title: 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.
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.
authors.affiliation: From the Departments of *Diagnostic Radiology and †Radiology, Hiroshima University, Minami-ku, Hiroshima, Japan; and ‡Toshiba Medical Systems Corporation, Otawara-shi, Tochigi, Japan.
authors.forename: Fuminari
authors.initials: F
authors.lastname: Tatsugami
authors.forename: Toru
authors.initials: T
authors.lastname: Higaki
authors.forename: Masao
authors.initials: M
authors.lastname: Kiguchi
authors.forename: So
authors.initials: S
authors.lastname: Tsushima
authors.forename: Akira
authors.initials: A
authors.lastname: Taniguchi
authors.forename: Yoko
authors.initials: Y
authors.lastname: Kaichi
authors.forename: Takuji
authors.initials: T
authors.lastname: Yamagami
authors.forename: Kazuo
authors.initials: K
authors.lastname: Awai
mesh_terms: D004583:Electrons; D019047:Phantoms, Imaging; D015900:Radiography, Dual-Energy Scanned Projection; D015898:Tomography Scanners, X-Ray Computed