Cineroentgenography with Extremely Short Pulses

'Pulsing' was primarily used in cineroentgenography to mmlmlze patient irradiation during periods when no exposures were taking place, in other words during the change-over from one frame to another. As the time required for the change-over often amounted to 50 % of the total time, a considerable reduction in the patient dose was obtained by camera-controlled pulsing without any deleterious effects on the cineroentgenographic results. An exposure time shorter than that achievable with the camera shutter alone may be obtained by shortening the pulses and increasing the radiation intensity correspondingly. This produces a reduction in the motion blur in each frame, an advantage that is of great value, not only in the examination of the individual frames but also for the observation of movement during projection. Pulsing systems have been described by HOEFFKEN & JOTTEN (1963) and by BECKER (1963), who have demonstrated their significance for the recording of moving objects whereby, among other advantages, the apparent deformation which otherwise arises in objects in motion can be avoided. Pulse