Ultrasonic dynamic receiving apodization method based on Ôû�-Ôêæ transformation

A dynamic and ultrasonic technology, applied in ultrasonic/sonic/infrasonic diagnosis, ultrasonic diagnosis, infrasonic diagnosis, etc., can solve problems such as inability to receive apodization of ultrasonic echo

Inactive Publication Date: 2003-07-23
TSINGHUA UNIV
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Problems solved by technology

The existing digital ultrasonic beamforming technology based on delta-sigma transformation cannot achieve apodization of ultrasonic echo reception

Method used

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  • Ultrasonic dynamic receiving apodization method based on Ôû�-Ôêæ transformation
  • Ultrasonic dynamic receiving apodization method based on Ôû�-Ôêæ transformation
  • Ultrasonic dynamic receiving apodization method based on Ôû�-Ôêæ transformation

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Embodiment Construction

[0026] The present invention realizes receiving apodization through a data storage unit. The data storage unit contains the calculation results of receiving apodization and summing operation. When processing echo data in real time, the result of delta-sigma sampling (1-bit binary number) is input as the address of the storage unit, and the data stream read out sequentially is the synthetic beam after receiving apodization weighting.

[0027] Assuming that the number of analog channels is N, considering the symmetry, the symmetrical two channels in the analog echo signal can be merged into one, so the number of address lines of the apodization data storage unit is (see figure 1 ):

[0028] When receiving focus p (p=1, 2, ..., P) receiving apodization, the size of the required storage unit is 2 M byte. The data in the storage unit is calculated by the following formula: DATA p ( A 0 ...

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Abstract

The method belongs to the technique areas of digital medical ultrasonic image processing. The characters are as follows. Based on non uniform sampling and delta-sigma transformation, the data storageunit is introduced to realize the dynamic receiving apodization by using the addressing method of multiple storage pages so as to restrain diffraction lobes caused by the array aperture and improve the quality of the ultrasonic image. The delta-sigma sampled data as the address of the apodization storage units are inputted. The apodization data of the focus P are stored into the related storage unit. Based on the page selection signal, the apodization data with different focus P are selected from the related storage units to form the output data stream, which form the composite wave after thelow pass filter and decimation.

Description

technical field [0001] The ultrasonic dynamic receiving apodization method based on delta-sigma transformation belongs to the digital medical ultrasonic image processing technology. Background technique [0002] The most critical part that determines the image quality of a digital medical ultrasound imaging system is the design of the front end. A well-designed digital front-end can greatly reduce the burden of post-processing while improving image quality. The digital front-end technology of multi-bit analog / digital conversion (ADC) sampling is relatively mature and can provide good image quality. This technology is mostly used in high-end digital medical ultrasound imaging systems. [0003] Δ-Σ transform, also known as Σ-Δ transform and feedback quantization, is a technique to reduce quantization errors by increasing the sampling rate and increasing the feedback link. GE first proposed the oversampling beamforming technology based on delta-sigma transform in 1993, and o...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A61B8/00G06F12/02G06T1/00
Inventor 彭旗宇高上凯
Owner TSINGHUA UNIV
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