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Proceedings Paper

X-Ray Tube Performance Characteristics And Their Effect On Radiologic Image Quality
Author(s): Martin Braun; Werner Roeck; Gary Gillan
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Paper Abstract

The paper is a two part discussion of: (1) indices which characterize focal spot (F.S.) performance, and (2) the usefulness of these indices for a future F.S. standard. - (1) The two primary parameters of an x-ray source are source geometry (intensity distribution) and maximum source strength (loadability). Source geometry is often summarized by a number called "size", and loadability by a kw-number. We define as an overall F.S. Performance Factor p the ratio of two "size" indices: (a) a "loadability size" we and (b) a "Resolv-ing (imaging performance) size" B (e.g. "RMS equivalent focal spot"). Both describe the given F.S. in terms of a uniform square F.S.; for (a) having same loadability, for (b) having same systems related imaging performance, as the given F.S. - (2) The present F.S. standard specifies two size parameters: geometrical F.S. extent F, and "effective" F.S. size Feq derived from resolution patterns. Both parameters are in general not a measure of either loadability (we) or imaging performance (B). It is suggested to base a future standard on a rigorous criterion. Since rigorous data are difficult to obtain at present, approximate methods for compliance verification must be allowed; e.g. by utilizing the classical methods of resolution, pinhole and slit camera in a meaningful way.

Paper Details

Date Published: 15 November 1978
PDF: 10 pages
Proc. SPIE 0152, Recent and Future Developments in Medical Imaging I, (15 November 1978); doi: 10.1117/12.938200
Show Author Affiliations
Martin Braun, Radiologic Sciences Inc. (Pfizer) (United States)
Werner Roeck, University of California at Irvine (United States)
Gary Gillan, University of California at Irvine (United States)


Published in SPIE Proceedings Vol. 0152:
Recent and Future Developments in Medical Imaging I
Norman A. Baily, Editor(s)

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