Ct - a device for the quantitative determination of the mineral content of bone

摘要

A method of quantitatively determining bone salt with CT equipment, which comprises scanning a target site and samples prepared by mixing a water equivalent with a standard bone-salt equivalent in various proportions with CT equipment and determining the bone-salt density at the target site by referring to the CT values of the samples, wherein more acurate results are obtained by compensating error factors due to blood, fat and the like. The method comprises: the step (D4) of scanning a target site and samples prepared by mixing a water equivalent with a standard bone-salt equivalent in various proportions under one or more tube voltages and replacing the CT value corresponding to the water equivalent included in the CT value of each sample by the CT value obtained by the scanning of the blood or a standard blood equivalent to calculate a corrected CT value, and either, in the scanning under a single tube voltage, the steps (D5 through D7) of determining the bone-salt density on the basis of the CT value of the target site by referring to the correct CT values, or, in the scanning under two or more tube voltages, the steps (D60 through D70) of determining the bone-salt density on the basis of the CT value of the target site while eliminating the influences of the fat and the like by referring to each corrected CT value.