Wireless sector ultrasonic scanning method

Abstract

The invention discloses a wireless sector ultrasonic scanning method, and relates to the technical field of veterinary ultrasonic diagnos.The wireless sector ultrasonic scanning method monitors contact pressure distribution of a probe and the body surface in real time through a three-dimensional pressure sensor array, a sound velocity correction model is constructed according to the contact pressure distribution, and the imaging precision under the complex body surface form is improved; ultrasonic radio frequency data and motion data are synchronously processed through millimeter wave dual-channel wireless transmission, in combination with motion speed self-adaptive frame rate regulation and control, the transmission load is greatly reduced while the image continuity is guaranteed, the coupling agent release is regulated and controlled by the integrated micro-fluidic unit in a partitioned manner, the acoustic coupling effect is effectively optimized, waste is reduced, and the sound quality is improved. The problems that a traditional wired probe is poor in body surface adaptability, low in data transmission efficiency and unreasonable in coupling agent dosage are solved, the system is suitable for dynamic detection scenes of animal medical treatment, and a convenient and efficient solution is provided for pet health management.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of veterinary ultrasonic diagnosis technology, in particular to a wireless sector scanning method. BACKGROUND

[0002] In veterinary image diagnosis, a wireless sector scanning probe is usually used for daily health examination and disease screening of pets. This technology combines wireless transmission and sector imaging mode, and the device is small and portable. The terminal can display images in real time, obtain clear images of the pet's abdomen, heart, urinary system and other parts, improve the speed and accuracy of diagnosis, and is suitable for clinical and on-site service use, providing a convenient and efficient solution for pet health management.

[0003] However, the traditional wired ultrasonic probe has significant limitations in animal diagnosis and treatment. The animal body surface is often covered with hair and has a complex shape. The uneven contact pressure of the probe leads to a deviation in sound speed calculation, and the imaging is prone to distortion. In addition, the data transmission bandwidth is insufficient, making it difficult to synchronize high frame rate ultrasonic data and motion information. When moving quickly, image tomography is prone to occur. In the scanning process, the coupling agent relies on manual application, which is prone to local poor coupling or waste. Therefore, there is an urgent need for a wireless scanning method that integrates dynamic sound speed correction, adaptive data transmission and intelligent coupling regulation to improve the accuracy and flexibility of animal ultrasonic detection. SUMMARY

[0004] The purpose of the present application is to provide a wireless sector scanning method to solve the problems raised in the background art.

[0005] To achieve the above purpose, the present application provides the following technical solution: a wireless sector scanning method, comprising the following steps:

[0006] S1, real-time acquisition of contact pressure distribution data of the probe and the pet body surface by a three-dimensional pressure sensor array in the ultrasonic wireless probe;

[0007] S2, constructing a sound speed correction model based on the pressure distribution data, and dynamically adjusting the sound speed parameter in the ultrasonic propagation path calculation;

[0008] S3, synchronously transmitting ultrasonic radio frequency signals and probe motion data collected by an inertial measurement unit through a millimeter wave wireless transmission module;

[0009] S4, dynamically adjusting the scanning frame rate according to the probe motion data, using adjacent frame interpolation imaging when the motion speed is > 5mm / s, enabling adaptive frame loss compression when the motion speed is < 2mm / s, and outputting the corrected image;

[0010] S5, generating a coupling agent regulation instruction based on the pressure distribution, and controlling the release amount of the coupling agent by a microfluidic unit in the probe.

[0011] Preferably, in S1, the pressure sensor array in the ultrasonic wireless probe is distributed along the three-axis space of the inner wall of the probe shell with a 5x5mm grid density, and the sampling frequency is ≥100Hz.

[0012] Preferably, in S2, the sound velocity correction model construction process includes:

[0013] S21, dividing the pressure distribution into 5x5mm grid units;

[0014] S22, using a sound velocity correction coefficient of 1.05-1.08 for high pressure areas (>15kPa);

[0015] S23, using a sound velocity correction coefficient of 0.92-0.95 for low pressure areas (<5kPa);

[0016] S24, calculating the sound wave refraction path by finite element iteration.

[0017] Preferably, in S3, the millimeter wave wireless transmission adopts a dual-channel architecture:

[0018] The first channel transmits the ultrasonic radio frequency data after beam synthesis, using LDPC encoding and QPSK modulation;

[0019] The second channel transmits the three-axis acceleration and three-axis angular velocity data of the inertial measurement unit, using differential pulse encoding modulation;

[0020] The dual channels are synchronously transmitted in the 60GHz frequency band through time division duplexing.

