[Proceedings: 70 mm photofluorography: a valuable aid in coronary angiographic studies]

With the development of new intensifiers using cesium iodide as the input phosphor and having a spatial frequency of up to 4 lines/mm, it has become possible to obtain high contrast serial photographs using a 70 mm camera. In 48 patients undergoing coronary arteriography, 35 mm cine and 70 mm spotfilms were obtained at exposures as follows: 3 msec, 75-95 kV at 200 mA for the 35 mm cine (50 frames/sec) and 6-10 msec, 75-95 kV at 300 mA (4 FRAMES/SEc) for the 70 mm images. Image quality and diagnostic information of the two media were compared. 70 mm films were of excellent quality. The vessel edges showed up sharp, the pictures were high in contrast, and small arteries in particular could be well defined. 70 mm photofluorography offers many advantages which are discussed.