3D Forward and Back-Projection for X-Ray CT Using Separable Footprints
作者： Yong Long , Jeffrey A Fessler , James M Balter
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摘要: Iterative methods for 3D image reconstruction have the potential to improve quality over conventional filtered back projection (FBP) in X-ray computed tomography (CT). However, computation burden of cone-beam forward and back-projectors is one greatest challenges facing practical adoption iterative CT. Moreover, projector accuracy also important methods. This paper describes two new separable footprint (SF) that approximate voxel functions as 2D functions. Because separability these functions, calculating their integrals a detector cell greatly simplified can be implemented efficiently. The SF-TR uses trapezoid transaxial direction rectangular axial direction, whereas SF-TT both directions. Simulations experiments showed SF are more accurate than distance-driven (DD) projector, which current state-of-the-art method field. rays associated with large cone angles. has similar speed DD about times slower.
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