An Apparatus providing a Combined Radiograph and Gamma Scan

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Abstract
The value of γ encephalography in the localisation and diagnosis of intracranial lesions is now widely recognised. There remains, however, a difficulty over the presentation of results in relating the image accurately to the bony contour of the skull. Several systems are in use; usually the outline of the head is drawn by hand on the completed photoscan with the help of a few previously fixed positions denoting the external bony landmarks. This arrangement, whilst useful, is always potentially inaccurate. Other systems rely on various methods of aligning the photoscan with an existing “straight” X-ray film of appropriate projection and re-photographing the whole by transmitted light as a “composite” presentation (Selverstone and Gillespie, 1963). This system is tedious, time and film-consuming, and is almost always inaccurate on account of slight but inevitable differences in projection of the original X-ray and the photoscan. In an attempt to overcome the objections to these methods, an apparatus has been devised for making a simultaneous X-ray and γ photoscan on the same film, the one being superimposed on the other by a double exposure technique.

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