A Method of Ultrasonic CT Imaging Based on Spatial Coherence

Abstract

The invention discloses an ultrasonic CT imaging method based on space coherence. The method includes the following steps of firstly, collecting data to obtain original echo data; secondly, preprocessing the data; thirdly, meshing an imaging area; fourthly, conducting DMAS calculation treatment based on the space coherence for each meshed imaging point to obtain initial imaging signals of the meshed imaging points; fifthly, conducting data postprocessing to finally obtain an ultrasonic CT image. On the basis of the formation characteristics of virtual receiving signals in a filtering delay multiplication and superposition algorithm, by calculating the space coherence of any two signals of the virtual receiving signals in the filtering delay multiplication and superposition algorithm and weighting the virtual received signals, compared with the prior art, the problems of a zero-phase filtering delay multiplication and superposition algorithm applied in the ultrasonic CT reflection imaging field can be effectively solved, and a high-contrast high-noise-ratio and low-sidelobe-level ultrasonic CT image can be reestablished.

Description

technical field

[0001] The invention belongs to the technical field of ultrasonic tomography, and more particularly relates to an ultrasonic CT imaging method based on spatial coherence. Background technique

[0002] Ultrasound CT imaging, that is, ultrasonic tomography, has the advantages of high resolution, 360° omnidirectional scanning, no extrusion, no radiation, and low cost. It has important clinical value and application prospects in breast cancer screening and early diagnosis.

[0003] Ultrasound CT imaging methods include reflection imaging, sound velocity imaging and attenuation imaging. Reflection imaging depicts the anatomical structure of the target, and sound velocity and attenuation imaging shows the functional changes of the target. The three complement each other and are indispensable.

[0004] The Computed ultrasound risk evaluation system (Computed ultrasound risk evaluation, CURE) developed by the Karmanos Cancer Center in the United States can reconstru...

Examples

Embodiment 1

[0043] In the ultrasonic CT imaging method based on spatial coherence in the present invention, its steps include data acquisition, data preprocessing, gridding of the imaging area, and calculating each Values ​​at imaging points, zero-phase bandpass filtering, image display steps.

[0044] (1) Data acquisition: The array elements of the annular array are evenly distributed on the ring. When an array element emits an ultrasonic signal, all array elements (including the transmitting array element itself that transmits the signal) are responsible for receiving the signal. Each array element is transmitted once in a cycle, and the direction can be clockwise or counterclockwise. In addition, all array elements can be numbered clockwise or counterclockwise, and the array element numbers are 1, 2, 3, ... N in sequence, and N is the total number of array elements.

[0045] (2) Data preprocessing: filter the signal collected in step 1 to filter out some interference signals. This sy...

technical field

[0001] The invention belongs to the technical field of ultrasonic tomography, and more particularly relates to an ultrasonic CT imaging method based on spatial coherence. Background technique

[0002] Ultrasound CT imaging, that is, ultrasonic tomography, has the advantages of high resolution, 360° omnidirectional scanning, no extrusion, no radiation, and low cost. It has important clinical value and application prospects in breast cancer screening and early diagnosis.

[0003] Ultrasound CT imaging methods include reflection imaging, sound velocity imaging and attenuation imaging. Reflection imaging depicts the anatomical structure of the target, and sound velocity and attenuation imaging shows the functional changes of the target. The three complement each other and are indispensable.

[0004] The Computed ultrasound risk evaluation system (Computed ultrasound risk evaluation, CURE) developed by the Karmanos Cancer Center in the United States can reconstru...

Examples

Embodiment 1

[0043] In the ultrasonic CT imaging method based on spatial coherence in the present invention, its steps include data acquisition, data preprocessing, gridding of the imaging area, and calculating each Values ​​at imaging points, zero-phase bandpass filtering, image display steps.

[0044] (1) Data acquisition: The array elements of the annular array are evenly distributed on the ring. When an array element emits an ultrasonic signal, all array elements (including the transmitting array element itself that transmits the signal) are responsible for receiving the signal. Each array element is transmitted once in a cycle, and the direction can be clockwise or counterclockwise. In addition, all array elements can be numbered clockwise or counterclockwise, and the array element numbers are 1, 2, 3, ... N in sequence, and N is the total number of array elements.

[0045] (2) Data preprocessing: filter the signal collected in step 1 to filter out some interference signals. This sy...

Images