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Note on an Apparatus for Angiocardiography

Director of the Department of Diagnostic Radiology, Guy's Hospital, London

This excerpt was created in the absence of an abstract.

The increasing use of contrast media for the demonstration of cardiac abnormalities has created new problems in radiology. It is usually necessary to take ten or more films at one second intervals. Many special devices have been developed to solve this problem, and the apparatus to be described has the merit of being comparatively simple to construct.

The diagnostic value of this investigation depends largely on the comparison of the series, and it is a convenience to have them of such a size that they can be readily reviewed side by side. The apparatus, therefore, is an adaptation of the mass miniature principle of indirect radiography, but the film size is large enough to be studied without magnification.

The general construction (Fig. 1) consists of an Eastman Kodak aircraft camera, mounted vertically under a special trolley. A fluorescent screen is supported horizontally just under the trolley top by a light-proof tunnel at whose base is fixed the camera. The X-ray tube is positioned over the screen at a distance of 30 in.

Technical details. The camera was designed to focus at infinity only, so an extension ring was fitted to focus the screen image at 36 in. The shutter mechanism was completely removed, but apart from this no other alterations were necessary. The camera has a built-in motor which will move the film on at a speed of one frame per half second.