A large field of view graduation offset reconstruction method and system
A large field of view and indexing technology, applied in instruments, computing, image data processing, etc., can solve problems such as slow reconstruction speed, iterative reconstruction that cannot be accelerated in parallel, and cannot handle different rotation indexing offsets. to save time
Active Publication Date: 2021-01-29
重庆真测科技股份有限公司 +2
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Problems solved by technology
Existing schemes can only deal with the problem that the offset of each rotation index is fixed, but cannot deal with the problem of different offsets of each rotation index; the existing scheme uses iterative reconstruction for large field of view CT reconstruction, which has better reconstruction quality
However, due to the serial computing characteristics of the iterative reconstruction method, the iterative reconstruction cannot accelerate the calculation in parallel, and the reconstruction speed is slow
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[0021] The specific content of the present invention is described in detail below in conjunction with accompanying drawing, as appended figure 2 As shown, the present invention discloses a large field of view graduation offset reconstruction system, including an X-ray detector 4, an X-ray source S, a base 2, and also includes a position detector 3, a controller 7 and a signal generator 9, The position detector 3 is installed on the system base 2 of the large field of view CT scanning, and the detection head is facing the radial surface of the object to be measured 6, and is used to obtain the offset Δd of the object to be measured 6 in the vertical direction, X-ray The outputs of the detector 4 , the position detector 3 , and the signal generator 9 are connected to the input of the controller 7 . The signal generator 9 triggers the signal, and the controller 7 acquires the data of the X-ray detector 4 and the position detector 3 synchronously after receiving the signal, and t...
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The invention provides a large-field-of-view indexing offset reconstruction method, which comprises the steps of: substituting actually measured CT data under a rotary indexing alpha<j'> for to-be-compensated CT data under a rotary indexing alpha<j>, so as to realize compensation of the to-be-compensated CT data, wherein a piece of CT data is a CT value acquired by means of an X ray detector unit after an X ray passes through an object to be detected under a rotary indexing; measuring vertical offset of the object to be detected under each rotary indexing, and correcting a detector angle according to each vertical offset so as to obtain a corrected detector angle; and regarding the corrected detector angles of all CT data as parameters, and carrying out filtering, back projection and reconstruction.
Description
technical field [0001] The invention relates to the field of CT image reconstruction, in particular to a reconstruction method and system for large field of view graduation offset reconstruction. Background technique [0002] At the end of the 19th century, Wilhelm Roentgen discovered X-rays. After that, the use of X-rays to detect the internal structure of objects has become an important means of non-destructive testing. With the development of computer technology, the application of computer has gradually penetrated into various disciplines. CT (Computed Tomography) is a new non-destructive testing method formed by the intersection of computer science and high-energy physics. This technology realizes the tomographic scanning and reconstruction of the measured object. And widely used in medical and industrial fields. [0003] Among many CT systems, horizontal industrial CT systems are widely used in railway, aerospace and other fields. Horizontal industrial CT systems ...
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IPC IPC(8): G06T11/00
CPCG06T11/003G06T11/006G06T2211/421
Inventor 邱焓蔡玉芳邹永宁高锐王璟瑞刘其鑫王珏路廷镇苏志军
Owner 重庆真测科技股份有限公司