity and the sound pressure intensity of the hydrophone, and the acoustic signal can also be subjected to operation which is equivalent to the electric signal by the signal storage module, the signal display module, the first signal processing module and the second signal processing module, which is not repeated herein.
Referring to fig. 1 and 2, the motion module 5 includes an X-axis 51, a Y-axis 52, and a Z-axis 53; a bracket 531 is arranged on the Z-axis 53, and the signal acquisition module 4 is adapted to be connected with the motion module 5 through the bracket 531. The X-axis 51, the Y-axis 52, and the Z-axis 53 may be motion mechanisms composed of guide rails, sliders, and cylinders, and the connection manner and the operation principle thereof are conventional technical means in the art, and are not described herein again.
Referring to fig. 1, according to some embodiments of the present invention, a motion module 5 may be disposed on the liquid couplant tank 1 for controlling the motion of the signal acquisition module 4 (e.g., the hydrophone 41), and by moving the hydrophone 41 so that the top of the hydrophone is aligned with the opening, the precise absolute position of the top of the hydrophone in the coordinate system of the ultrasonic transducer can be determined.
Referring to fig. 4, since the collimator 3 is customized to the ultrasound transducer 2, the bottom of the collimator 3 is configured to fit the ultrasound transducer 2, the position of the opening in the collimator 3 relative to the bottom of the collimator 3 is known, and when the bottom of the collimator 3 is assembled to the ultrasound transducer 2, the exact absolute position of the opening in the collimator 3 in the ultrasound transducer coordinate system is known, and the position of the hydrophone 4 installed at the opening can be obtained by controlling the movement of the hydrophone 41 by controlling the movement of the movement module 5 so that the top of the hydrophone coincides with the opening.
According to some embodiments of the present invention, the bracket 531 is formed with fixing locations, through which the hydrophone 41 is adapted to be connected to the bracket 531, the fixing locations may be, for example, fixing holes or the like, thereby facilitating the mounting of the hydrophone 41 on the bracket 531 through the fixing locations.
In some alternative embodiments of the present invention, the bracket 531 is configured as an L-shaped plate body, and the bracket 531 includes a vertical plate connected to the Z-axis 53 and a horizontal plate connected to the vertical plate, on which the fixing site is formed.
The invention is not limited thereto and in some embodiments of the invention, the hydrophone frame 202 may be constructed in other configurations, such as a rectangular plate, etc.
As shown in fig. 1, according to some embodiments of the present invention, the acoustic field measurement system 100 further includes a frame 8, a stage 81 is formed on the top of the frame 8, and the liquid couplant tank 1 is provided on the stage 81. For example, the operation table 81 may be formed on the top of the rack 8; the liquid couplant tank 1 may be provided on the operation table 81.
Referring to fig. 1, in some embodiments of the present invention, the liquid couplant is water, and the acoustic field measurement system 100 further comprises: a water treatment module 9, wherein the water treatment module 9 is used for ensuring that the oxygen content of the water in the liquid couplant tank 1 is not higher than 4ppm (0.004 thousandths).
Referring to fig. 2, the liquid couplant tank 1 may have a liquid inlet/outlet 11 formed thereon, and the liquid couplant can be easily injected and discharged through the liquid inlet/outlet 11. Since oxygen and air bubbles in water can affect the propagation path of ultrasonic waves and affect focusing and acoustic energy, the application can control the oxygen content of water in the liquid couplant tank 1 to be not higher than 4ppm through the water treatment module 9 by enabling the sound field measurement system 100 to comprise the water treatment module 9, thereby being beneficial to ensuring the treatment effect to a certain extent.
Referring to fig. 2, according to some embodiments of the present invention, the sound field measurement system 100 further includes: and a sound absorption material piece 10, wherein the sound absorption material piece 10 is arranged on the inner surface of the liquid couplant tank 1 to absorb sound waves. Therefore, the sound absorption material piece 10 is arranged on the inner surface of the liquid couplant groove 1, sound waves can be absorbed, the influence of reflected waves can be avoided, and the accuracy of sound field measurement can be improved.
