title: Demonstration of enhanced iodine K-edge imaging using an energy-dispersive X-ray computed tomography system with a 25 mm/s-scan linear cadmium telluride detector and a single comparator.
abstract: An energy-dispersive (ED) X-ray computed tomography (CT) system is useful for carrying out monochromatic imaging. To perform enhanced iodine K-edge CT, we developed an oscillation linear cadmium telluride (CdTe) detector with a scan velocity of 25 mm/s and an energy resolution of 1.2 keV. CT is performed by repeated linear scans and rotations of an object. Penetrating X-ray photons from the object are detected by the CdTe detector, and event signals of X-ray photons are produced using charge-sensitive and shaping amplifiers. The lower photon energy is determined by a comparator device, and the maximum photon energy of 60 keV corresponds to the tube voltage. Rectangular-shaped comparator outputs are counted by a counter card. In the ED-CT, tube voltage and current were 60 kV and 0.30 mA, respectively, and X-ray intensity was 14.8 μGy/s at 1.0m from the source at a tube voltage of 60 kV. Demonstration of enhanced iodine K-edge X-ray CT for cancer diagnosis was carried out by selecting photons with energies ranging from 34 to 60 keV.
authors.affiliation: Department of Physics, Iwate Medical University, Yahaba, Iwate, Japan. dresato@iwate-med.ac.jp
authors.forename: Eiichi
authors.initials: E
authors.lastname: Sato
authors.forename: Yasuyuki
authors.initials: Y
authors.lastname: Oda
authors.forename: Abulajiang
authors.initials: A
authors.lastname: Abudurexiti
authors.forename: Osahiko
authors.initials: O
authors.lastname: Hagiwara
authors.forename: Hiroshi
authors.initials: H
authors.lastname: Matsukiyo
authors.forename: Akihiro
authors.initials: A
authors.lastname: Osawa
authors.forename: Toshiyuki
authors.initials: T
authors.lastname: Enomoto
authors.forename: Manabu
authors.initials: M
authors.lastname: Watanabe
authors.forename: Shinya
authors.initials: S
authors.lastname: Kusachi
authors.forename: Shigehiro
authors.initials: S
authors.lastname: Sato
authors.forename: Akira
authors.initials: A
authors.lastname: Ogawa
authors.forename: Jun
authors.initials: J
authors.lastname: Onagawa