| Japanese |
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| Title | 甲状腺専用コンバージングコリメータの試作 |
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| Subtitle | 原著 |
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| Authors | 尾川浩一*, 橋本順*, 久保敦司*, 橋本省三*, 鈴木謙三**, 類家俊充*** |
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| Authors(kana) | |
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| Organization | *慶應義塾大学医学部放射線医学教室, **東京都立駒込病院放射線科, ***東芝那須工場特機装置部核医学 |
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| Journal | 核医学 |
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| Volume | 27 |
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| Number | 4 |
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| Page | 303-311 |
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| Year/Month | 1990/4 |
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| Article | 原著 |
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| Publisher | 日本核医学会 |
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| Abstract | 「要旨」 腫瘍性病変の映像化を目的とした甲状腺シンチグラムにおいては, ピンホール型あるいは平行多孔型のコリメータを使用する場合が多いが, これらの方法では撮像系に依存した歪みが生じ, 甲状腺辺縁部のコントラスト分解能が低下するという問題があった. この問題点を解決するために短焦点距離を持つ甲状腺専用コンバージング型コリメータを考案し, その有用性について計算機シミュレーションで確認し, 試作を行った. このコリメータを用いた基礎実験ならびに臨床応用の結果, 他の上記2種類のコリメータと比較して, 同一の収集時間, 拡大率という条件のもとで辺縁部の欠損の検出率に明らかな改善が認められた. |
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| Practice | 臨床医学：一般 |
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| Keywords | Converging collimator, Thyroid imaging, Scintillation camera |
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| English |
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| Title | Development of a Converging Collimator for Thyroid Scintigraphy |
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| Subtitle | Original Articles |
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| Authors | Koichi OGAWA*, Jun HASHIMOTO*, Atsushi KUBO*, Shozo HASHIMOTO*, Kenzo SUZUKI**, Toshimitsu RUIKE*** |
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| Authors(kana) | |
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| Organization | *Department of Radiology, School of Medicine, keio University, **Department of Radiology, Komagome Metropolitan Hospital, ***Medical Systems Division, Nasu Works, Toshiba Corporation |
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| Journal | The Japanese Journal of nuclear medicine |
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| Volume | 27 |
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| Number | 4 |
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| Page | 303-311 |
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| Year/Month | 1990/4 |
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| Article | Original article |
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| Publisher | THE JAPANESE SOCIETY OF NUCLEAR MEDICINE |
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| Abstract | [Summary] Thyroid scintigraphy is generally performed using a pin-hole or a parallel-hole collimator. The former yields a high resolution image, however, the acquisition time prolongs because the collimation system magnifies a thyroid image. The latter has somewhat low resolution, because the collimation system cannot magnify the thyroid image and it is difficult to close the collimator surface to a patient thyroid. The defects of the above two collimators are distortion or blurs at the thyroid edge of the acquired image. To improve the image quality of the thyroid scintigram, we made computer simulations concerning contrast resolution in comparison of a parallel-hole, pin-hole and converging collimator. The simulations results showed that the contrast resolution by the converging collimator is superior to the other collimators. According to the results, we developed a speciallydesigned converging collimator (thickness : 100mm, focal length : 195mm) . We cut an edge of the collimator to decrease the distance between the neck and the collimator surface. Under almost the same conditions for spatial resolution and sensitivity, we compared the effectiveness of the converging collimator with that of the other two collimators ; the pin-hole type [medium resolution] and the parallel-hole type [high resolution] . As a result of experiments using a phantom, the converging collimator showed less distortion compared with the other collimators at the deep area of the thyroid phantom. This is caused by the geometrical situation of the hole alignment and the thyroid position. The results of the clinical evaluation also showed that the converging collimator better accomplished high contrast resolution than did the other two collimators. |
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| Practice | Clinical medicine |
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| Keywords | Converging collimator, Thyroid imaging, Scintillation camera |
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