TY - JOUR
AU - Wentworth, John H.
AB - Use of the Nine and One-Half-Inch Roll-Film Cassette with Conventional Spot-Filming Fluoroscopic Tables for Angiocardiography John H. Wentworth , M.D. Brooklyn, N. Y. Excerpt Chiefly to satisfy the needs of angiocardiography and cerebral angiography, many ingenious devices have been developed for producing a rapid series of radiographs. The basic requirement is to be able to change film rapidly between automatically co-ordinated exposures. Because of practical considerations of bulk and size, most devices using cut-film cassettes limit the radiographs available in anyone series to a number inadequate for complete angiocardiographic studies. Furthermore, the weight and inertia of conventional cassettes make sufficiently rapid changing of film impracticable. Hand-operated devices within these limitations have been used for many years, most of them homemade. The cassette principle was developed to a high degree by Scott and Moore in their tautograph (1). In Sweden it was carried further by the use of special light-weight reinforced cardboard cassettes; with the apparatus devised by Fredzell, Lind, Ohlson, and Wegelius (2) up to 25 such cassettes can be exposed in each of two right-angle planes simultaneously every two seconds. The development of the automatic roll-film photofluorographic camera and roentgen cinematography offered new means for rapid serialography, with the advantages of mechanical simplicity and the convenience of small bulk. Certain disadvantages, however, as compared to direct radiography, prevented general acceptance of the procedure for angiocardiography. The chief of these was the excessive radiographic exposure necessary, resulting in severe limitations due to conventional x-ray tube tolerance. Another was the small image size and some loss of photographic definition, especially in the examination of infants and young children. The adaptation of the Schmidt-Helm reflecting camera principle to photofluorography greatly reduced the amount of exposure necessary (3) but slowed the maximum speed of serialography with film larger than 35 mm. because of the necessity of mechanically “shaping” each film frame into the curved surface necessary for adequate focus before each exposure. For these and other reasons, direct radiography is still considered the method of choice. The roll-film cassette principle embodies much of the mechanical simplicity and ease of film handling of the photofluorographic camera, but still retains the advantages of direct radiography. During each exposure the film is held between two intensifying screens mounted on a mechanism for separating them from the film during film travel between exposures, the whole being electrically phased with the x-ray circuit. Dr. F. J. Hodges of Ann Arbor has recently developed a model using 12-inch roll film, which provides for as many as six exposures per second (4). In Europe there is now available an instrument devised by Dr. A. Gidlund which takes two simultaneous 12 × 12-inch exposures at right angles to each other on roll film at a rate of 8 pairs per second, with provision for fluoroscopic control of positioning.
TI - Use of the Nine and One-Half-Inch Roll-Film Cassette with Conventional Spot-Filming Fluoroscopic Tables for Angiocardiography
JF - Radiology
DO - 10.1148/57.5.741
DA - 1951-11-01
UR - https://www.deepdyve.com/lp/radiological-society-of-north-america-inc/use-of-the-nine-and-one-half-inch-roll-film-cassette-with-conventional-TklQbfn0cf
SP - 741
VL - 57
IS - 5
DP - DeepDyve
ER -