GB1098615A - X-ray demonstration device - Google Patents

Abstract

1,098,615 X-ray apparatus.. M. C. HARRISON May 25, 1965 No. 22026/65 Heading H5R [Also in division G5]. Apparatus, for use in training radiographers, includes a prism 10 of material transparent to light and X-rays, and in which a number of different objects, some of material opaque to light and X-rays, are embedded. The prism is mounted on the top of a viewing box 32 in required position which can be noted by means of a grid graticule 30 marked on a sheet of plastic 29. An X-ray tube is supported on the box by a tripod 26 whose position is also noted. A film-holder can be positioned on the top of the box 32 underneath the sheet 29 and a radiograph of the prism taken. After development, the exposed film is replaced in the position occupied by the film-holder, the prism replaced in an identical position and the film (radiograph) viewed from the position previously occupied by the X-ray source (i.e. the centre of the tripod ring 27). The shadow images produced by the objects in the prism can thus be compared directly with the actual objects corresponding to them. Other radiographs may be taken with the prism in different positions or with X-ray incident on the prism from different angles. The prism material may be a plastic of the acrylic resin type, a methyl metracrylate monomer. The objects embedded in the block (Fig. 2, not shown), can consist of simple geometrical shapes made out of lead, e.g. a thin rod (11), an L-shape (13), a ladderlike object (15) or a metal sphere (16). Depending on the positioning of the apparatus, the shadow images produced by these vary in the amount of distortion of the original object shape. Other objects opaque or semi-opaque to light but transparent to X-rays, e.g. plastic coloured spheres (17A, 17B, 17C) (simulating gallstones) or air bubbles (18) demonstrate that such objects do not show on the radiograph.