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Focal spot measurements

Regional Department of Medical Physics and Bio-Engineering, Christie Hospital and Holt Radium Institute, Wilmslow Road, Withington, Manchester M20 9BX

This excerpt was created in the absence of an abstract.

In a recent publication (Robinson and Grimshaw, 1975) a comparison was made of the pinhole and star-pattern methods of focal spot size determinations. The authors highlighted the practical difficulties associated with the pinhole technique and also the fact that this method does not take into account the effect on resolution of the focal spot intensity distribution. The star-pattern technique which could provide a quantitative measure of the radiographic properties of the focal spot was proposed as an alternative to the pinhole method.