[0021] Preferably, in S4, adjacent frame interpolation imaging is performed by extracting feature point trajectories in the motion direction, using a bicubic interpolation algorithm to reconstruct the intermediate frame, and applying motion adaptive filtering to the interpolated frame, with the filter kernel function being:

[0022]

[0023] Where v is the real-time motion speed, and the kernel center coefficient 5+0.2v realizes speed-adaptive sharpening enhancement, with v<2mm / s at low speed to maintain basic sharpening (coefficient ≈5), and v=10mm / s at high speed to strengthen to a coefficient of 7 to suppress motion blur.

[0024] Preferably, in S4, the adaptive frame loss compression includes constructing a frame importance scoring model:

[0025]

[0026] Frames with a score below the threshold value of 0.7 are discarded, and the remaining frames are compressed using H.265 encoding, with a compression ratio of no less than 8:1.

[0027] Preferably, in S5, the control process of the coupling agent includes:

[0028] S51, 16 independently controlled microfluidic units are arranged on the probe surface;

[0029] S52, a coupling agent release matrix is generated according to the pressure distribution thermogram;

[0030] S53, quantitative release by piezoelectric micropump.

[0031] Preferably, in S3, the ultrasonic signal is transmitted by 5G NR protocol with a bandwidth ≥100MHz, and the motion data is transmitted by Bluetooth BLE protocol with a delay <10ms.

[0032] Preferably, in S4, the probe motion data is used for dynamic calibration of the ultrasonic imaging coordinate system, specifically including:

[0033] S41, according to the three-axis angular velocity data collected by the inertial measurement unit, the probe deflection angle θ is calculated in real time;

[0034] S42, when θ>3°, coordinate system rotation compensation is triggered, and the coordinate system rotation compensation formula is:

[0035]

[0036] Update the scanning plane spatial coordinates, update the scanning plane spatial coordinates;

[0037] S43, map the compensated coordinates to the ultrasonic radio frequency data to generate an ultrasonic image corrected in posture.

[0038] Preferably, in S5, the microfluidic unit is 0.05ml / cm 2 Standard partition releases coupling agent, and continuously triggers vibration alarm for high pressure area >20kPa.

[0039] Compared with the prior art, the beneficial effects of the present application are: the present application monitors the contact pressure distribution of the probe and the body surface in real time through a three-dimensional pressure sensor array, and constructs a sound velocity correction model accordingly, which improves the imaging accuracy under complex body surface morphology, uses millimeter wave double-channel wireless transmission to synchronously process ultrasonic radio frequency data and motion data, combines motion speed adaptive frame rate regulation, while ensuring image continuity, greatly reduces transmission load, integrates microfluidic unit partition control coupling agent release, effectively optimizes sound coupling effect and reduces waste, solves the problems of poor body surface adaptability of traditional wired probe, low data transmission efficiency and unreasonable coupling agent consumption, and is suitable for dynamic detection scene of animal medical treatment. BRIEF DESCRIPTION OF DRAWINGS

[0040] Fig. 1 Flowchart of wireless fan scanning ultrasonic scanning method of embodiments of the present application;

[0041] Fig. 2 Flow chart for motion compensation in the wireless fan scanning ultrasonic scanning method of the embodiments of the present application. DETAILED DESCRIPTION

[0042] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0043] Please refer to Figs. 1-2 The embodiments of the present application provide a wireless fan scanning ultrasonic scanning method, which comprises the following steps:

[0044] S1, real-time acquisition of contact pressure distribution data of a probe and a pet body surface by a three-dimensional pressure sensor array in an ultrasonic wireless probe, wherein the single size of the pressure sensor in the ultrasonic wireless probe is 3mm×3mm×0.5mm, and the specific layout is that 8 sensing points are arranged in the X-axis direction, 8 sensing points are arranged in the Y-axis direction, and 4 sensing points are arranged in the Z-axis direction, forming a three-dimensional detection matrix with a 5×5mm grid density, so that the detection area reaches 40mm×40mm, covering the core area of the contact between the probe and the body surface, and the sampling frequency is ≥100Hz.

