A fan-beam short-scan CT reconstruction method and device with offset center of rotation
A rotating center, fan beam technology, used in computer tomography scanners, instruments for radiological diagnosis, medical science, etc., can solve problems such as serious artifacts, meet the requirements of reducing the accuracy of mechanical assembly, solve serious artifacts, The effect of resolving the effects of geometric errors
Active Publication Date: 2020-06-23
BEIHANG UNIV +1
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[0005] In order to solve the serious artifact problem that occurs when using traditional short-scan CT reconstruction algorithms, the present invention provides a fan-beam short-scan CT reconstruction method and device with offset rotation center
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[0038] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments It is only some embodiments of the present invention, but not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.
[0039] The equivalent schematic diagram of standard fan beam scanning is as follows: image 3 As shown, when the line connecting the X-ray source and the center of rotation is perpendicular to the detector, the X-ray source and the detector remain stationary, and the scanned slice rotates 360° around the rotation axis (point O). This scanning pro...
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The invention provides a fan beam short-scan CT reconstruction method and device with rotation center offset. The method comprises the following steps: obtain non-full-circumference sinogram data generated by a scanned section in the rotation process and calculating the offset value of the rotation center projection by using a cross correlation method; obtain the offset value of the rotation center projection by the cross correlation method; fill the non-full-circumference sinogram data into full-circumference sinogram data according to the offset value of the rotation center projection and the short-scan CT reconstruction data filling formula under the rotation center offset; a standard filtered back projection algorithm is used to reconstruct the full-cycle sinogram data. The invention solves the serious artifact problem caused by using the traditional short-scan CT reconstruction algorithm, solves the geometric error influence caused by the rotation center offset of the turntable, and reduces the requirement of the reconstruction algorithm on the mechanical assembly accuracy.
Description
technical field [0001] The present invention relates to the field of CT technology, and more particularly, to a fan-beam short-scan CT reconstruction method and device with offset rotation center. Background technique [0002] CT (Computed Tomography, computerized tomography) is a non-destructive testing method that uses the projection information of objects under different viewing angles, combined with image reconstruction algorithms, to obtain internal quality status and structural information of objects. The field has a wide range of applications. The standard circular trajectory third-generation fan-beam CT scanning method is as follows: the positions of the X-ray source and the detector remain relatively unchanged, and they rotate around the object to be scanned in the middle synchronously for one cycle or more; or the X-ray source and the detector remain fixed. The object to be scanned is placed on the middle turntable, and the turntable rotates once or more (the data...
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IPC IPC(8): A61B6/03
CPCA61B6/032A61B6/5223
Inventor 杨民孙亮孟凡勇林强冯健宋鑫张玉成
Owner BEIHANG UNIV