Abstract
The multiple ellipse method has previously been shown to give accurate values for thoracic gas volume, but there has been little general use made of this radiologic measurement despite the ease with which it can be made. In purely restrictive lung diseases, measurements of thoracic gas volume accurately reflect the degree of restriction. In conditions like interstitial fibrosis, diffuse granulomas, pulmonary vascular congestion, and spondylitis, the radiologist can provide significant objective data relating to lung restriction by making measurements of thoracic gas volume. The presence of coexisting airway obstruction can limit the usefulness of thoracic gas volume measurements as an isolated measurement, but together with other measurements of pulmonary function it can help to monitor the restrictive process. The more widespread application of radiographic thoracic gas volume measurements to "restrictive" diseases in areas where gas dilution and body Plethysmograph facilities are not accessible would provide clinicians with an easy, accurate method for following changes in lung restriction.
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