Method for determining angle increment of 3D cone-beam industry CT through continuous scan
A technology of angle increment and determination method, applied in the field of X-ray computed tomography, which can solve the problems of difficulty in detectors and turntables, inaccurate determination of CT scan angle increments, and difficulty in the adoption of three-dimensional cone beam industrial CT systems. , to achieve the effect of easy engineering implementation, high precision and simple implementation process
Inactive Publication Date: 2011-11-02
BEIHANG UNIV
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Problems solved by technology
[0004] In practical applications, compared with the step-by-step scanning method, there is a prominent problem in the continuous scanning method: because it is difficult to completely synchronize the working timing of the detector and the turntable, the CT scanning angle increment cannot be accurately determined
However, this method is only suitable for 2D industrial CT systems based on linear array detectors, and it is difficult to adopt for continuous scanning 3D cone beam industrial CT systems based on area array detectors.
[0005] At present, there is no method for determining angle increments for continuous scanning 3D cone-beam industrial CT systems based on area array detectors
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[0044] (1) Place the object to be scanned on the turntable of the three-dimensional cone beam industrial CT system to ensure that the object is covered by the cone beam at any scanning angle;
[0045] (2) Transilluminate the object with cone beam rays. At the same time, the inspection table rotates continuously at a constant speed, and the area array detector continuously collects the projection of rays transmitted through the object at a fixed sampling speed to obtain a two-dimensional projection image;
[0046] (3) When the inspection table rotates 380 degrees, the detector stops sampling, and the inspection table and the radiation source stop at the same time, that is, a single circular orbit cone beam CT scan is completed;
[0047] (4) When the scanning is finished, the multiple two-dimensional projection images acquired by the area array detector are arranged in order of acquisition time to form a set of two-dimensional projection images I(i, m, n), where i represents the ...
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The invention belongs to the technical field of X-ray computed tomography, and in particular relates to a method for determining angle increment of a 3D cone-beam industry CT through continuous scan, which comprises the following steps: (1) performing single circular orbit cone-beam CT scan to acquire a group of 2D projection images; (2) performing logarithmic demodulation on the 2D projection images in the step (1) to acquire a group of 2D line integral images; (3) calculating related coefficients between a first 2D line integral image in the step (2) and other 2D line integral images in thestep (2) to form a 1D related coefficient array; (4) searching the maximum value in the 1D related coefficient array obtained in the step (3) to record the serial number of the maximum value in the array; and (5) subtracting the serial number corresponding to the maximum value by 1 and then dividing by 2pi, and obtaining a result, namely the angle increment of a 3D cone-beam industry CT through the continuous scan. The method has the advantages of simple and high-efficiency implementation process, high precision, and no need of special hardware or extra cone-beam scan projection data.
Description
technical field [0001] The invention relates to a method for determining an angle increment of a continuous scanning three-dimensional cone-beam industrial CT, belonging to the technical field of X-ray computer tomography (CT). Background technique [0002] In the X-ray CT system, the X-ray source emits X-rays, which pass through a certain area of the detected object from different angles, and the detector placed opposite the ray source receives them at corresponding angles, and then attenuates the rays according to different degrees at each angle. Using a certain reconstruction algorithm and computer calculations, the ray attenuation coefficient distribution mapping image of the scanned area of the object is reconstructed, so that the image can be reconstructed by projection, and the characteristics of the medium density, composition, and structural shape of the object in the area can be reproduced without loss. . [0003] Because of the high imaging efficiency, the ...
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IPC IPC(8): G01N23/04
Inventor 傅健江柏红
Owner BEIHANG UNIV