Videofluorography and pulsed fluoroscopy using a 512 X 512-pixel digital image system.

The combination of videofluorography and pulsed fluoroscopy using an analog videodisc system has previously been investigated with regard to image quality and potential for dose reduction. The authors found that the system could be improved still further by replacing the analog disc with a 512 X 512-pixel digital image system, thereby increasing fluoroscopic image quality and permitting stored images to be recorded with a multiformat camera. The pulsed method is compared with low-dose-rate fluoroscopy, in which a continuous image is obtained at 1/4 of the normal rate. Whereas image quality using a low dose rate was inadequate for any useful purpose, pulsed fluoroscopy was sufficient for all but the most critical stages of the examination.

Multi-image camera for spot radiography at fluoroscopic examinations.

The image quality of photofluorographic spot films (70, 100 or 105mm) has bee gradually improving as high resolution image intensification has evolved. With newly available 1023-line fluoroscopic monitors providing 2.8 line pairs/mm resolution, it is now possible to photograph diagnostic images directly off the monitor. Such images provide detail similar to that currently available on 100mm spot films. A multi-image camera has been modified to record spot films from the video disc image resulting in marked reduction in patient radiation and film cost. Initial findings incorporating pulsed fluoroscopy using a video disc are discussed.

Radiographic, photofluorographic, and television imaging systems: an evaluation.

A feasibility study for the photographic recording of fluoroscopic images from a high resolution system is described. Resolution on the television monitor was 2 line pairs/mm, making clinically acceptable recordings possible. Significant reductions in radiation dose to the patient and potential financial savings are indicated if a multiformat camera is developed to photograph the monitor.