[0045] S2, construction of a sound velocity correction model based on the pressure distribution data, dynamic adjustment of the sound velocity parameter in the ultrasonic propagation path calculation, and the construction process of the sound velocity correction model comprises:

[0046] S21, division of the pressure distribution into 5×5mm grid units;

[0047] S22, use of a sound velocity correction coefficient of 1.05-1.08 for the high pressure area (>15kPa);

[0048] S23, use of a sound velocity correction coefficient of 0.92-0.95 for the low pressure area (<5kPa);

[0049] S24, calculation of the sound wave refraction path by finite element iteration, and the specific implementation comprises:

[0050] Based on the 5x5mm grid units divided in S21, the pressure data is mapped into a three-dimensional sound velocity field, the sound velocity in the high pressure area of >15kPa is corrected by 1.05-1.08 times the reference value, and the sound velocity in the low pressure area of <5kPa is corrected by 0.92-0.95 times the reference value;

[0051] A tetrahedral unit discrete organization model is used, the grid size in the shallow layer (depth <20mm) is ≤0.5mm, and the grid size in the deep layer is ≤2mm.

[0052] Solve the time-domain acoustic wave equation:

[0053]

[0054] Where c(r) is the space-dependent speed of sound, and p(r,t) is the sound pressure field, representing the sound pressure fluctuation at a point r in the medium at time t. For the Laplace operator, The second derivative of time is used, the sound source boundary is set on the probe surface, and the sound pressure continuity condition is set at the tissue interface;

[0055] Gradient Iteration Path Correction: Initialize the straight path and calculate the sound path time. Among them, T c Let ds represent the sound path time, ds be a tiny line segment element on the propagation path, and c(s) be the sound velocity at position s on the sound wave propagation path.

[0056] Compare with the measured echo time T m The calculation error ΔT = T m -T c Where ΔT is the time error, T m This is the measured echo time;

[0057] according to Update the path (α = 0.1 - 0.3), where Δr k This represents the path correction amount at the k-th iteration, used to update the sound propagation path. α is the step size factor, r is the spatial coordinate vector, and c is the speed of sound. Let the speed of sound c be the coordinate vector r in space. k The gradient at r k It is the spatial coordinate vector at the k-th iteration, and the gradient. It reflects the rate and direction of change of sound speed in space, and can reasonably correct the propagation path based on the spatial distribution characteristics of sound speed. The output is terminated when |ΔT|<0.1μs or after 10 iterations.

[0058] In this embodiment, the selection of correction coefficients in S22 and S23 is based on 100 sets of experimental data on ultrasonic propagation in animal tissues. The experimental subjects included dogs, cats, and rabbits. The ultrasonic velocity values ​​under different pressures were measured (using the pulse-echo method, with the reference standard being the soft tissue sound velocity of 1540 m / s). The experimental results are shown in Table 1.

[0059]

[0060] Referring to Table 1, in the above data, the correction factor for the high-pressure area >15kPa is 1.05-1.08 (covering the 95% confidence interval), the correction factor for the low-pressure area <5kPa is 0.92-0.95, and the intermediate area of ​​5-15kPa does not require correction.

[0061] S3, synchronously transmitting the ultrasonic radio frequency signal and the probe motion data collected by the inertial measurement unit (IMU) through the millimeter wave wireless transmission module, wherein the millimeter wave wireless transmission adopts a dual-channel architecture:

[0062] The first channel transmits the ultrasonic radio frequency data after beam synthesis, adopts LDPC encoding and QPSK modulation;

[0063] The second channel transmits the three-axis acceleration and three-axis angular velocity data of the inertial measurement unit, adopts differential pulse encoding modulation;

[0064] The dual channels are synchronously transmitted in the 60GHz frequency band through time division duplexing.

[0065] Further, the ultrasonic signal is transmitted by using the 5GNR protocol with a bandwidth of ≥100MHz, and the motion data is transmitted by using the Bluetooth BLE protocol with a delay of <10ms.

[0066] In another embodiment, the collected pressure data is packaged in a 16-bit integer format, each frame of data contains the pressure values of 64 sensing points, a 1ms timestamp, a temperature value and a checksum, the total length is 136 bytes, and the data is transmitted to the cache area of the millimeter wave wireless transmission module through the SPI interface, and the transmission rate is 10Mbps.

