CN-122004928-A - Imaging method and system for patch ultrasound

CN122004928ACN 122004928 ACN122004928 ACN 122004928ACN-122004928-A

Abstract

The invention provides an imaging method and system for patch ultrasound, comprising a delay calculation step, a beam receiving and transmitting step, a data acquisition step and an imaging generation step, wherein the delay calculation step is used for calculating the emission delay of each array element of a phased array transducer in advance according to the type and deflection parameters of a target beam and providing a time sequence reference for beam emission, the beam receiving and transmitting step is used for emitting beams in a multi-channel excitation mode through the array elements of the phased array transducer based on the emission delay and receiving echo signals through all the array elements, the data acquisition step is used for determining the total receiving and transmitting times and acquiring echo data according to the deflection parameters in the beam receiving and transmitting step, and the imaging generation step is used for carrying out signal processing by utilizing the echo data and generating a dynamic monitoring image of a target area. The invention can ensure that the whole imaging view has no view blind area, can clearly present local details, has better transverse or axial resolution and contrast than a single wave beam imaging scheme, and meets the monitoring requirements of superficial tissue microstructure and blood flow change condition.

Inventors

LAN ZHENGFENG
CHEN CHAO

Assignees

杭州荷声科技有限公司

Dates

Publication Date: 20260512
Application Date: 20251230

Claims (10)

1. An imaging method for patch ultrasound, comprising: A delay calculation step, namely, according to the type and deflection parameters of the target beam, calculating the transmission delay of each array element of the phased array transducer in advance, and providing a time sequence reference for beam transmission; transmitting and receiving the wave beam in a multichannel excitation mode through array elements of the phased array transducer based on the transmission delay, and receiving echo signals through all the array elements; a data acquisition step, namely determining total transceiving times and acquiring echo data according to the deflection parameters in the beam transceiving step; And an imaging generation step of performing signal processing by using the echo data to generate a dynamic monitoring image of the target area.
2. The imaging method for patch ultrasound of claim 1, wherein the phased array transducer comprises a plurality of array elements arranged in a linear arrangement; When transmitting the wave beam, exciting all array elements positioned on the linear array or partial array elements near two sides; In echo reception, echo signals are received by all array elements.
3. The imaging method for patch ultrasound according to claim 1, wherein the delay calculation step includes: A parameter determining step of dividing an imaging view field into a middle area and two side areas, transmitting deflection plane waves to the middle area, and transmitting deflection focusing waves to the two side areas; A model selection step, namely selecting a plane wave calculation model for the middle region and selecting a focus convergence model for the two side regions; and a delay generation step, namely calculating the emission delay of each array element emitted by the plane wave according to the plane wave calculation model, and calculating the emission delay of each array element emitted by the focused wave in the areas at two sides according to the focus convergence model, so as to integrate and form a delay table covering the whole imaging field of view.
4. The imaging method for patch ultrasound of claim 3, wherein the beam transceiving step comprises: A transmitting preparation step, namely configuring multi-channel excited array elements according to the delay table, and setting echo receiving time sequences of plane waves and focused waves; A subarea transmitting step, based on the delay table, firstly controlling all array elements to transmit plane waves covering the middle area according to plane wave delay, and respectively controlling array element groups at two sides to transmit focused waves covering the areas at two sides according to focused wave delay, so as to realize beam coverage of the whole imaging view; and a global receiving step, namely receiving echo signals through all array elements according to the receiving time sequence and amplifying the signals.
5. The imaging method for patch ultrasound of claim 1, wherein the data acquisition step comprises: A parameter configuration step, namely determining the total receiving and transmitting event times, sampling frequency and data storage format according to the deflection parameters, and taking the total receiving and transmitting event times, sampling frequency and data storage format as an execution standard of acquisition; A data acquisition step, namely performing digital conversion on the received echo signals to generate digital signals, and synchronously recording the emission lag time to mark the data time sequence; And a data integration step, based on the digital signals, dimension integration is carried out according to the receiving time, the receiving channel serial number and the transmitting times, and structured data is formed and temporarily stored.
6. The imaging method for patch ultrasound of claim 5, wherein the imaging generating step comprises the substeps of: A data preprocessing step of filtering the structured data to eliminate noise and enhance effective signals; a mode processing step, namely performing corresponding imaging processing on the preprocessed data according to a target imaging mode; And an image generation step, converting the processed data into a visual image, and splicing the visual image into a dynamic monitoring image of the target area according to time sequence.
7. The imaging method for patch ultrasound according to claim 3, wherein in the delay calculation step, the deflection parameter of the plane wave is initially set to a deflection angle within [ -30 °,30 ° ] with an angular interval of 1 to 2 °; The deflection parameters of the focused wave are initially set to deflection angles within [ -45 °, -30 ° ] and [30 °,45 ° ], with an angular interval of 1 to 2 °.
8. The imaging method for patch ultrasound according to claim 6, wherein in the mode processing step, if a focused wave is adopted in the color doppler ultrasound imaging, a plurality of deflection angles are selected to cover a blood flow region, each deflection angle is repeatedly transmitted a plurality of times, and a blood flow distribution image is generated through doppler shift analysis; If plane waves are adopted, the deflection angle is fixed, the transmission is repeated for a plurality of times, and a blood flow distribution image is generated through Doppler frequency shift analysis.
9. The imaging method for patch ultrasound according to claim 6, wherein in the mode processing step, when pulse wave doppler ultrasound imaging is adapted, the B-mode and color doppler ultrasound are frozen, and focused waves at a single deflection angle are repeatedly transmitted thousands to tens of thousands of times to satisfy a 3-5 second cardiac cycle observation.
10. An imaging system for patch ultrasound, comprising: The delay calculation module is used for pre-calculating the transmission delay of each array element of the phased array transducer according to the type and deflection parameters of the target beam and providing a time sequence reference for beam transmission; the wave beam receiving and transmitting module is used for transmitting wave beams in a multichannel excitation mode through array elements of the phased array transducer based on the transmission delay and receiving echo signals through all the array elements; the data acquisition module is used for determining the total receiving and transmitting times and acquiring echo data according to the deflection parameters; and the imaging generation module is used for performing signal processing by using the echo data to generate a dynamic monitoring image of the target area.

