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Proceedings Paper

Motion compensation algorithm for arbitrary translation of CT objects
Author(s): Wen-Tai Lin
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Paper Abstract

This paper presents a compensation technique for mitigating the blurring and streak artifacts in CT images caused by object translation. In order to detect and quantify the errors caused by motions, we first establish a nonsensor-based means to measure the incompleteness of a projection data set. Furthermore, with in-plane ray cancellation scheme, we show that it is possible to locate the regional motions. We then derive an isotropic reference, called centroid, to align parallel projections. The same concept is applied to fan beam projections except that here we use two sets of fan beam centroid to guide the projection alignment: one obtained from the original projection data set and the other from a pilot projection set. The latter is the reprojection of an iteratively improved image reconstructed from the updated projections. The convergence rate of this algorithm is demonstrated through simulations with projections based on mathematical phantom and human subject.

Paper Details

Date Published: 11 May 1994
PDF: 12 pages
Proc. SPIE 2167, Medical Imaging 1994: Image Processing, (11 May 1994); doi: 10.1117/12.175112
Show Author Affiliations
Wen-Tai Lin, General Electric Co. (United States)

Published in SPIE Proceedings Vol. 2167:
Medical Imaging 1994: Image Processing
Murray H. Loew, Editor(s)

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