[0067] S4, dynamically adjusting the scanning frame rate according to the probe motion data, using adjacent frame interpolation imaging when the motion speed is >5mm / s, and enabling adaptive frame loss compression when the motion speed is <2mm / s, the adjacent frame interpolation imaging is realized by extracting feature point trajectories in the motion direction, using a bicubic interpolation algorithm to reconstruct the intermediate frame, and applying motion adaptive filtering to the interpolated frame, and the filter kernel function is:

[0068]

[0069] Wherein, v is the real-time motion speed, the kernel center coefficient 5+0.2v realizes the sharpening enhancement adaptive to the speed, when the speed is low, v<2mm / s, the basic sharpening is maintained (coefficient ≈5), when the speed is high, v=10mm / s, the motion blur is suppressed by strengthening to the coefficient 7.

[0070] The adaptive frame loss compression includes constructing a frame importance scoring model:

[0071]

[0072] Frames with a discard score lower than a threshold value of 0.7 are discarded, and the remaining frames are compressed by using H.265 encoding, and the compression ratio is not less than 8:1.

[0073] According to the above embodiment, in the S4, the probe motion data is used for dynamically calibrating the ultrasonic imaging coordinate system, specifically including:

[0074] S41, calculating the probe deflection angle θ in real time according to the three-axis angular velocity data collected by the inertial measurement unit;

[0075] S42, triggering coordinate system rotation compensation when θ>3°, and the coordinate system rotation compensation formula is:

[0076]

[0077] updating the scanning plane space coordinates;

[0078] S43, mapping the compensated coordinates to the ultrasonic radio frequency data to generate an ultrasonic image corrected in posture.

[0079] S5, generating a coupling agent adjustment instruction based on the pressure distribution, controlling the release amount of the coupling agent through a microfluidic unit built in the probe, and the control process of the coupling agent comprises:

[0080] S51, setting 16 independently controlled microfluidic units on the surface of the probe;

[0081] S52, generating a coupling agent release matrix according to the pressure distribution thermodynamic map;

[0082] S53, quantitatively releasing through a piezoelectric micropump.

[0083] Further, in the S5, the microfluidic unit releases the coupling agent at 0.05ml / cm 2 The standard partition releases the coupling agent, when the pressure value is greater than 15kPa, the corresponding area coupling agent release is reduced to 50%-70% of the reference amount, when the pressure value is less than 5kPa, the corresponding area coupling agent release is increased to 130%-150% of the reference amount, and the high pressure area greater than 20kPa is continuously triggered to vibrate the alarm, the terminal screen displays a red pressure warning box, accompanied by a beeping sound.

[0084] Coupling agent adjustment effect verification: comparative experiments were conducted in the abdominal ultrasound examination of dogs, and artificial smearing and the automatic adjustment system of the application were used respectively, and the results are shown in Table 2:

[0085] Evaluation index Manual application Automatic adjustment system Improvement rate Coupling failure rate 15±5％ 3±2％ 80％ Coupling agent amount (ml) 5.2±1.3 2.8±0.8 46.2％ Inspection time (min) 8.5±1.2 6.2±0.9 27.1％

[0086] Referring to Table 2, the experiments show that the automatic adjustment system can significantly reduce the coupling failure rate, reduce the coupling agent consumption, and shorten the examination time.

[0087] In summary: the wireless sector scanning ultrasonic scanning method of the application solves the imaging distortion problem caused by the complex shape of the pet body surface by capturing the contact pressure distribution in real time through a three-dimensional pressure sensing array, dynamically adjusting the sound velocity parameter combined with the sound velocity correction model, and improving the image accuracy.

[0088] Millimeter wave double-channel transmission and motion adaptive frame rate control, while ensuring data synchronization, effectively balances transmission load and image continuity, and avoids the phenomenon of broken layers when moving quickly.

[0089] The microfluidic unit partitions control the coupling agent release, greatly reduces the coupling failure rate, reduces the dosage and shortens the inspection time, and provides an efficient, accurate and convenient solution for veterinary diagnosis and treatment.

[0090] The above of the present application is only an embodiment of the present application, and the common knowledge of the specific structure and characteristics in the scheme of the present application is not described in detail, the ordinary skilled in the art knows all the ordinary technical knowledge in the field of the present application before the application date or the priority date, can know all the prior art in the field, and has the ability to apply the conventional experimental means before the date, the ordinary skilled in the art can improve and implement the scheme under the inspiration given by the present application, some typical known structures or known methods should not be an obstacle for the ordinary skilled in the art to implement the present application. It should be pointed out that, for those skilled in the art, without departing from the structure of the present application, a number of modifications and improvements can be made, which should be considered as the protection scope of the present application, which will not affect the effect and practicality of the patent.

