| Japanese |
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| Title | スリットコリメーター付NaI検出器の計数率特性 |
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| Subtitle | 原著 |
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| Authors | 西沢邦秀*, 田宮正** |
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| Organization | *名古屋大学医学部放射線医学教室 (主任 : 高橋信次教授), **名古屋大学医学部附属病院中央放射線部 (部長 : 高橋信次教授) |
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| Journal | 核医学 |
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| Volume | 10 |
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| Number | 6 |
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| Page | 531-537 |
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| Year/Month | 1973/12 |
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| Article | 原著 |
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| Publisher | 日本核医学会 |
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| Abstract | 「1. はじめに」前報においてγ核種に対し, 内部被曝の評価を行うためにシンチスキャン法で体内に摂取された放射性同位元素(RI)の位置と量を決める系統的な方法を提案した. この方法を実際に応用するためには多くの問題を解決しなければならない. ここではそのうちの1つである非焦点型矩形スリットコリメーターを装着した検出器の計数率特性について述べる. 「2. 研究方法と結果」「2.1. 研究方法」非焦点型矩形スリットコリメーターの矩形の短辺を体軸に平行に置く. 体内RIの分布を体軸方向とこれに垂直な横断面(S面)との分布にわけて考えたのに応じてコリメーターの特性も短辺に平行な体軸上と, 長辺に平行なS面内の計数率特性とに分けて実験と計算とで検討した. 長辺は円とみなされたS面全体がクリスタルの有効視野に入る長さを持つものとする. 「2.2. S面内での計数率特性」「実験1」長さ50cm, 半径10cmのプラスチック製円筒型水ファンートム中に203Hgの点線源を置き, これを短辺2.25cm, 長辺20cm, 深さ12.5cm, 厚さ鉛4cm+鉄10cmのスリットを通し2 inch NaI検出器と400 channel波高分析装置により計測した. |
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| Practice | 臨床医学：一般 |
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| English |
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| Title | Characteristic of NaI Detector with a Collimator of Unfocussed Rectangular Slit |
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| Subtitle | Original |
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| Authors | Kunihlde NISHIZAWA, Tadashi TAMIYA |
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| Organization | Department of Radiology, Nagoya University School of Medicine |
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| Journal | The Japanese Journal of nuclear medicine |
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| Volume | 10 |
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| Number | 6 |
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| Page | 531-537 |
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| Year/Month | 1973/12 |
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| Article | Original article |
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| Publisher | THE JAPANESE SOCIETY OF NUCLEAR MEDICINE |
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| Abstract | [Summary] A NaI detector with a collimator of unfocussed rectangular slit is often employed in quantitative measurement of radionuclide distribution in human body for the purpose of internal absorbed dose calculation. In this paper, two characteristics of this collimator-detector system are studied: (1) resolution along the body axis and (2) relative counting efficiency within the axial transverse section. Point spread function was calculated from the geometrical configulation of the collimator-detector system and compared with the experiment. It was found that experimental point spread function was well fitted by Gaussian function, but does not agree with the calculated one. The relative counting efficiency in transverse section was calculated for circular cross section in water of several different diameters and also compared with experimental results under similar geometric conditions. It was shown that results of the calculation and the experiment were in good agreement. From these results, it may be concluded that this type of collimator is useful for quantitative assessment of radionuclide distribution in vivo, but further investigation is necessary on depth dependence of the resolution. |
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| Practice | Clinical medicine |
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