| アイテムタイプ |
学術雑誌論文 / Journal Article(1) |
| 公開日 |
2023-07-03 |
| タイトル |
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タイトル |
Advantages of using larger-diameter pinhole collimator for prompt X-ray imaging during irradiation with carbon ions |
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言語 |
en |
| 言語 |
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言語 |
eng |
| 資源タイプ |
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資源タイプ識別子 |
http://purl.org/coar/resource_type/c_6501 |
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資源タイプ |
journal article |
| 著者 |
Seiichi Yamamoto (Nagoya Univ.)
Yabe Takuya
Takashi Akagi (Hyogo Ion Beam Medical Center)
Yamaguchi Mitsutaka
Kawachi Naoki
Kei Kamada (Tohoku Univ.)
Akira Yoshikawa (Tohoku Univ.)
Jun Kataoka (Waseda Univ.)
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| 抄録 |
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内容記述タイプ |
Abstract |
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内容記述 |
Prompt secondary electron bremsstrahlung X-ray (prompt X-ray) imaging using a low-energy X-ray camera is a promising method for observing a beam shape from outside the subject. However, the images measured within short times suffer from statistical noise. Consequently, we performed prompt X-ray imaging with higher sensitivity using a larger-diameter pinhole collimator and compared the results with those of a conventional collimator. Prompt X-ray imaging was conducted during irradiation with pencil beams of 241.5-MeV/n carbon ions to a water phantom. A newly developed X-ray camera with a 4-mm diameter as well as conventional 1.5-mm-diameter pinhole collimators was used for the imaging in list mode, and we compared the prompt X-ray images, energy spectra, and time count rate curves between 1.5-mm-diameter and 4-mm-diameter pinhole collimators. The prompt X-ray images taken with the 4-mm-diameter pinhole collimators had ?7 times higher sensitivity with 70 % lower offset fractions originating from the prompt gamma photons. Furthermore, the ranges were more precisely estimated with the 4-mm collimator than with the 1.5-mm collimator. The energy spectra showed less contamination by tungsten-characteristic X-rays for the 4-mm pinhole collimator. Even for images measured with 0.1-s intervals, the beam shapes and time count rate curves could be obtained with less statistical noise using the 4-mm-diameter pinhole collimators. The use of the 4-mm-diameter pinhole collimator attached to the X-ray camera had advantages for prompt X-ray imaging with high sensitivity and low background, enabling us to image the beams even with short-time measurements. |
| 書誌情報 |
Journal of Instrumentation (JINST)
巻 17,
p. P09006,
発行日 2022-09
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| 出版者 |
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出版者 |
IOP Publishing |
| ISSN |
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収録物識別子タイプ |
ISSN |
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収録物識別子 |
1748-0221 |
| DOI |
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識別子タイプ |
DOI |
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関連識別子 |
10.1088/1748-0221/17/09/P09006 |
