Method for improving imaging quality of limited-angle CT through combination of ultrasonic image

Abstract

The invention discloses a method for improving the imaging quality of limited-angle CT (Computed Tomography). The method comprises the following steps that an X-ray emitter and an X-ray receiver are arranged above target tissue and below the target tissue respectively; the emitter is made to move around the tissue and emit X rays within a limited angle, and meanwhile, projection data are collected; primary reconstruction is conducted by the utilization of a synchronous algebraic reconstruction technology; a three-dimensional ultrasonic image of the tissue is obtained; registering is conducted on the ultrasonic image through the combination of a primary CT reconstruction result; effective gradient information of the ultrasonic image is extracted, an improved synchronous algebraic reconstruction technology is used for conducting reconstruction again and an limited-angle CT imaging result with quality improved is obtained. According to the method for improving the imaging quality of the limited-angle CT, the characteristic that ultrasonic imaging is clear at the edge of the z direction is utilized, the problems that the limited-angle CT reconstruction result is serious in image artifact and fuzzy in boundary in the z direction, and innovation is achieved.

Description

technical field [0001] The invention relates to the fields of biomedicine and image processing, in particular to a method for improving limited-angle CT (Computed Tomography, computerized tomography) imaging quality in combination with ultrasonic images. Background technique [0002] Traditional CT imaging technology reconstructs the three-dimensional structure inside the object according to the characteristic that different parts of the target tissue have different attenuation coefficients of X-rays. This method mainly uses a cone-beam X-ray emitter to surround the target tissue for 360°, emits X-rays at a certain angle, and uses an X-ray receiver to receive the X-ray receiver on the other side of the target tissue during each emission, thus obtaining several sets of X-rays. Project data. There are many methods for reconstructing the three-dimensional image of the target tissue from these projection data, and one of the more mature methods is the Simultaneous Algebraic Rec...

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Problems solved by technology

[0004] Purpose of the invention: The technical problem to be solved by the present invention is to provide a method for improving the quality of limited-angle CT imaging by combining ultrasonic images for the problem that the edges of the limited-angle CT imaging results are not clear in the z direction and the artifacts are serious.

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