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The accuracy of radiologic method in determining total lung capacity (TCL) was assessed by correlating radiologic TLC values with those obtained by Helium dilution method. Total lung capacity was estimated by both the methods in 60 normal healthy adult subjects and 30 patients of obstructive and restrictive lung diseases. Excellent correlation was found between these two methods in case of normal subjects and interstitial lung disease patients. No correlation however, was found in chronic obstructive airways disease patients.