Referring to fig. 6, a control method of a sound field measuring system according to an embodiment of a second aspect of the present invention, the control method using the sound field measuring system described above, includes the steps of: step S10: determining the accurate absolute position of the top of the signal acquisition module in the coordinate system of the ultrasonic transducer; step S20: setting the coordinates of the top of the signal acquisition module in the sound field measurement system coordinate system as the coordinates corresponding to the absolute position of the top of the signal acquisition module in the ultrasonic transducer coordinate system; namely, the coordinate system of the sound field measurement system is coincidently mapped to the coordinate system of the ultrasonic transducer; step S30: setting a regulation and control range of a primarily selected ultrasonic electronic focusing point to be detected according to the size of the ultrasonic transducer; step S40: setting discretely filled focuses in the regulation range of the primarily selected ultrasonic electronic focusing point to be detected; step S50: the ultrasonic transducer emits ultrasonic waves based on an ultrasonic transducer coordinate system and focuses the ultrasonic waves to a set focus, the signal acquisition module moves the top of the signal acquisition module to the position of the focus based on the ultrasonic transducer coordinate system, then a maximum peak value of received voltage is searched near the focus, and the maximum peak value and corresponding coordinates of the maximum peak value are recorded; step S60: the motion module controls the signal acquisition module to move, and the step S50 is repeated to traverse all the focuses; step S70: the data processing feedback software processes the measurement data recorded in the step S50 and the step S60 to obtain the focusing performance of the ultrasonic transducer.
Here, it should be noted that the collimator is installed on the ultrasound transducer, so as to determine the precise absolute position of the top of the signal acquisition module in the coordinate system of the ultrasound transducer, and the collimator is separated from the ultrasound transducer when the "moving module controls the signal acquisition module to move, and the step S50 is repeated to traverse all the focuses".
In step S30, the primarily selected measured ultrasonic electronic focus point has a large regulation range, and the bottom surface of the regulation range is at least larger than the surface of the ultrasonic transducer.
According to the control method of the sound field measurement system in the second aspect of the invention, the sound field measurement system in the first aspect of the invention is adopted, so that the accurate absolute position of the top of the signal acquisition module in the coordinate system of the ultrasonic transducer can be determined, and the accuracy of sound field measurement can be ensured. And the control method comprises a measurement feedback step, which is beneficial to the real-time feedback adjustment of the parameters of the ultrasonic transducer.
According to some embodiments of the invention, the signal acquisition module is a hydrophone, the clamping portion is an opening formed at a top of the collimator, and the step S10 includes: and controlling the movement of the hydrophone by controlling the movement of the motion module, so that the top of the hydrophone is aligned with the opening on the top of the collimator, and the top of the hydrophone is superposed with the opening to determine the accurate absolute position of the top of the hydrophone in the coordinate system of the ultrasonic transducer.
According to some embodiments of the invention, the step S30 includes: the transverse dimension is set as the maximum outline dimension of the ultrasonic transducer, and the longitudinal dimension is determined based on the thickness of the sagittal plane of human anatomy. The longitudinal dimension generally satisfying the HIFU treatment requirement is about 12-20 cm, and the transverse dimension and the longitudinal dimension may be adaptively set according to the need, which is not specifically limited in the present invention.
According to some embodiments of the present invention, the step S70 includes, based on the measurement data recorded in the steps S50 and S60, calculating by data processing feedback software to provide a focus offset distribution and a voltage peak-to-peak distribution of the ultrasonic transducer at each set focus point within the initially selected adjustment range of the measured ultrasonic electronic focus point, so that the focusing performance of the ultrasonic transducer can be conveniently and intuitively seen. Meanwhile, a focusing deviation threshold value and a voltage peak-to-peak value threshold value are preset in the data processing feedback software, and the data processing feedback software outlines the areas of the focusing deviation and the voltage peak-to-peak value within the threshold value range according to the focusing deviation threshold value and the voltage peak-to-peak value threshold value so as to obtain a focusing range based on the preset threshold value.
Referring to fig. 7 to 10, fig. 7 is a 3D schematic diagram of a primarily selected regulation range of an ultrasonic electronic focus point to be measured in the control method of the sound field measurement system according to the embodiment of the present invention; FIG. 8 is a 2D schematic top view of a primarily selected control range of an ultrasonic electronic focus point to be measured in a control method of a sound field measurement system according to an embodiment of the present invention; fig. 9 is a diagram illustrating a focus deviation (mm) of an actual focus measured by a hydrophone in a primarily selected focus range in the control method of the sound field measurement system according to the embodiment of the invention; fig. 10 shows a voltage peak-to-peak (millivolt: mV) value of an actual focal point measured by a hydrophone in a focusing range in the control method of the sound field measurement system according to the embodiment of the invention.
Of course, in some embodiments of the present invention, the user may also customize the focus offset threshold and the voltage peak-to-peak threshold, and the data processing feedback software may also outline the eligible focus range.
