Cone-beam image reconstruction for detectors with nonsquare detector elements

Kwok C. Tam

doi:10.1117/12.431129

3 July 2001 Cone-beam image reconstruction for detectors with nonsquare detector elements

Kwok C. Tam

Proceedings Volume 4322, Medical Imaging 2001: Image Processing; (2001) https://doi.org/10.1117/12.431129
Event: Medical Imaging 2001, 2001, San Diego, CA, United States

Abstract

In many cone beam reconstruction algorithms square geometry for the detector elements and cubic geometry for the reconstruction voxels are assumed. With such geometry the various operations in image reconstruction, notably projection and backprojection, can be carried out in the same manner at all angles, resulting in uniform image quality and ease of operation. However, in current multi-row cone beam CT systems the spacing between the detector rows is typically greater than the lateral spacing between the detector elements for the reconstruction of objects with slice thickness greater than the lateral resolutions. The asymmetric voxel dimensions and detector element dimensions introduce complications in the image reconstruction operations, and potentially non-uniform image quality. We have developed a procedure to preprocess the cone beam data detected on non-square detector elements for compatibility with cone beam reconstruction algorithms in which symmetric voxel dimensions and detector element dimensions are assumed. Complications and potential non-uniformity in image reconstruction operations are eliminated through simple scaling of the input cone beam projection data and decompression/elongation of the intermediate reconstructed image while retaining the symmetric geometry in the reconstruction algorithm. The procedure is a generic solution to cone beam image reconstruction applicable to all types of reconstruction algorithms.

Citation Download Citation

Kwok C. Tam "Cone-beam image reconstruction for detectors with nonsquare detector elements", Proc. SPIE 4322, Medical Imaging 2001: Image Processing, (3 July 2001); https://doi.org/10.1117/12.431129

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