Image reconstruction on virtual PI-lines using filtered-backprojection in circular cone-beam CT

Lifeng Yu; Dan Xia; Yu Zou; Xiaochuan Pan

doi:10.1117/12.595857

29 April 2005 Image reconstruction on virtual PI-lines using filtered-backprojection in circular cone-beam CT

Lifeng Yu, Dan Xia, Yu Zou, Xiaochuan Pan

Proceedings Volume 5747, Medical Imaging 2005: Image Processing; (2005) https://doi.org/10.1117/12.595857
Event: Medical Imaging, 2005, San Diego, California, United States

Abstract

Recently, a 3D filtered-backprojection (FBP)-based algorithm for image reconstruction on PI-line segments in a helical cone-beam CT scan has been developed (Zou and Pan, 2004). In the present work, we derive new reconstruction algorithms for circular cone-beam scans based upon this algorithm and a concept of virtual PI-line. We prove that, in the case of conventional full- and short-scan, the newly derived algorithms are mathematically identical to existing algorithms. More importantly, in the case of reduced-scans in which the scanning angle range is less than that in a short-scan, the new algorithms can yield exact region of interest (ROI) reconstruction in mid-plane and approximate ROI reconstruction in off-mid-planes. We have performed a preliminary numerical study that verifies our theoretical assertions.

Citation Download Citation

Lifeng Yu, Dan Xia, Yu Zou, and Xiaochuan Pan "Image reconstruction on virtual PI-lines using filtered-backprojection in circular cone-beam CT", Proc. SPIE 5747, Medical Imaging 2005: Image Processing, (29 April 2005); https://doi.org/10.1117/12.595857

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