PHANTOM FOR CALIBRATION AND DATA CALIBRATION METHOD

摘要

PURPOSE:To simultaneously execute the correction of the sensitivity between plural radiation detecting elements and the calibration of a quantitative analysis value with a quantitative analysis apparatus for a material consisting of these elements. CONSTITUTION:The phantom 5 for calibration is constituted of an acrylic plate 1 and a bone equiv. phantom 2 of a known Ca quantity. This phantom for calibration is so installed to the X-ray quantitative analysis apparatus that all the radiation detecting elements measure the intensity of the transmission X-rays of the bone equiv. phantom 2 part of the phantom 5 for calibration. This bone equiv. phantom scans an X-ray generator and the radiation detecting elements in synchronization. The correction factor of the sensitivity between the radiation detecting elements is calculated from the resulted data. The Ca quantity of the bone equiv. phantom 2 is determined in accordance with an energy differentiation method. The calibration factor of the quantitative analysis value is calculated from the relation between the calculated Ca quantity and the known Ca quantity. The correction factor of the sensitivity and the quantitative analysis value are easily obtd. by only one measurement.