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Proceedings Paper

The Roentgen Densitometer A Novel Device For Pediatric Cardiology
Author(s): Peter E. Engler; Paul J. Maluso; Rudolph S. Wagner; Louis R. M. Del Guercio; Farzin Davachi; Joseph D. Cohn
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Paper Abstract

The Roentgen densitometer comprises a conventional x-ray head and a compact cluster of six solid-state x-ray detectors in the place of conventional x-ray film. Each detector is connected via suitable amplifiers to one channel of a six-channel pen recorder. An infant or child is placed over the detectors such that the cardiac silhouette shadows the cluster, and a bolus of radio-opaque dye is injected into the external jugular vein. The dye coursing through the cardiopulmonary system modulates the intensity of X-radiation impinging upon the detectors thereby producing six simultaneous high-resolution densitometer curves from within the cardiac chambers. The curves are analyzed through a least mean square fit digitized program for abnormal hemodynamics resulting from intracardiac shunting and T, the exponential time constant, and the time to peak is computed for each curve. Analysis of these two parameters allows classification of the patients into four clinically distinguishable categories; right-to-left intracardiac shunt, left-to-right intracardiac shunt, bidirectional shunting,.and normal cardiac circulation. By this simple, inexpensive and relatively non-invasive means, congenital heart defects can be detected without resorting to cardiac catheterization procedures.

Paper Details

Date Published: 25 March 1976
PDF: 6 pages
Proc. SPIE 0070, Application of Optical Instrumentation in Medicine IV, (25 March 1976); doi: 10.1117/12.954622
Show Author Affiliations
Peter E. Engler, Saint Barnabas Medical Center (United States)
Paul J. Maluso, Saint Barnabas Medical Center (United States)
Rudolph S. Wagner, Saint Barnabas Medical Center (United States)
Louis R. M. Del Guercio, Saint Barnabas Medical Center (United States)
Farzin Davachi, Saint Barnabas Medical Center (United States)
Joseph D. Cohn, Saint Barnabas Medical Center (United States)


Published in SPIE Proceedings Vol. 0070:
Application of Optical Instrumentation in Medicine IV
Joel E. Gray; William R. Hendee, Editor(s)

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