Investigation of quad-energy high-rate photon counting for X-ray computed tomography using a cadmium telluride detector
| Autor: | Osahiko Hagiwara, Shinya Kusachi, Yuichi Sato, Toshiyuki Enomoto, Eiichi Sato, Yasuyuki Oda, Manabu Watanabe, Hiroshi Matsukiyo, Satoshi Yamaguchi |
|---|---|
| Rok vydání: | 2017 |
| Předmět: |
010302 applied physics
Physics Radiation Photon business.industry Amplifier Detector 01 natural sciences Cadmium telluride photovoltaics Photon counting 030218 nuclear medicine & medical imaging 03 medical and health sciences 0302 clinical medicine Optics 0103 physical sciences Pinhole (optics) Tomography business Nuclear medicine Voltage |
| Zdroj: | Applied Radiation and Isotopes. 130:54-59 |
| ISSN: | 0969-8043 |
| Popis: | To obtain four kinds of tomograms at four different X-ray energy ranges simultaneously, we have constructed a quad-energy (QE) X-ray photon counter with a cadmium telluride (CdTe) detector and four sets of comparators and microcomputers (MCs). X-ray photons are detected using the CdTe detector, and the event pulses produced using amplifiers are sent to four comparators simultaneously to regulate four threshold energies of 20, 33, 50 and 65keV. Using this counter, the energy ranges are 20-33, 33-50, 50-65 and 65-100keV; the maximum energy corresponds to the tube voltage. We performed QE computed tomography (QE-CT) at a tube voltage of 100kV. Using a 0.5-mm-diam lead pinhole, four tomograms were obtained simultaneously at four energy ranges. K-edge CT using iodine and gadolinium media was carried out utilizing two energy ranges of 33-50 and 50-65keV, respectively. At a tube voltage of 100kV and a current of 60 μA, the count rate was 15.2 kilocounts per second (kcps), and the minimum count rates after penetrating objects in QE-CT were regulated to approximately 2 kcps by the tube current. |
| Databáze: | OpenAIRE |
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