Energy-discriminating X-ray computed tomography system utilizing a cadmium telluride detector

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• 作者：Eiichi Sato ; Purkhet Abderyim ; Toshiyuki Enomoto ; Manabu Watanabe ; Keitaro Hitomi ; Kiyomi Takahasi ; Shigehiro Sato ; Akira Ogawae ; Jun Onagawa
• 关键词：X-ray CT ; CdTe detector ; Photon counting ; Energy discrimination ; Enhanced iodine K-edge CT
• 刊名：Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
• 出版年：2010
• 出版时间：1 July 2010-21 July 2010
• 年：2010
• 卷：619
• 期：1-3
• 页码：262-265
• 全文大小：499 K

文摘

An energy-discriminating K-edge X-ray computed tomography (CT) system is useful for increasing contrast resolution of a target region utilizing contrast media and for reducing the absorbed dose for patients. The CT system is of the first-generation type with a cadmium telluride (CdTe) detector, and a projection curve is obtained by translation scanning using the CdTe detector in conjunction with an x-stage. An object is rotated by the rotation step angle using a turntable between the translation scans. Thus, CT is carried out by repeating the translation 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 using 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. Demonstration of enhanced iodine K-edge X-ray CT was carried out by selecting photons with energies just beyond the iodine K-edge energy of 33.2 keV.