Motion compensation algorithm for arbitrary translation of CT objects

Wen-Tai Lin

doi:10.1117/12.175112

11 May 1994 Motion compensation algorithm for arbitrary translation of CT objects

Wen-Tai Lin

Proceedings Volume 2167, Medical Imaging 1994: Image Processing; (1994) https://doi.org/10.1117/12.175112
Event: Medical Imaging 1994, 1994, Newport Beach, CA, United States

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.

Citation Download Citation

Wen-Tai Lin "Motion compensation algorithm for arbitrary translation of CT objects", Proc. SPIE 2167, Medical Imaging 1994: Image Processing, (11 May 1994); https://doi.org/10.1117/12.175112

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