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15 November 1978 X-Ray Tube Performance Characteristics And Their Effect On Radiologic Image Quality
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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.
© (1978) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Martin Braun, Werner Roeck, and Gary Gillan "X-Ray Tube Performance Characteristics And Their Effect On Radiologic Image Quality", Proc. SPIE 0152, Recent and Future Developments in Medical Imaging I, (15 November 1978);

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