GB369662A - Improvements in and relating to the radioscopic and radiographic reproduction of a section through a body - Google Patents

Abstract

369,662. R÷ntgen - ray apparatus. POHL, E., 27, Hospitalstrasse, Kiel, Germany. Dec. 24, 1930, No. 38913. [A Specification was laid open to inspection under Sect. 91 of the Acts, Feb. 23, 1931.] [Classes 98 (i) and 98 (ii).] To examine or photograph any particular section through a body, the tube is fitted with a diaphragm to obtain a confined conical bundle of rays, a continuous relative movement (preferably circular) is produced between the body and the tube in a plane parallel to the screen or plate, and the tube is synchronously rocked so that the central ray intersects the section plane at substantially the same point. For radiography the motions of two of the three elements, the tube body and the plate, are proportional to the distances from the fixed plane, so as to produce a constant shadow image. For radioscopy the relative movement of the screen is not essential, the image being made to appear stationary by a moving optical system. Plastic images may be produced by obtaining in rapid succession images of adjacent sections. Plastic models may be produced by superposed images of adjacent sections. In one arrangement with a stationary body of the table 1, the screen or plate 10 and a tube frame 12 are mounted on a framework of parallel rods 7 by ball and socket joints 8. The rods are pivotally mounted at 6 on transverse rods 4 which rotate in brackets 2. These brackets are vertically adjustable to bring the pivots 6 into the plane of the section to be reproduced. The tube 20, with its diaphragm 19, is mounted by a Cardan suspension in the frame 12 and the frame 21 directly carrying the tube slides in a socket 23 at the end of an adjustable arm 25 on the rotated vertical shaft 29. For obtaining a visually stationary image a lens may be mounted above the screen by arms connected to the rods 7, and viewed through a stationary mask. Alternatively a moving mirror may be used. A secondary-ray diaphragm may be placed between the body and the screen, and moved so that its partition walls always lie in the direction of radiation. For plastic reproduction vertical movement may be given to the rods 4.