A Comparison Of The Number Of Rays Vs The Number Of Views In Reconstruction Tomography

R. A. Schulz; E. C. Olson; K. S. Han

doi:10.1117/12.955955

27 December 1977 A Comparison Of The Number Of Rays Vs The Number Of Views In Reconstruction Tomography

R. A. Schulz, E. C. Olson, K. S. Han

Proceedings Volume 0127, Application of Optical Instrumentation in Medicine VI; (1977) https://doi.org/10.1117/12.955955
Event: Application of Optical Instrumentation in Medicine VI, 1977, Boston, United States

Abstract

In the field of x-ray reconstruction tomography, many sets of attenuation data are gathered at various angular orientations to the object. Each set of data is divided into many individual elements where each element represents a single pencil beam measurement of attenuated x-rays at some perpendicular distance from the origin. Given this scheme of data collection, it is reasonable to ask the following question: For a given reconstruction diameter, is it more important to collect more sets of projection data - views, or more elements per projection - rays? The answer to this question is basic to the design of computer assisted tomographic (CAT) scanners. Using simulated projection data, we show that for the case of Rotate/Translate geometry, the reconstructed picture is much more sensitive to rays than to views. That is, given the design choice between increasing the number of views or increasing the number of rays per view, one would clearly prefer to sample rays more frequently. This concept may be generalized to any geometry CAT scanner being particularly relevant in the design of pure rotational fan beam CAT scanners.

Citation Download Citation

R. A. Schulz, E. C. Olson, and K. S. Han "A Comparison Of The Number Of Rays Vs The Number Of Views In Reconstruction Tomography", Proc. SPIE 0127, Application of Optical Instrumentation in Medicine VI, (27 December 1977); https://doi.org/10.1117/12.955955

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