Method for generation of correction coefficient configured to eliminate CT artifacts and method for elimination of CT artifacts based on correction coefficient
A correction coefficient and pre-correction technology, which is applied to generate correction coefficients for eliminating CT artifacts, and eliminates CT artifacts based on the correction coefficients, which can solve the problem of inaccurate ideal projection values, low projection value efficiency, and incorrect phantom shapes. It can improve the correction effect, improve the calculation accuracy, and improve the calculation efficiency.
Active Publication Date: 2018-06-01
SHANGHAI UNITED IMAGING HEALTHCARE
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Problems solved by technology
Due to various errors in measuring projection values and differences in mathematical processing methods, it is easy to cause inaccurate ideal projection values
[0006] 2. Calculating the projection value of the ideal image according to the traditional method is inefficient
[0007] 3. Existing methods for removing ring artifacts have higher requirements on the shape of the correction phantom
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[0031] The present invention will be further described below through specific embodiments and in conjunction with the accompanying drawings.
[0032] Such as figure 1 As shown, the CT imaging system 100 may include an X-ray tube 110 , a detector 120 , a scanning bed 130 , a central processing system 140 and an image reconstruction system 150 . The X-ray tube 110 can emit X-rays, and the X-rays can pass through the object to complete the scanning of the object. In some embodiments, the X-ray tube 110 may scan the object multiple times from different angles to obtain raw scan data from multiple different angles. The detector 120 may receive X-rays from the X-ray tube 110 or X-rays penetrating an object, and convert the detected X-rays into electrical signals. The scanning table 130 can be used to place objects, such as calibration phantoms, patients or other objects to be inspected. The central processing system 140 can be used to process the data generated by the system, and...
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The present invention provides a method for generation of correction coefficient configured to eliminate CT (Computed Tomography) artifacts and a method for elimination of CT artifacts based on the correction coefficient. The method for generation of correction coefficient configured to eliminate CT (Computed Tomography) artifacts comprises the steps of: obtaining original projection data of a first object; based on the original projection data, determining an original image; performing processing of the original image, and obtaining an ideal image; based on the ideal image, computing ideal projection data; and based on the ideal projection data, determining a correction coefficient. The method allows computing of an ideal projection value to have clear theoretical basis so as to improve the computing precision, improve the correction effect on the artifacts and improve the computing efficiency.
Description
technical field [0001] The present invention relates to a method for eliminating CT artifacts, in particular to a method for generating correction coefficients for eliminating CT artifacts, and a method for eliminating CT artifacts based on the correction coefficients. Background technique [0002] In the field of CT imaging, the consistency of the detector channel is an important indicator to measure the quality of the detector. The inconsistency of the detector channels is manifested in the inconsistency of the intensity response of each detector unit and the inconsistency of the response to photons of different energies. This inhomogeneity will bring artifacts such as rings, bands, or pot bottoms to CT images. [0003] At present, the correction methods for eliminating ring artifacts include the linear correction method based on flat panel detectors and the correction method based on high-pass filtering of the original projection data. The correction method based on high-...
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Login to View More IPC IPC(8): G06T11/00
CPCG06T11/008G06T2211/421G06T2211/424
Inventor 傅建伟
Owner SHANGHAI UNITED IMAGING HEALTHCARE