Abstract
In recent years, isotopic and electronic methods have been devised for the estimation of regional lung function (1-7). These methods do not readily lend themselves to routine clinical use since they employ either labeled inert gases (1-3) or complex, laboratory-assembled electronic gear, such as photomultiplier tubes for measuring light emitted by a crystal which is excited by passage of fairly heavy (4, 5) or moderate (6) x-ray dosage through the lungs or x-ray-sensitive cadmium cells (7). Details of instrumentation used in these procedures are scant, so that attempts to reproduce these methods are most difficult. Radiopulmonography utilizes readily available commercial apparatus (figure 1). The source of radiation is an inexpensive, portable, x-ray machine; and the detecting apparatus is a dual scintillation detection system consisting of two matched probes, dual ratemeters, and a dual recorder-equipment available in most clinical radioisotope laboratories. To the writers' knowledge, this type of appara.tus, designed for measuring gamma emission, has not previously been used for the measurement of x-ray emission.
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