| Japanese |
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| Title | ガンマ・カメラによるDual Photon Absorptiometry装置の開発 |
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| Subtitle | 研究速報 |
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| Authors | 友光達志*, 福永仁夫*, 大塚信昭*, 曾根照喜*, 永井清久*, 小野志磨人*, 古川高子*, 柳元真一*, 村中明*, 森田陸司*, 鳥塚莞爾** |
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| Authors(kana) | |
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| Organization | *川崎医科大学核医学科, **京都大学医学部放射線核医学科 |
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| Journal | 核医学 |
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| Volume | 23 |
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| Number | 5 |
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| Page | 499-503 |
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| Year/Month | 1986/5 |
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| Article | 報告 |
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| Publisher | 日本核医学会 |
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| Abstract | 「I. はじめに」現在, ガンマ線吸収測定法による骨塩定量法として, 線源に125Iを用いるsingle photon absorptiometryや, 2つの異なったエネルギーのγ線を放出する153Gdを線源に用いるdual photon absorptiometry (DPA) が行われている. 前者は橈骨を対象とするのに対し, 後者は骨塩量の変化が著明な腰椎を測定できる利点がある. 従来のDPA装置はすべてスキャナ方式であるが, 今回, ガンマ・カメラ方式による装置を開発し, 基礎的検討を行ったので報告する. 「II. 装置の概要」装置の概要は, Fig.1に示すように, 検出器にはNaI (Tl) シンチレータ (直径12.7cm, 厚さ0.51cm) と19本の光電子増倍管 (直径3.81cm) を使用し, コリメータにはX線撮影用クロスグリッド (グリッド比=10:1, 焦点距離55cm) を用いた. |
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| Practice | 臨床医学：一般 |
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| Keywords | Dual photon absorptiometry, 153Gd, Bone mineral content, Gamma camera |
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| English |
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| Title | Development of Instrument System of Dual Photon Absorptiometry Using a Gamma Camera |
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| Subtitle | Rapid Communication |
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| Authors | Tatsushi TOMOMITSU*, Masao FUKUNAGA*, Nobuaki OTSUKA*, Teruki SONE*, Kiyohisa NAGAI*, Shimato ONO*, Takako FURUKAWA*, Akira MURANAKA*, Shinichi YANAGIMOTO*, Rikushi MORITA*, Kanji TORIZUKA** |
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| Authors(kana) | |
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| Organization | *Department of Nuclear Medicine, Kawasaki Medical School, **Department of Radiology and Nuclear Medicine, Kyoto University |
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| Journal | The Japanese Journal of nuclear medicine |
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| Volume | 23 |
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| Number | 5 |
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| Page | 499-503 |
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| Year/Month | 1986/5 |
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| Article | Report |
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| Publisher | THE JAPANESE SOCIETY OF NUCLEAR MEDICINE |
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| Abstract | [Summary] We have developed a new instrument system of dual photon absorptiometry using a gamma camera for the evaluation of bone mass in spine. The system consisted of 153Gd as an emitting source, NaI crystal, 19 photomultiplier tubes and a computer. The precision of the system at the measuring time of 9 and 15 min. in pig bone was found to be good (CV of less than 2%), and the accuracy in an experiment using a bone equivalent material (K2HPO4 solution) was also high (r=0.988, p<0.001). An advantage of the gamma camera system over the scanning system was as follows ; the amount of 153Gd used in the gamma camera system was one tenth of that required for the scanning system. Thus the dual photon absorptiometry using gamma camera could be thought to hold great promise as an investigative tool in quantifing bone mass. |
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| Practice | Clinical medicine |
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| Keywords | Dual photon absorptiometry, 153Gd, Bone mineral content, Gamma camera |
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