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Sensitivity improvement of YAP(Ce) cameras for imaging of secondary electron bremsstrahlung X-rays emitted during carbon-ion irradiation: Problem and solution
https://repo.qst.go.jp/records/79400
https://repo.qst.go.jp/records/79400f3f59537-d2e5-4c1b-8fc4-b383c34226ba
| Item type | 学術雑誌論文 / Journal Article(1) | |||||
|---|---|---|---|---|---|---|
| 公開日 | 2020-02-26 | |||||
| タイトル | ||||||
| タイトル | Sensitivity improvement of YAP(Ce) cameras for imaging of secondary electron bremsstrahlung X-rays emitted during carbon-ion irradiation: Problem and solution | |||||
| 言語 | ||||||
| 言語 | eng | |||||
| 資源タイプ | ||||||
| 資源タイプ識別子 | http://purl.org/coar/resource_type/c_6501 | |||||
| 資源タイプ | journal article | |||||
| アクセス権 | ||||||
| アクセス権 | metadata only access | |||||
| アクセス権URI | http://purl.org/coar/access_right/c_14cb | |||||
| 著者 |
Seiichi, Yamamoto (Nagoya Univ.)
× Seiichi, Yamamoto (Nagoya Univ.)× Yamaguchi, Mitsutaka× Takashi, Akagi (Hyogo Ion Beam Medical Center)× Maki, Kitano (Nagoya Univ.)× Kawachi, Naoki× Yamaguchi, Mitsutaka× Kawachi, Naoki |
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| 抄録 | ||||||
| 内容記述タイプ | Abstract | |||||
| 内容記述 | Low-energy X-ray imaging of secondary electron bremsstrahlung X-rays emitted during carbon-ion irradiation is a promising method for range estimation and could be used for imaging with almost clinical dose levels of carbon ion. However, the number of counts in images with clinical dose levels is relatively small, making it difficult to obtain precise range estimations. Since improving the sensitivity of the X-ray camera may solve this issue, we developed two new types of X-ray cameras. One uses a 1-mm thick, 40 mm × 40-mm cerium-doped yttrium aluminum perovskite (YAP(Ce)) scintillator plate combined with a 2-inch square flat panel photomultiplier tube (FP-PMT) contained in a 2-cm thick tungsten shield with a pinhole collimator positioned 50 mm from the scintillator; the other uses a 0.5-mm thick, 20 mm × 20-mm YAP(Ce) scintillator plate combined with a 1-inch square position sensitive photomultiplier tube (PS-PMT) contained in the same tungsten shield with a pinhole collimator, but with the scintillator positioned closer (30 mm) to the pinhole collimator to obtain a similar field-of-view (FOV). For both cameras, we used a wider angle (~55 degrees) pinhole collimator to measure the phantom closer to improve sensitivity. Although the 40 mm × 40-mm YAP(Ce) camera had high system spatial resolution, the background count fractions were high and produced a high count area at the center of the images due to the pulse pileup of the signals. With the 20 mm × 20-mm YAP(Ce) camera, we obtained X-ray images with low background counts without a high count area at the image center. By smoothing the measured images, we were able to estimate the ranges even for clinical dose levels. We therefore confirmed that one of our newly developed YAP(Ce) cameras had high sensitivity and is promising for the imaging of secondary electron bremsstrahlung X-rays during irradiation of carbon ions in clinical conditions. | |||||
| 書誌情報 |
Phys. Med. Biol. 巻 65, 号 10, p. 105008-1-105008-15, 発行日 2020-03 |
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| 出版者 | ||||||
| 出版者 | IOP Publishing | |||||
| ISSN | ||||||
| 収録物識別子タイプ | ISSN | |||||
| 収録物識別子 | 0031-9155 | |||||
| DOI | ||||||
| 識別子タイプ | DOI | |||||
| 関連識別子 | 10.1088/1361-6560/ab7a6e | |||||
| 関連サイト | ||||||
| 識別子タイプ | URI | |||||
| 関連識別子 | https://iopscience.iop.org/article/10.1088/1361-6560/ab7a6e | |||||