Description

Imaging method and system for patch ultrasound Technical Field The invention relates to an ultrasonic chip, in particular to an imaging method and system for patch ultrasound. Background The working principle of the transducer is based on the positive and reverse piezoelectric effect of the piezoelectric material, and the piezoelectric film periodically vibrates to achieve efficient transmission and reception of ultrasonic signals. When the transducer is used as a transmitting end, the actuator is used for converting an electric signal into mechanical vibration energy, the piezoelectric film deforms due to the inverse piezoelectric effect under the action of driving voltage, ultrasonic waves are radiated to a medium, and when the transducer is used as a receiving end, the transducer is used as a sensor for capturing the mechanical vibration energy, the external ultrasonic waves enable the piezoelectric film to vibrate, and acoustic signals are converted into the electric signal through the positive piezoelectric effect for subsequent processing. Complementary metal oxide semiconductor (Complementary Metal Oxide Semiconductor, CMOS) technology is used as a core technology in the semiconductor field and is widely used in various fields such as integrated circuit fabrication. The transistor can integrate a large number of transistors into a small chip, continuously develop according to moore's law, and promote the semiconductor to be miniaturized and evolved with high performance. In an ultrasonic imaging system, a CMOS integrated circuit can accurately control an excitation signal of an ultrasonic transducer at a transmitting end. For example, an electrical pulse signal of a particular frequency, pulse width and amplitude can be generated to drive the ultrasonic transducer to emit ultrasonic waves. Like some medical ultrasonic diagnostic equipment, the emission waveform is optimized through the CMOS integrated circuit emission circuit, the emission efficiency and directivity of ultrasonic waves are improved, and the resolution and definition of imaging are further improved. The CMOS integrated circuit at the receiving end is responsible for receiving echo signals received by the ultrasonic transducer and carrying out preprocessing such as pre-amplification, filtering and the like. The CMOS integrated circuit can integrate a high-performance low-noise amplifier, reduce noise interference of received signals, and simultaneously process echo signals with different frequencies and amplitudes rapidly and accurately, so as to provide high-quality data for subsequent signal processing and image reconstruction. Medical imaging technology is undergoing a profound paradigm shift. Although the traditional large-scale ultrasonic equipment has powerful functions, the traditional large-scale ultrasonic equipment is limited by volume, cost and operation threshold, the application scene is mainly concentrated in a hospital department, and the wide clinical requirements of outside hospitals, bedside, dynamics and timeliness are difficult to meet. Patch ultrasound is a key driving force in this changing wave as an emerging wearable, portable, continuously monitored medical imaging technology. It is not only a supplement to the traditional ultrasound technology, but also opens a strategic portal for global health monitoring. Disclosure of Invention In view of the problems in the prior art, it is an object of the present invention to provide an imaging method and system for patch ultrasound. The imaging method for patch ultrasound provided by the invention comprises the following steps: A delay calculation step, namely, according to the type and deflection parameters of the target beam, calculating the transmission delay of each array element of the phased array transducer in advance, and providing a time sequence reference for beam transmission; transmitting and receiving the wave beam in a multichannel excitation mode through array elements of the phased array transducer based on the transmission delay, and receiving echo signals through all the array elements; a data acquisition step, namely determining total transceiving times and acquiring echo data according to the deflection parameters in the beam transceiving step; And an imaging generation step of performing signal processing by using the echo data to generate a dynamic monitoring image of the target area. Preferably, the phased array transducer comprises a plurality of array elements arranged in a linear manner; When transmitting the wave beam, exciting all array elements positioned on the linear array or partial array elements near two sides; In echo reception, echo signals are received by all array elements. Preferably, the delay calculating step includes: a parameter determining step of dividing an imaging view field into a middle area and two side areas, transmitting deflection plane waves to the middle area, and transmitting deflection focusing waves to the two si