Pulse Doppler hyperspectral resolution imaging processing method and processing system

Abstract

The invention provides a pulse Doppler hyperspectral resolution imaging processing method and processing system, the method comprising: acquiring IQ signals respectively corresponding to N sampling points on each scanning line, and Above, perform wall filter processing on it to form the IQ signal wall filter sequence corresponding to each scanning line; respectively perform FFT transformation on each sampling point in the IQ signal wall filter sequence in the slow time direction and fast time direction , to obtain the energy distribution matrix of each sampling point at different frequency shifts; obtain the velocity distribution matrix matching the energy distribution matrix; call the velocity sequence for display, query the velocity distribution matrix with the velocity sequence and an energy distribution matrix matched with the velocity distribution matrix to obtain an energy sequence corresponding to the velocity sequence for final spectrum display. In the present invention, when the transmission signal bandwidth is wide or the scatterer speed is fast, the velocity resolution is greatly guaranteed, and the velocity spectrum resolution is greatly improved.

Description

technical field [0001] The invention belongs to the technical field of medical ultrasound, and mainly relates to a pulse Doppler hyperspectral resolution imaging processing method and a processing system. Background technique [0002] Ultrasound imaging has become one of the most widely used means of auxiliary diagnosis in clinical practice because of its non-invasiveness, real-time performance, convenient operation, and low price. Among them, pulsed Doppler imaging can conveniently and quickly measure the specific flow velocity of blood flow, and has become a criterion for judging certain diseases in clinical diagnosis. [0003] The traditional pulse Doppler processing technology performs one-dimensional Fourier transform on the echo signal in the slow time direction to obtain the frequency shift distribution and its energy, and calculates the corresponding velocity according to the frequency shift distribution and the center frequency of the transmitted signal. According ...

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Problems solved by technology

[0003] The traditional pulse Doppler processing technology performs one-dimensional Fourier transform on the echo signal in the slow time direction to obtain the frequency shift distribution and its energy, and calculates the corresponding velocity according to the frequency shift distribution and the center frequency of the transmitted signal. According to the Doppler effect, the frequency shift caused by the movement of scatterers is proportional to the product of the frequency of the transmitted signal and the velocity of the scatterers; The fast scattering sub-frequency shift has a wider bandwidth and poor spectral resolution, while the slow scattering sub-frequency shift has a narrower bandwidth and the corresponding spectral resolution is better; at the same time, the Doppler spectral resolution is affected by the transmitted signal The bandwidth has a great influence. When the gate is small, the transmitted signal is short, its bandwidth is wide, and the spectral resolution of Doppler is poor; in addition, for scatterers with the same reflection energy at different speeds, fast scatterers are earlier Go out of the sampling volume, so that within a certain period of time (N pulse repetition time (PRT)), the reflection signal of the fast scatterer is less, and the traditional method of obtaining the sampling signal by simple averaging or difference method of the signal in the sampling gate , so that the energy of the high-speed blood flow is weakened more, so that the energy of the final velocity spectrum is not uniform

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