Evaluation Of Fan Beam Computerized Tomography Systems

Alicia M. Walsh; Ikram E. Abdou

doi:10.1117/12.942125

18 January 1988 Evaluation Of Fan Beam Computerized Tomography Systems

Alicia M. Walsh, Ikram E. Abdou

Proceedings Volume 0829, Applications of Digital Image Processing X; (1988) https://doi.org/10.1117/12.942125
Event: 31st Annual Technical Symposium on Optical and Optoelectronic Applied Sciences and Engineering, 1987, San Diego, CA, United States

Abstract

The relationship between processing time and image quality of fan beam computerized tomography (CT) systems was examined using computer simulations. Process-ing time was related to the number of projections and samples per projection, and image quality was measured using discrete normalized mean squared error, discrete normalized mean absolute error, and binary error. First, simula-tions were performed on resolution test patterns, measuring the effect of changing the linear or angular spacing on the image quality. The best trade-off between time and resolution appeared to be at a spacing of 3 pixels for linear resolution, and at an angular frequency corresponding to a 16-sector circle. In addition, computer experiments were performed on "industrial" test patterns, measuring the effect of increasing the number of projections and samples per projection on the image quality. The results showed that the optimum choice of these parameters is on the order of N for an N x N image grid, with slight variations depending on the shape of the test pattern used.

Citation Download Citation

Alicia M. Walsh and Ikram E. Abdou "Evaluation Of Fan Beam Computerized Tomography Systems", Proc. SPIE 0829, Applications of Digital Image Processing X, (18 January 1988); https://doi.org/10.1117/12.942125

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