Spatial smoothing filter method and system for ultrasonic imaging

Abstract

The invention provides a space smooth filtering method and system for ultrasonic imaging. The method comprises: setting the order and the intermediate coefficient of a transverse smooth filter; according to the transverse order, the transverse intermediate coefficient and a picture aspect ratio, calculating the axial order and the axial intermediate coefficient of an axial smooth filter; calculating other coefficients of the transverse smooth filter and the axial smooth filter; and utilizing the transverse smooth filter and the axial smooth filter to perform transverse filtering or axial filtering smooth processing on an image. According to the method and system provided by the invention, the transverse smooth filter and the axial smooth filter are employed to successively perform filtering processing transversally and axially on a two-dimensional image so that the consistency of the smooth degrees of an ultrasonic image in a transverse direction and in an axial direction is ensured, and the order and coefficient of the transverse smooth filter or the axial smooth filter can be automatically adjusted according to user arrangement or ROI frame change so that self-adaptive image space smooth filtering processing is realized.

Description

technical field [0001] The invention relates to the field of signal and image processing, which is applied to ultrasonic diagnostic instruments in the medical equipment industry. More specifically, the invention relates to an adaptive spatial smoothing filter method and system for ultrasonic imaging. Background technique [0002] Ultrasound imaging has become one of the most widely used diagnostic techniques in clinical practice because of its non-invasive, real-time, easy-to-operate, and low-cost advantages. The two main functional modes of ultrasound imaging are black-and-white (B) mode and color (CF) mode, among which, the CF mode calculates the frequency shift of the ultrasonic signal due to the Doppler effect, and obtains the blood flow velocity through the frequency shift and uses Different colors (red, blue) and shades are used to obtain real-time color blood flow images. [0003] Regardless of the black-and-white (B) mode or the color (CF) mode, in order to ensure t...

AI Technical Summary

Problems solved by technology

The smoothing filter of this method does not consider the asymmetry of the two-dimensional image signal in the horizontal and axial directions (for example, the horizontal and axial distances between points are not equal), so that it cannot maintain the same horizontal and axial distance. If the degree of smoothing in one direction is higher and the degree of smoothing in the other direction is lower, the image will have obvious "line feeling", which will lead to a greatly reduced effect of spatial smoothing filtering on ultrasound images

In addition, in the actual application of ultrasound imaging, the doctor will adjust the imaging depth and the size of the region of interest (ROI box) according to individual differences and other factors, which will also result in the horizontal and axial distortion of the entire image or the region of interest. The number of points and the distance between points change, so the fixed filter operators and filter coefficients in the existing filtering scheme obviously cannot meet the actual needs

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