A geometrical calibration device and method for a static cone-beam CT imaging system
A CT imaging and geometric calibration technology, applied in medical science, diagnosis, computed tomography scanners, etc., can solve the problems of limited application range and low calibration accuracy of geometric calibration methods, and achieve the effect of high calibration accuracy and precise calibration
Active Publication Date: 2019-12-13
SHENZHEN INST OF ADVANCED TECH
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[0004] The present invention provides a geometric calibration device and method for a static cone-beam CT imaging system, aiming to solve the problems of limited application range and low calibration accuracy of the existing static cone-beam CT imaging system geometric calibration methods
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[0026] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.
[0027] As the first embodiment of the present invention, such as figure 1 As shown, a static cone-beam CT imaging system geometric calibration device provided by the present invention is placed on an optical table, and the device includes several cold cathode X-ray tubes 20 and a support frame 10:
[0028] Each cold cathode X-ray tube 20 is used as an X-ray emission source (hereinafter referred to as X-ray source), and the support frame 10 (such as figure 2 As shown, it is a schematic diagram of the support frame 10) for installing cold cathode X-ray tubes, and several cold cathode X-ray tubes 20...
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A geometric calibration device for a static cone beam computed tomography (CT) imaging system, comprising a plurality of cold cathode X-ray tubes (20) which are arranged in a line or in an arc so as to form an array of multi-beam X-ray sources, each cold cathode X-ray tube serving as an X-ray emission source; a support frame (10) reserves adjustment spaces on X, Y and Z axes such that after the plurality of cold cathode X-ray tubes are mounted on the support frame, the position of each cold cathode X-ray tube may be adjusted respectively in the three directions of the X, Y and Z axes. By means of adjusting each cold cathode X-ray tube in the three directions of the X, Y or Z axis, the geometric position of each X-ray source is accurately calibrated, calibration accuracy being extremely high. Further provided is a geometric calibration method for a static cone beam CT imaging system, which utilizes the described device to achieve geometric calibration for a static cone beam CT imaging system.
Description
technical field [0001] The invention belongs to the field of X-ray CT imaging, in particular to a geometric calibration device and method for a static cone-beam CT imaging system. Background technique [0002] Since the computed tomography (CT) image reconstruction algorithm is based on ideal system geometric parameters, the CT system has very strict requirements on the geometric parameters and installation accuracy of the radiation source, the object to be scanned, and the detector. At present, the existing geometric calibration methods of cone beam CT systems are divided into two types: phantom calibration and algorithm calibration: the phantom-based calibration method adopts a specially designed calibration phantom, obtains the geometric error parameters of the system during the calibration process, and These parameters are used for the hardware adjustment of the system or directly for later image reconstruction; the algorithm-based geometric calibration method directly p...
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IPC IPC(8): A61B6/03A61B6/00
CPCA61B6/032A61B6/4085A61B6/542A61B6/582
Inventor 石伟梁栋洪序达胡战利蒋昌辉张其阳
Owner SHENZHEN INST OF ADVANCED TECH