Endoscopic ultrasonic imaging algorithm based on coding excitation and coherence coefficient

Abstract

The invention discloses an endoscopic ultrasonic imaging algorithm based on coding excitation and a coherence coefficient. The algorithm combines the advantages of a coding excitation technology and acoherence coefficient algorithm: through the coding excitation technology, a transmission excitation signal of ultrasonic waves is changed into a sequence coding signal from a traditional single sinepulse signal, and the coding length is increased, so that the average transmission power of the ultrasonic waves is improved, and the signal to noise ratio of an image is improved. Pulse compressionis carried out by utilizing good autocorrelation of a complementary sequence, so that the axial side lobe of imaging is effectively eliminated, and the axial resolution is improved. Finally, through acoherence coefficient adaptive beam forming algorithm, the incoherent energy is artificially reduced, namely the specific gravity of the energy of the noise signal in the whole image, inhibiting Gaussian noise and sidelobe noise in the image, and improving the transverse resolution of the image.

Description

technical field [0001] The invention relates to the field of medical ultrasonic endoscopic imaging, in particular to an endoscopic ultrasonic imaging algorithm based on coded excitation and coherence coefficient. Background technique [0002] The ultrasonic endoscope sends the probe integrated with the ultrasonic transducer into the human body through the biopsy forceps channel of the medical electronic endoscope, transmits and receives ultrasonic waves through the ultrasonic transducer and processes and calculates the echo signals to obtain the ultrasonic waves of human organs. The image is scanned to detect the lesion at the corresponding location. [0003] In the process of ultrasound imaging, the traditional beamforming algorithm is Delay and Sum (DAS), which can only realize the focus of echo data reception, and has no adaptability, and the imaging effect is poor. Inspired by the synthetic aperture technology of radar imaging, Jensen et al. in Denmark proposed a synthe...

AI Technical Summary

Problems solved by technology

In single-pulse excitation, due to the small duty cycle of the signal, when the peak power of the ultrasonic wave is close to the limit standard, its average power is often less than 1% of the limit value. Low, affecting image quality

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