Demonstration of iodine K-edge imaging by use of an energy-discrimination X-ray computed tomography system with a cadmium telluride detector.
An energy-discrimination K-edge X-ray computed tomography (CT) system is useful for increasing the contrast resolution of a target region by utilizing contrast media. The CT system has a cadmium telluride (CdTe) detector, and a projection curve is obtained by linear scanning with use of the CdTe detector in conjunction with an X-stage. An object is rotated by a rotation step angle with use of a turntable between the linear scans. Thus, CT is carried out by repetition of the linear scanning and the rotation 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 with use of charge-sensitive and shaping amplifiers. Both the photon energy and the energy width are selected by use of a multi-channel analyzer, and the number of photons is counted by a counter card. For performing energy discrimination, a low-dose-rate X-ray generator for photon counting was developed; the maximum tube voltage and the minimum tube current were 110 kV and 1.0 microA, respectively. In energy-discrimination CT, the tube voltage and the current were 60 kV and 20.0 microA, respectively, and the X-ray intensity was 0.735 microGy/s at 1.0 m from the source and with a tube voltage of 60 kV. Demonstration of enhanced iodine K-edge X-ray CT was carried out by selection of photons with energies just beyond the iodine K-edge energy of 33.2 keV.
Abudurexiti
Abulajiang
A
Faculty of Software and Information Science, Iwate Prefectural University, 152-52 Sugo, Takizawa, 020-0193, Japan. g236e001@edu.soft.iwate-pu.ac.jp
Kameda
Masashi
M
Sato
Eiichi
E
Abderyim
Purkhet
P
Enomoto
Toshiyuki
T
Watanabe
Manabu
M
Hitomi
Keitaro
K
Tanaka
Etsuro
E
Mori
Hidezo
H
Kawai
Toshiaki
T
Takahashi
Kiyomi
K
Sato
Shigehiro
S
Ogawa
Akira
A
Onagawa
Jun
J
D000818:Animals; D019187:Cadmium Compounds; D004285:Dogs; D004428:Ear Neoplasms / Q000000981:diagnostic imaging; D006321:Heart / Q000000981:diagnostic imaging; D006801:Humans; D007455:Iodine; D019047:Phantoms, Imaging; D011817:Rabbits; D011829:Radiation Dosage; D013691:Tellurium; D014057:Tomography, X-Ray Computed / Q000295:instrumentation* / Q000379:methods
D019187:Cadmium Compounds; D007455:Iodine; D013691:Tellurium; C028337:cadmium telluride
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