کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1886070 | 1533524 | 2014 | 7 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Zero-dark-counting X-ray photon detection using a YAP(Ce)-MPPC detector and its application to computed tomography using gadolinium contrast media
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
فیزیک و نجوم
تشعشع
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![عکس صفحه اول مقاله: Zero-dark-counting X-ray photon detection using a YAP(Ce)-MPPC detector and its application to computed tomography using gadolinium contrast media Zero-dark-counting X-ray photon detection using a YAP(Ce)-MPPC detector and its application to computed tomography using gadolinium contrast media](/preview/png/1886070.png)
چکیده انگلیسی
To measure X-ray spectra and to perform photon-counting computed tomography (PC-CT) with high count rates, we developed a zero-dark-counting spectrometer using a short-decay-time scintillator. A method exploiting a YAP(Ce) [cerium-doped yttrium aluminum perovskite] single crystal scintillator with a decay time of 30 ns and an MPPC (multipixel photon counter) has been developed to count X-ray photons. The photocurrent from the MPPC was amplified by a high-speed current-voltage amplifier, and the event pulse was sent to a multichannel analyzer (MCA) to measure X-ray spectra. The MPPC was driven under pre-Geiger mode at a bias voltage of the MPPC of 70.7 V and a temperature of 23 °C. The PC-CT was accomplished by repeated linear scans and rotations of an object, and projection curves of the object were obtained by the linear scan at a tube current of 1.0 mA. The exposure time for obtaining a tomogram was 10 min at a scan step of 0.5 mm and a rotation step of 1.0°. At a tube voltage of 100 kV, the maximum count rate was 200 kcps. In the PC-CT using gadolinium media, we observed image-contrast variations with changes in lower-level discrimination voltage of the event pulse using a comparator.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Radiation Physics and Chemistry - Volume 100, July 2014, Pages 1-7
Journal: Radiation Physics and Chemistry - Volume 100, July 2014, Pages 1-7
نویسندگان
Syouta Kami, Eiichi Sato, Hayato Kogita, Wataru Numahata, Tatsuki Hamaya, Shinichi Nihei, Yumeka Arakawa, Yasuyuki Oda, Hajime Kodama, Osahiko Hagiwara, Hiroshi Matsukiyo, Akihiro Osawa, Toshiyuki Enomoto, Manabu Watanabe, Shinya Kusachi, Shigehiro Sato,