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Measurement of Electron Density and Effective Atomic Number by Dual-Energy Scan Using a 320-Detector Computed Tomography Scanner with Raw Data-Based Analysis: A Phantom Study

Tatsugami, Fuminari MD*; Higaki, Toru PhD*; Kiguchi, Masao RT; Tsushima, So MSc; Taniguchi, Akira RT; Kaichi, Yoko MD*; Yamagami, Takuji MD*; Awai, Kazuo MD*

Journal of Computer Assisted Tomography: November/December 2014 - Volume 38 - Issue 6 - p 824–827
doi: 10.1097/RCT.0000000000000129
CT Physics and Technology
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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: sa104@rg8.so-net.ne.jp).

K.A. is currently receiving a research grant from Toshiba Medical Systems, Ltd. For the remaining authors, no conflicts of interest was declared.

© 2014 by Lippincott Williams & Wilkins