1978 Volume 27 Issue 3 Pages 139-142
Thorotrast amount deposited in patients, chiefly in the liver and the spleen, was determined with a NaI detector and a Computerised Axial Tomography (CT) . In the measurement of the γ-rays with the NaI detector, the geometry-factors, that are the distance from the detector to the source, the attenuation of the γ-rays in the tissue and the shapes of the liver and the spleen, were studied, and the mean amount deposited in the organs was determined. In the measurement with CT, the relationship of CT-Number and the amount of thorium was got, and the localized amount and the distribution in the organ were measured.
