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Ultrashort (Millisecond) Timing and a Rapid Film Changer in Pediatric Radiography: Evaluation of Dynapulse and Impulse Timing

Ultrashort (Millisecond) Timing and a Rapid Film Changer in Pediatric Radiography: Evaluation of... Abstract During the past 20 months an x-ray timer capable of exposures as short as 1/1000 second has been used to determine whether ultrashort exposures are more advantageous than those obtained with conventional timers, including the impulse timer.* The average impulse timer does not function faster than 1/60 second, but specially built ones produce exposures as short as 1/120 second, and, for practical purposes, the usable portion of this interval is probably 1/200 second. The Dynapulse timer is five times faster than the shortest possible exposure with an impulse timer.* Dynapulse exposures are produced by a controlled-electron-flow vacuum tube placed in the high-tension, or secondary, circuit of an ordinary rectified x-ray generator with a filter condenser across its output. This differs from conventional timers, which operate in the primary, or low-tension, circuit. Power from the condenser is released to the x-ray tube by the timer. It has been claimed that ultrashort http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png A.M.A. Journal of Diseases of Children American Medical Association

Ultrashort (Millisecond) Timing and a Rapid Film Changer in Pediatric Radiography: Evaluation of Dynapulse and Impulse Timing

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Publisher
American Medical Association
Copyright
Copyright © 1958 American Medical Association. All Rights Reserved.
ISSN
0096-6916
DOI
10.1001/archpedi.1958.02060050302012
Publisher site
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Abstract

Abstract During the past 20 months an x-ray timer capable of exposures as short as 1/1000 second has been used to determine whether ultrashort exposures are more advantageous than those obtained with conventional timers, including the impulse timer.* The average impulse timer does not function faster than 1/60 second, but specially built ones produce exposures as short as 1/120 second, and, for practical purposes, the usable portion of this interval is probably 1/200 second. The Dynapulse timer is five times faster than the shortest possible exposure with an impulse timer.* Dynapulse exposures are produced by a controlled-electron-flow vacuum tube placed in the high-tension, or secondary, circuit of an ordinary rectified x-ray generator with a filter condenser across its output. This differs from conventional timers, which operate in the primary, or low-tension, circuit. Power from the condenser is released to the x-ray tube by the timer. It has been claimed that ultrashort

Journal

A.M.A. Journal of Diseases of Children – American Medical Association

Published: Mar 1, 1958

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