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Measurement of electron density and effective atomic number by dual-energy scan using a 320-detector computed
Fuminari Tatsugami1, Toru Higaki, Masao Kiguchi
1From the Departments of *Diagnostic Radiology and †Radiology, Hiroshima University, Minami-ku, Hiroshima, Japan; and ‡Toshiba Medical Systems Corporation, Otawara-shi, Tochigi, Japan.
Abstract:
We evaluated the accuracy of the electron densities and effective atomic numbers determined by raw data-based dual-energy analysis on a 320-detector computed tomography scanner. The mean (SD) errors between the measured and true electron densities and between the measured and true effective atomic numbers were 1.3% (1.5%) and 3.1% (3.2%), respectively. Electron densities and effective atomic numbers can be determined with high accuracy, which may help to improve accuracy in radiotherapy treatment planning.
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