CLINICAL VIDEODENSITOMETRY

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Abstract
Videodensitometry provides measurement of physiologic events that are accompanied by changing roentgenographic density and which can be resolved by fluoroscopy utilizing image intensifier-television chains for viewing. Analysis of the video information is made from videotape or video disk recordings, thereby minimizing the roentgen-ray exposure dose to the patient. Clinical applications include: (1) pulmonary ventilation and perfusion analyses which require only recorded fluoroscopy and no contrast agent injections; (2) mean blood flow measurements based on linear velocity calculations of angiographic contrast material passage through vascular channels. These measurements are independent of the injection site and concentration of the contrast material and can be made in most vessels resolved by the imaging system; (3) tissue transit times for angiographic contrast agents through capillary beds thus providing an estimate of organ perfusion. Videodensitometry is a relatively simple and inexpensive technique which should enhance our interpretation of morphologic roentgenographic studies.

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