Method for quantitatively determining bone mineral mass by CT system
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United States of America Patent
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May 28, 1996
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N/A
app pub date -
Nov 21, 1994
filing date -
May 29, 1992
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Abstract
A method for quantitatively determining bone mineral mass by a CT system, comprising scanning an objective region together with a plurality of samples produced by mixing a water equivalent material with various ratios of a standard material equivalent to bone mineral mass and determining the bone mineral density of the objective region with reference to the CT numbers of the samples, wherein a plurality of samples are scanned together with the objective region at one or multiple levels of tube voltage and a corrected CT number of each sample is calculated by substituting the CT number of each of the samples with the CT number of blood or a standard material equivalent to blood. By scanning at a single level of tube voltage, bone mineral density is determined, on the basis of the CT number of the objective region and with reference to the corrected CT numbers. On the other hand, by scanning at multiple levels of tube voltage, bone mineral density is determined on the basis of the CT number of the objective region and with reference to the corrected CT numbers while excluding the effect of fat. In the foregoing manner errors due to blood and fat are corrected.
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