| Japanese |
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| Title | Double hole honeycomb collimator (第1報) |
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| Subtitle | 原著 |
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| Authors | 丹羽克味*, 伊藤康裕*, 岡本庄二*, 菅野久美子*, 加藤紘一** |
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| Organization | *東京歯科大学歯科放射線学教室, **日立レントゲン株式会社柏工場 |
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| Journal | 核医学 |
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| Volume | 10 |
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| Number | 1 |
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| Page | 1-7 |
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| Year/Month | 1973/2 |
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| Article | 原著 |
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| Publisher | 日本核医学会 |
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| Abstract | 「I. 諸言」現在臨床に使用されているscintiscannerの解像力は, ほぼ1.0lines/cmぐらいであろうと考えられる. だが臓器中に存在する病巣を陰性所見としてscintigram上で診断するとなると, まだまだ満足すべき画像が得られていない現状である. scintiscannerの解像力についての研究はかなり多数にみられ, その一つにBenderらの報告に球形欠損描記における最も重要なfactorはγ線エネルギーであるという意見もある. しかし核種が定まれば少しでも情報量の多いscintigramを得るためには, collimatorの良否がその鍵を握っているといえる. 我々もscintiscannerの解像力の決め手であるhoneycomb collimatorについて, その解像力と鮮鋭度の向上を目的として研究を行なってきた. それらの結果から高感度で高解像力を期待できる新しいhoneycomb collimatorを試作したのでここに報告する. |
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| Practice | 臨床医学：一般 |
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| English |
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| Title | Double hole honeycomb collimater (1 report) |
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| Subtitle | Original |
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| Authors | Katsumi NIWA, Yasuhiro ITO, Shoji OKAMOTO, Kumiko KANNO1), Koichi KATO2) |
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| Organization | 1)Department of Dental Radiology, Tokyo Dental College, 2)Hitachi Roentgen Co. Ltd. |
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| Journal | The Japanese Journal of nuclear medicine |
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| Volume | 10 |
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| Number | 1 |
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| Page | 1-7 |
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| Year/Month | 1973/2 |
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| Article | Original article |
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| Publisher | THE JAPANESE SOCIETY OF NUCLEAR MEDICINE |
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| Abstract | For the providing the honeycomb collimator, with a higher sensitivity and higher resolving power than those of the usual ones, we have developed a new concept of honeycomb collimator. It is a double hole honeycomb collimator, because the modification consists of inserting a lead tube in each hole of the usual collimator, the diameter of which being 1/3of the hole containing it. By this device the penumbral gamma rays are absorbed by these lead tubes. The on-focus gamma rays will effect the reducation of the effective area to the extent of the thickness of the tube. By increasing the diameter of the holes, it is presumed to be possible to make a collimator which has a better resolving power, and a similar degree of sensitivity, to those of the usual 37 holes honeycomb collimator. This time a 19 holes double hole honeycomb collimator was prepared, and its sensitivity and resolving power were compared to usual 37 holes one by means of MTF. The crystal diameter was 3 inches. Results; Using 99mTc, the value of MTF of 37 holes one and 19 holes double hole one at 0.6lines/cm were 1.4and 2.9 respectively. As to the sensitivity determined with point source, 19 holes double hole one was 18.8%higher than 37 holes one. |
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| Practice | Clinical medicine |
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