Optimization of a collimator size for the pin-hole camera of X-rays, and proposal of a method to correct degradations of efficiencies in neighboring parts of the image
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- HAYASHI Hiroaki
- Institute of Health Biosciences The University of Tokushima Graduate School
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- TANIUCHI Shou
- School of Health Science, The University of Tokushima
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- KAMIYA Naotaka
- School of Health Science, The University of Tokushima
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- NISHIHARA Sadamitsu
- Institute of Health Biosciences The University of Tokushima Graduate School
Bibliographic Information
- Other Title
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- X 線用のピンホールカメラに用いるコリメータ径の最適化と画像周辺部での検出効率低下の補正手法の提案
- Xセンヨウ ノ ピンホールカメラ ニ モチイル コリメータケイ ノ サイテキ カ ト ガゾウ シュウヘンブ デ ノ ケンシュツ コウリツ テイカ ノ ホセイ シュホウ ノ テイアン
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Abstract
A visual image of the scattered X-ray distributions gives us useful information for beginners to study radiation physics. A pin-hole camera for X-rays can be made by use of simple materials as well as a two-dimensional X-ray detector (imaging plate: IP). In contrast with a pin-hole camera for the visible radiations, a pin-hole camera for X-rays uses a collimator, having a sufficient thickness to reduce X-rays. This design causes the following problem: in the case in which the X-rays are incident to the collimator from the diagonal direction, the some X-rays are absorbed by the wall of the collimator. Namely, the images in the surrounding part of the IP are underrepresented. The aim of this study is to suggest a correction method of the underrepresentation. We used a pin-hole camera (320 mm(long)×270 mm(wide)×300 mm(depth)) by means of the clinically applied IP (10×12 inch). In order to determine proper conditions for a size of collimators (pin-hole), experiments using medical X-ray equipments were carried out. The efficiencies and resolutions were experimentally determined for the collimator sizes of 2 to 8 mmφ. Then, images of scattered X-ray distributions were measured by the irradiation of a head phantom, and considerations were taken for a practical use of the pin-hole camera. Moreover, an exponential absorption of X-rays in the phantom was visualized by our camera in order to indicate a potential of quantitative analysis based on the image of scattered X-ray distributions.<br>
Journal
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- Japanese Journal of Radiation Safety Management
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Japanese Journal of Radiation Safety Management 11 (1), 51-59, 2012
Japanese Society of Radiation Safety Management
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Keywords
Details 詳細情報について
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- CRID
- 1390001205226981632
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- NII Article ID
- 130001921567
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- NII Book ID
- AA11693866
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- ISSN
- 18849512
- 13471503
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- NDL BIB ID
- 023913667
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- Text Lang
- ja
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- Data Source
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- JaLC
- NDL
- CiNii Articles
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- Abstract License Flag
- Disallowed