Cone beam image rebuilding method and device
An image reconstruction and cone-beam technology, which is applied in image data processing, 2D image generation, 3D modeling, etc., can solve the problems of low reconstruction efficiency, slow reconstruction speed, and poor reconstruction results, so as to improve imaging quality and improve Accuracy, the effect of reducing errors
Active Publication Date: 2012-09-19
SUZHOU HAOLI CULTURE MEDIA TECH CO LTD
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The conditions for the realization of analytical methods in practical applications are too strict, such as the joint algebraic reconstruction algorithm (SART), the maximum likelihood-expectation algorithm (ML-EM) and the ordered subset-expectation value maximization algorithm (OS-EM) , compared with the analytical method, the iterative method is more suitable for limited-angle projection and poor noise conditions, but in the actual application process, there are slow reconstruction speed, large amount of calculation, poor robustness and reconstruction efficiency not high problem
[0004] In addition, due to the offset of the rotation center of the C-arm, the x-ray picture obtained by the traditional C-arm is a non-isocentric cone beam image. If the non-isocentric image is directly used for reconstruction, the reconstruction result is relatively poor , so it is necessary to transform its non-isocenter
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[0049] figure 1 A method flow of cone beam image reconstruction in an embodiment is shown, including the following steps:
[0050] In step S10, the projection image is obtained by scanning, and the motion posture of the C-arm is tracked to obtain a three-dimensional motion matrix. In one embodiment, the projected image scanned by the C-arm is non-isocentric, that is, there is a deviation between the center of the projected image and the actual rotation center, so it is necessary to track the movement posture of the C-arm to correct the non-isocentric projection. Such as figure 2 As shown, the process of step S10 is specifically:
[0051] In step S120, a phantom reference point is extracted. In one embodiment, if image 3 As shown in , the phantom is an object mosaic of a predetermined number of shot balls arranged in a spiral, so that it appears as a shadow of several pixels on its projection. The shot balls in the phantom are uniform in texture and free of internal defe...
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The invention discloses a cone beam image rebuilding method, which comprises the following steps of: obtaining projected images by scanning, tracking the motion posture of a C-shaped arm, and calculating a three-dimensional motion matrix; converting the unequal center projected images according to the three-dimensional motion matrix to obtain equal center projected images; and rebuilding a cone beam image according to the equal center projected images. By the cone beam image rebuilding method and a cone beam image rebuilding device, the unequal center projected images obtained by scanning areconverted into the equal center images without increasing extra tracking equipment by tracking the motion posture of the C-shaped arm and combining the geometric relationship of projection, so that the cost is effectively reduced, the accuracy of the projected images is improved and the imaging quality and the robustness of the projected images are improved.
Description
【Technical field】 [0001] The invention relates to the field of computer imaging, in particular to a cone beam image reconstruction method and device. 【Background technique】 [0002] X-ray tomography computer imaging (computed tomography, referred to as CT) is a computer tomography imaging technology, which is not only used in the field of radiological diagnosis and medicine, but also an important means in the field of modern industrial non-destructive testing and exploration. It uses ray beams to scan objects. According to the scanning results, a specific reconstruction algorithm is used to present the density distribution inside the object in the form of two-dimensional or three-dimensional imaging. [0003] For this reason, many image reconstruction methods have been proposed, which can be roughly divided into two categories, namely analytical methods and iterative methods. The conditions for the realization of analytical methods in practical applications are too strict, ...
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IPC IPC(8): G06T11/00G06T17/00
Inventor 徐洪伟贾富仓胡庆茂
Owner SUZHOU HAOLI CULTURE MEDIA TECH CO LTD