Claims

1. A wireless sector-scan ultrasonic scanning method, characterized by, The method comprises the following steps: S1, real-time acquisition of contact pressure distribution data of the probe and the pet body surface by a three-dimensional pressure sensor array in the ultrasonic wireless probe; S2, constructing a sound velocity correction model based on the pressure distribution data, and dynamically adjusting the sound velocity parameter in the ultrasonic propagation path calculation; S3, synchronously transmitting the ultrasonic radio frequency signal and the probe motion data collected by the inertial measurement unit through the millimeter wave wireless transmission module; S4, dynamically adjusting the scanning frame rate according to the probe motion data, using adjacent frame interpolation imaging when the motion speed is greater than 5 mm / s, enabling adaptive frame loss compression when the motion speed is less than 2 mm / s, and outputting the corrected image; S5, generating a coupling agent adjustment instruction based on the pressure distribution, and controlling the release amount of the coupling agent through the microfluidic unit in the probe.

2. The wireless fan-scan ultrasound scanning method of claim 1, wherein: In S1, the pressure sensor array in the ultrasonic wireless probe is distributed along the three-axis space of the inner wall of the probe shell with a 5*5 mm grid density, and the sampling frequency is greater than or equal to 100 Hz.

3. The wireless fan-scan ultrasound scanning method of claim 1, wherein: In S2, the sound velocity correction model construction process comprises: S21, dividing the pressure distribution into 5*5 mm grid units; S22, using a sound velocity correction coefficient of 1.05-1.08 for high-pressure areas (>15kPa); S23, using a sound velocity correction coefficient of 0.92-0.95 for low-pressure areas (<5kPa); S24, calculating the sound wave refraction path through finite element iteration.

4. The wireless fan-scan ultrasound scanning method of claim 1, wherein: In S3, the millimeter wave wireless transmission adopts a dual-channel architecture: The first channel transmits the ultrasonic radio frequency data after beam synthesis, using LDPC encoding and QPSK modulation; The second channel transmits the three-axis acceleration and three-axis angular velocity data of the inertial measurement unit, using differential pulse encoding modulation; The dual-channel synchronously transmits through time division duplexing in the 60GHz frequency band.

5. The wireless fan-scan ultrasound scanning method of claim 1, wherein: In S4, adjacent frame interpolation imaging is achieved by extracting feature point trajectories in the motion direction, using a bicubic interpolation algorithm to reconstruct the intermediate frame, and applying motion adaptive filtering to the interpolated frame, with the filter kernel function being: Where v is the real-time motion speed, and the kernel center coefficient 5+0.2v realizes speed-adaptive sharpening enhancement, with the basic sharpening maintained (coefficient ≈ 5) at low speed v<2mm / s, and the coefficient strengthened to 7 to suppress motion blur at high speed v=10mm / s.

6. The wireless fan-scan ultrasound scanning method of claim 1, wherein: In S4, the adaptive frame loss compression comprises constructing a frame importance scoring model: Frames with a score lower than the threshold value 0.7 are discarded, and the remaining frames are compressed using H.265 encoding, with a compression ratio not less than 8:

1.

7. The wireless fan-scan ultrasound scanning method of claim 1, wherein: In S5, the control process of the coupling agent comprises: S51, setting 16 independently controlled microfluidic units on the surface of the probe; S52, generating a coupling agent release matrix according to the pressure distribution thermogram; S53, quantitatively releasing through a piezoelectric micropump.

8. The wireless fan-scan ultrasound scanning method of claim 1, wherein: In S3, the ultrasonic signal is transmitted using a 5GNR protocol with a bandwidth of ≥100MHz, and the motion data is transmitted using a Bluetooth BLE protocol with a delay of <10ms.

9. The wireless fan-scan ultrasound scanning method of claim 1, wherein: In S4, the probe motion data is used to dynamically calibrate the ultrasonic imaging coordinate system, specifically comprising: S41, calculating the probe deflection angle θ in real time according to the three-axis angular velocity data collected by the inertial measurement unit; S42, when θ>3°, trigger coordinate system rotation compensation, and the coordinate system rotation compensation formula is: Update the scanning plane space coordinates, update the scanning plane space coordinates; S43, map the compensated coordinates to the ultrasonic radio frequency data to generate an attitude corrected ultrasonic image.

10. The wireless fan-scan ultrasound scanning method of claim 4, wherein: In S5, the microfluidic unit is pressed at 0.05 ml / cm 2 The standard partition releases the coupling agent and triggers a vibration alarm continuously for high pressure areas > 20 kPa.

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