CBCT (cone beam computed tomography) image acquiring system and image preprocessing method thereof on basis of rotary collimator
An image acquisition system and collimator technology, applied in radiation therapy, treatment, etc., can solve problems such as motion stability and information loss
Active Publication Date: 2015-04-29
李宝生
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The method based on moving grating occlusion overcomes the shortcomings of the above algorithm, but it brings two problems at the same time: 1. The problem of motion stability; 2. The problem of partial information loss caused by interpolation of the occluded area
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[0026] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.
[0027] Such as figure 1 As shown, the principle diagram of the CBCT image acquisition system based on the rotating collimator of the present invention is given, which is composed of an X-ray source 401, a rotating collimator 201, a flat panel detector 501, a medical linear accelerator 601 and a treatment bed 701 , the patient to be treated lies on the treatment bed 701, the X-ray source 401 and the flat panel detector 501 are respectively located on both sides of the treatment bed 701, the rotating collimator 201 is located between the X-ray source 401 and the patient, and the medical linear accelerator 601 is located at Above the treatment bed 701. The X-ray source 401 and the flat panel detector 501 can rotate synchronously with the patient as the center. The light emitted by the X-ray source 401 is shielded by the rotating collimator 201 and irradia...
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The invention discloses a CBCT (cone beam computed tomography) image acquiring system on the basis of a rotary collimator. The CBCT image acquiring system comprises an X-ray source, a panel detector, a medical linear accelerator and a treatment couch. The CBCT image acquiring system is characterized in that the rotary collimator is arranged between the X-ray source and a patient. The image preprocessing method includes a) acquiring CBCT projection images on the basis of the rotary collimator; b) acquiring a discrete projection matrix of an exposure area; c) calculating an image matrix; d) acquiring projection images of a shaded part; e) acquiring discrete signals of images; f) acquiring an image suppressing scattering and having complete information. The CBCT image acquiring system and the image preprocessing method, the projection images of the shaded area and the corresponding exposure area constitute the projection image with the complete information, scattering signals are reduced, and the CBCT projection image suppressing the scattering signals and having the complete information can be obtained; imaging is clearer and more accurate, and the CBCT image acquiring system and the preprocessing method have the remarkable advantages and are convenient for application and popularization.
Description
technical field [0001] The present invention relates to a CBCT image acquisition system based on a rotating collimator and a preprocessing method thereof, more specifically, to a CBCT image acquisition system based on a rotating collimator that can obtain suppressed scattering signals and has complete information and its preprocessing methods. Background technique [0002] The CBCT device can acquire the volume image of the part to be treated online, has an open structure, can be easily integrated into a medical linear accelerator, and is easy to use. However, due to the influence of scattered photons, CBCT imaging quality is poor. At present, the hardware-based scatter measurement estimation method has attracted more and more attention. This method estimates the scatter distribution of the entire image by measuring the scatter distribution of the occluded area through interpolation, fitting and other methods. However, due to the need for additional scanning to determine t...
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Inventor 虞刚李宝生梁月强李洪升朱健李登旺
Owner 李宝生