Vessel Diameter Measurement Using Digital Subtraction Radiography

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Abstract
A method for obtaining absolute diameter and cross-sectional area measurements on subtraction digital images is described and tested in phantom vessels from 1.5 to 5.5 mm in diameter filled with I contrast at concentrations from 23 to 185 mg I/ml. A highly linear correlation of true vs. calculated diameter is demonstrated, with accuracy and reproducibility of the method varying from .+-. 1 to 2% at the highest I concentration to .+-. 30% in the smallest tube at the lowest concentration. A method is described for correction of the observed video density values to allow for nonlinearity of response of the imaging system to I density, and its effect on the measured diameters is demonstrated.