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(Circulation. 1955;12:1034.)
© 1955 American Heart Association, Inc.

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Motion in Cardiovascular Radiography

CHARLES T. DOTTER M.D.¹

¹ From the Department of Radiology, University of Oregon Medical School, Hospitals and Clinics, Portland, Ore.

The minute has given way to the second as an expression of radiographic exposure duration. It is predicted that the millisecond will be the term of the future. Arterial blood velocity exceeds 50 cm. per second. In cardiovascular radiography, especially angiocardiography, maximum detail cannot be achieved unless the x-ray exposure is short enough to "stop" rapid movement. Practical experience indicates that exposures of 3 milliseconds' duration offer an economic alternative to high speed, serial angiocardiography. A method of achieving such exposures consists of a grid-controlled, hightension, switch tube operated in series with the diagnostic x-ray tube.