Multi-energy CT scattering removal and noise reduction substance decomposition method, device, equipment and medium

Abstract

The invention relates to a multi-energy CT scattering-removing and noise-reducing substance decomposition method, device and equipment and a medium, and the method comprises the steps: carrying out the dimension reduction processing of the obtained energy spectrum data information of N different equivalent energies of a multi-energy spectrum imaging system and the ray transmission intensity information detected when a to-be-imaged object is scanned, and based on the obtained scattering-removed ray transmission intensity information and the corresponding multiple pieces of energy spectrum data information with different equivalent energies, generating decomposed and expanded projection data items, performing base material decomposition on the to-be-imaged object by using the decomposed and expanded projection data items to obtain a multi-energy CT scattering-removing noise-reducing substance decomposition result, N being an integer greater than or equal to 3, and obtaining a multi-energy CT scattering-removing noise-reducing substance decomposition result. The method solves the problems that the decomposition deviation of an original line integral model, namely a dual-energy / multi-energy CT material, is caused by the occurrence of a ray scattering signal during CT scanning, scattering artifacts occur in an image, and the quantitative performance of CT energy spectrum imaging is influenced, and the like, and realizes optimization processing such as efficient noise reduction of data while removing scattering correction material decomposition.

Description

technical field [0001] The present application relates to the technical field of radiation imaging, and in particular, to a multi-energy CT (Computed Tomography, computer tomography) de-scattering and noise reduction material decomposition method, device, equipment and medium. Background technique [0002] X-ray computed tomography (CT) is an important imaging technique widely used in medical diagnosis and treatment, industrial non-destructive testing and safety inspection. The basic principle of CT is to obtain a tomographic or three-dimensional image of the scanned object by reconstructing the image of the attenuated X-ray signal received by the detector according to the different absorption capabilities of X-rays by different substances. [0003] In the past ten years, dual-energy / multi-energy CT technology has developed rapidly. In 2006, the results of the first-generation medical dual-energy CT system were applied in clinical practice. Compared with single-energy spec...

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Problems solved by technology

[0007] This application provides a multi-energy CT descattering noise reduction material decomposition method, device, equipment and medium to solve the problem that the appearance of ray scattering signals during CT scanning will lead to the decomposition deviation of the original line integral model, that is, the dual-energy / multi-energy CT material , resulting in scattering artifacts in the image, reducing the quality of the reconstructed image and thus affecting the quantitative performance of CT energy spectrum imaging, etc., while descattering and correcting the decomposition of substances, it can achieve efficient data noise reduction and other optimization processing

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