According to some embodiments of the invention, the focus bias threshold comprises a lateral bias threshold and a longitudinal bias threshold, the lateral bias threshold being no greater than (e.g., less than or equal to) 3mm, the longitudinal bias threshold being no greater than (e.g., less than or equal to) 5 mm; the voltage peak-to-peak value comprises a minimum voltage peak-to-peak value and a maximum voltage peak-to-peak value, and the voltage peak-to-peak value threshold value is 6dB or 3dB drop of the minimum voltage peak-to-peak value compared with the maximum voltage peak-to-peak value.
For example, in some alternative embodiments of the present invention, the lateral deviation threshold may be 1mm, 2mm, or 3mm, etc., and the longitudinal deviation threshold may be 1mm, 2mm, 3mm, 4mm, or 5mm, etc. The lateral deviation threshold value and the longitudinal deviation threshold value can be adaptively set according to actual needs.
For voltage or current, dB is 20 × lg (a/B), where a and B represent the values of power or current or voltage involved in the comparison, in the sense that dB is a short representation of a ratio of very large (followed by a long string of 0) or very small (followed by a long string of 0).
The invention provides a convenient method for measuring the full-electronic focus regulation range of a planar HIFU phased array transducer meeting the antenna theory. After the accurate absolute position of the top of the hydrophone in the coordinate system of the ultrasonic transducer is determined, the coordinates of the top of the hydrophone in the coordinate system of the sound field measurement system are set to be the coordinates corresponding to the absolute position of the top of the hydrophone in the coordinate system of the ultrasonic transducer, namely, the coordinate system of the sound field measurement system is coincidently mapped to the coordinate system of the ultrasonic transducer. According to the size of the ultrasonic transducer, a larger regulation range of the primarily selected ultrasonic electronic focus point to be measured is set, the transverse size is specifically set to be the size of the ultrasonic transducer, the longitudinal size is determined based on the thickness of the sagittal plane of human anatomy, and the longitudinal size generally meeting the requirements of HIFU treatment is about 12-20 cm. In the large range of the initial selection, a focus is set, and the area is filled in a discrete mode. The ultrasonic transducer emits ultrasonic waves based on a coordinate system of the ultrasonic transducer and focuses the ultrasonic waves to a set focus, the hydrophone moves the top of the hydrophone to the position of the focus based on the coordinate system of the ultrasonic transducer, then the maximum peak value of the received voltage is searched near the focus, and the maximum peak value and corresponding coordinates of the maximum peak value are recorded. All foci are traversed in the manner described above.
Based on the measurement data, the hydrophone data processing feedback software gives the focusing deviation distribution and the voltage peak-to-peak value distribution of the ultrasonic transducer on each set focus in the initially selected larger regulation range of the ultrasonic electronic focusing point to be measured through operation, so that the focusing performance of the ultrasonic transducer can be conveniently and visually seen. Meanwhile, the data processing feedback software presets a focusing deviation threshold and a voltage peak-to-peak value threshold, the data processing feedback software can draw out the focusing deviation and the voltage peak-to-peak value in the area of the threshold range according to the threshold, and a user can directly obtain the focusing range based on the preset threshold; of course, the user can also set the focus deviation threshold and the voltage peak-to-peak threshold by himself, and the hydrophone data processing feedback software will outline the focus range that meets the conditions.
Other constitutions and operations of the sound field measuring system 100 and the control method thereof according to the embodiment of the present invention are known to those skilled in the art and will not be described in detail herein.
The parts not referred to in the present invention are the same as or can be implemented using the prior art.
In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "transverse," "length," "width," "thickness," "upper," "lower," "front," "rear," "vertical," "horizontal," "top," "bottom," "inner," "outer," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings, which are simply for convenience of description and simplicity of description, and are not intended to indicate or imply that the device or element so referred to must have a particular orientation, be constructed and operated in a particular orientation, and are not to be construed as limiting the invention.
In the description of the present invention, "the first feature" and "the second feature" may include one or more of the features. In the description of the present invention, "a plurality" means two or more. In the description of the present invention, the first feature being "on" or "under" the second feature may include the first and second features being in direct contact, and may also include the first and second features being in contact with each other not directly but through another feature therebetween. In the description of the invention, "above", "over" and "above" a first feature in a second feature includes the first feature being directly above and obliquely above the second feature, or simply means that the first feature is higher in level than the second feature.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an illustrative embodiment," "an example," "a specific example," or "some examples" or the like mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
While embodiments of the invention have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.
