Limited angle cone-beam CT image reconstruction method based on geometric image moment
A geometric image, limited angle technology, applied in the field of medical image reconstruction, can solve the problems of not meeting the requirements of clinical CT real-time imaging, losing the original details of the image, affecting the resolution of feature points, etc.
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[0078] The technical solutions of the present invention will be described in detail below in conjunction with the accompanying drawings.
[0079] A limited-angle cone-beam CT image reconstruction method based on geometric image moments, such as figure 1 shown, including the following steps:
[0080] Taking the three-dimensional Shepp-logan head model as the computer simulation experiment object, the size is 512*512*60, and the distances from the X-ray source of the simulated CT machine to the rotation center and the detector are 570mm and 1040mm, respectively. The rotational scanning range of the cone beam CT equipment is [γ,360°-γ], where γ=50°; the angle sampling value is 1160; each sampling angle corresponds to 672 detector units, and the size of the detector unit is 1.407mm.
[0081] Step (1), obtain the cone beam projection data under the condition of limited angle scanning as attached figure 2 , 3 , 4, ρ is the distance between the coordinate origin O and the featu...
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