A Highly Accurate Focal Spot Camera—Laboratory and Field Model

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Abstract
A device was developed to determine accurately and quickly the shape, size and intensity distribution of an X-ray tube focal spot. The pinhole device weighs only 1 kg and is portable, enabling it to be used either as a field unit or in a laboratory. The special design obviates any risk of irradiation danger to the investigator or thermal overloading of the X-ray tube under investigation. The degree of accuracy with which the central beam can be located is better than .+-. 250 .mu.m, well beyond the requirements of the latest NEMA [National Electrical Manufacturers Association] standards regarding dimensional measurements of diagnostic X-ray tube focal spots. A star test pattern picture may be taken instead of the pinhole picture if required. The device is described, and areas of application are discussed.

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