Multi-energy-spectrum CT rapid iterative reconstruction method based on oblique projection correction technology
A technology of oblique projection and iterative reconstruction, applied in image enhancement, image analysis, instruments, etc., can solve the problem of inability to quickly reconstruct high-quality base material density images, and achieve the effect of speeding up the convergence speed
Active Publication Date: 2020-11-20
CAPITAL NORMAL UNIVERSITY
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Problems solved by technology
Due to the nonlinearity and pathological nature of the spectral CT reconstruction problem, the existing multi-energy spectral CT reconstruction algorithm cannot quickly reconstruct high-quality base material density images
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[0021] The present invention will be described in detail below in conjunction with the accompanying drawings and embodiments.
[0022] refer to figure 1 , the multi-energy spectral CT fast iterative reconstruction method based on the oblique projection correction technology provided by the embodiment of the present invention includes the following steps:
[0023] Step 1: Use the multi-energy spectrum CT system to scan the measured object to obtain N real polychromatic projection data of the measured object under N energy spectra, wherein one polychromatic projection data is correspondingly obtained under one energy spectrum.
[0024] Step 2, assign initial values to various base material density images of the measured object as estimated values of various base material density images.
[0025] Step 3: Perform forward projection on the estimated values of the density images of various base materials to obtain the estimated projection values of various base materials, a...
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The invention discloses a multi-energy-spectrum CT rapid iterative reconstruction method based on an oblique projection correction technology. The method comprises the steps that 1, acquiring multi-color projection data of a measured object under multiple energy spectrums; 2, obtaining density image estimation values of various base materials; 3, carrying out orthographic projection on the densityimage estimation value of the base material to obtain projection estimation values of various base materials and multi-color projection estimation values of the measured object; 4, calculating an error between the multi-color projection estimated value and the multi-color projection data, and correcting the projection of the base material by using an oblique projection technology to obtain projection residual errors of various base materials; 5, performing back projection on the projection residual error to obtain residual error images of various base materials, and updating a base material density image estimated value of the measured object; 6, judging whether a termination condition is met or not, if so, terminating iteration, and otherwise, turning to the step 3. According to the method disclosed in the invention, a plurality of base material density images of the measured object can be rapidly reconstructed according to the acquired multi-color projection data of the plurality ofenergy spectrums.
Description
technical field [0001] The invention relates to the technical field of X-ray CT imaging, in particular to a multi-energy spectral CT fast iterative reconstruction method based on oblique projection correction technology. Background technique [0002] X-ray Computed Tomography (X-ray CT for short) can present the internal details of objects without destroying or damaging them, and has been widely used in medicine, biology, industry, materials, ancient fossils and aerospace, etc. Numerous fields. The traditional CT imaging theory assumes that X-rays are composed of photons of a single energy, ignoring the polychromaticity of X-rays. Therefore, beam hardening artifacts such as cupping artifacts and Streak artifacts seriously affect the image quality. [0003] The multi-energy spectral CT imaging system uses X-rays under multiple different energy spectra to scan the measured object, and obtains the projection data of the measured object under multiple different energy spectra....
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Login to View More IPC IPC(8): G06T5/00
CPCG06T2207/10081G06T5/80
Inventor 赵树森潘慧莹赵星
Owner CAPITAL NORMAL UNIVERSITY