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.
From the Departments of *Diagnostic Radiology and †Radiology, Hiroshima University, Minami-ku, Hiroshima, Japan; and ‡Toshiba Medical Systems Corporation, Otawara-shi, Tochigi, Japan.
Received for publication March 18, 2014; accepted May 19, 2014.
Reprints: Fuminari Tatsugami, MD, Department of Diagnostic Radiology, Hiroshima University, 1-2-3 Kasumi, Minami-ku, Hiroshima 734-8551, Japan (e-mail: email@example.com).
K.A. is currently receiving a research grant from Toshiba Medical Systems, Ltd. For the remaining authors, no conflicts of interest was declared.