High Speed Reprojection And Its Applications

Carl R. Crawford; James G. Colsher; Norbert J. Pelc; Albert H. R. Lonn

doi:10.1117/12.968646

27 June 1988 High Speed Reprojection And Its Applications

Carl R. Crawford, James G. Colsher, Norbert J. Pelc, Albert H. R. Lonn

Proceedings Volume 0914, Medical Imaging II; (1988) https://doi.org/10.1117/12.968646
Event: Medical Imaging II, 1988, Newport Beach, CA, United States

Abstract

Reprojection is the process by which projections are produced from an image such that, if these projections are filtered and backprojected, they yield the original image. Because of the computational expense of reprojection, algorithms that employ this process have never been widely used. A method is presented that enables an unmodified backprojector to be used as a reprojector. Because backprojectors are designed to exploit the parallelism in the backprojection algorithm, the time required to obtain reprojections is significantly reduced. Another method, based on the Fourier Slice Theorem, is presented that enables a general purpose array processor to be used as a high speed reprojector. It is also shown that the parameters of the reprojection algorithm can be adjusted to decrease significantly the time required to perform an application that uses reprojection. Finally, two applications of reprojection in computed tomography are discussed.

Citation Download Citation

Carl R. Crawford, James G. Colsher, Norbert J. Pelc, and Albert H. R. Lonn "High Speed Reprojection And Its Applications", Proc. SPIE 0914, Medical Imaging II, (27 June 1988); https://doi.org/10.1117/12.968646

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