Claims (10)
1. A sound field measurement system, comprising:
the liquid coupling agent tank is filled with a liquid coupling agent;
the ultrasonic transducer is a planar phased array transducer which meets the antenna theory, and is arranged in the liquid couplant groove;
the collimator is arranged in the direction in which the ultrasonic transducer emits ultrasonic waves, the bottom of the collimator is configured to be matched with the ultrasonic transducer, and a clamping part is arranged at the upper part of the collimator;
the signal acquisition module is used for picking up sound field signals and is matched with the clamping part;
the motion module is used for controlling the signal acquisition module to move in space;
the control module comprises data processing feedback software for picking up the signal of the signal acquisition module in real time, processing and feeding back the signal;
the control method of the sound field measurement system specifically comprises the following steps:
step S10: determining the accurate absolute position of the top of the signal acquisition module in the coordinate system of the ultrasonic transducer, which comprises the following steps:
the movement of the motion module is controlled to control the signal acquisition module to move, so that the top of the signal acquisition module is aligned to an opening on the collimator, and the top of the signal acquisition module is superposed with the opening to determine the accurate absolute position of the top of the signal acquisition module in the coordinate system of the ultrasonic transducer;
step S20: setting the coordinates of the top of the signal acquisition module in the sound field measurement system coordinate system as the coordinates corresponding to the absolute position of the top of the signal acquisition module in the ultrasonic transducer coordinate system;
step S30: setting a regulation and control range of a primarily selected ultrasonic electronic focusing point to be detected according to the size of the ultrasonic transducer;
step S40: setting discretely filled focuses in the regulation range of the primarily selected ultrasonic electronic focusing point to be detected;
step S50: the ultrasonic transducer emits ultrasonic waves based on an ultrasonic transducer coordinate system and focuses the ultrasonic waves to a set focus, the signal acquisition module moves the top of the signal acquisition module to the position of the focus based on the ultrasonic transducer coordinate system, then a maximum peak value of received voltage is searched near the focus, and the maximum peak value and corresponding coordinates of the maximum peak value are recorded;
step S60: the motion module controls the signal acquisition module to move, and the step S50 is repeated to traverse all the focuses, and in the process, the collimator is separated from the ultrasonic transducer;
step S70: the data processing feedback software processes the measurement data recorded in step S50 and step S60 to obtain the focusing performance of the ultrasonic transducer, specifically:
based on the measurement data, the data processing feedback software gives out focusing deviation distribution and voltage peak-to-peak value distribution of the ultrasonic transducer on each set focus in the primarily selected ultrasonic electronic focusing point regulation range through operation, the data processing feedback software presets a focusing deviation threshold value and a voltage peak-to-peak value threshold value, and the data processing feedback software outlines the focusing deviation and voltage peak-to-peak value in the threshold value range according to the focusing deviation threshold value and the voltage peak-to-peak value threshold value so as to obtain a focusing range based on the preset threshold value.
2. The sound field measurement system of claim 1, wherein the signal acquisition module is a hydrophone.
3. The sound field measurement system of claim 2, wherein the clamp is an aperture formed in the top of the collimator.
4. The sound field measurement system of claim 2, further comprising a signal processing module, the signal processing module comprising:
the preamplifier is connected with the hydrophone and is used for amplifying the electric signal converted by the hydrophone;
the coupler is matched with the preamplifier and used for supplying power to the preamplifier and performing signal coupling;
and the oscilloscope is used for picking up the hydrophone signals on the coupler and displaying the signals in real time.
5. The sound field measuring system according to claim 1, wherein the motion module comprises an X axis, a Y axis and a Z axis, a support is provided on the Z axis, and the signal acquisition module is adapted to be connected to the motion module through the support.
6. The sound field measuring system of claim 1, further comprising: the liquid couplant tank is arranged on the operating platform.
7. The acoustic field measurement system of claim 1, wherein the liquid couplant is water, the acoustic field measurement system further comprising:
a water treatment module for ensuring that the oxygen content of the water in the liquid couplant tank is not higher than 4 ppm.
8. The sound field measurement system according to any one of claims 1 to 7, characterized by further comprising:
and the sound absorption material piece is arranged on the inner surface of the liquid couplant groove to absorb sound waves.
9. The sound field measuring system according to claim 1, wherein the step S30 includes: the transverse dimension is set as the maximum outline dimension of the ultrasonic transducer, and the longitudinal dimension is determined based on the thickness of the sagittal plane of human anatomy.
10. The sound field measurement system of claim 1, wherein the focus bias threshold comprises a lateral bias threshold and a longitudinal bias threshold, the lateral bias threshold being no greater than 3mm, the longitudinal bias threshold being no greater than 5 mm; the voltage peak-to-peak value comprises a minimum voltage peak-to-peak value and a maximum voltage peak-to-peak value, and the voltage peak-to-peak value threshold value is 6dB or 3dB drop of the minimum voltage peak-to-peak value compared with the maximum voltage peak-to-peak value.
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