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

✍ Scribed by Eiichi Sato; Purkhet Abderyim; Toshiyuki Enomoto; Manabu Watanabe; Keitaro Hitomi; Kiyomi Takahasi; Shigehiro Sato; Akira Ogawae; Jun Onagawa

• Publisher: Elsevier Science
• Year: 2010
• Tongue: English
• Weight: 500 KB
• Volume: 619
• Category: Article
• ISSN: 0168-9002
• DOI: 10.1016/j.nima.2009.10.087

✦ Synopsis

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.