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| Title | SCINTI-PHOTO RESOLUTION AND EVALUATION OF SCINTILLATION CAMERA SYSTEM |
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| Subtitle | Original Articles |
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| Authors | Kenji ISHIMATSU*, Ken UEDA**, Masatoshi TANAKA*, Nobuyuki MUKAI* |
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| Organization | *Hitachi Medical Corporation, **Hitachi Central Research Laboratory, Hitachi Ltd. |
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| Journal | The Japanese Journal of nuclear medicine |
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| Volume | 16 |
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| Number | 2 |
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| Page | 159-166 |
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| Year/Month | 1979/4 |
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| Article | Original article |
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| Publisher | THE JAPANESE SOCIETY OF NUCLEAR MEDICINE |
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| Abstract | [ABSTRACT] Spatial resolution of scintigram is affected by the performance of scintillation camera system, conditions for imaging and parameters of object, and is represented by critically resolvable distance between two adjacent bars in a scinti-photo of bar phantom by human eyes. The scinti-photo resolution thus defined is theoretically related with the performance of scintillation camera system and conditions for imaging : i.e. resolution and sensitivity of scintillation camera itself, activity level of radioisotope and imaging time with given parameters of object. This relation is applied to the evaluation of scintillation camera system. Firstly, the optimum collimator for a given scintillation camera can be determined when activity level and imaging time are given, and secondly, a definite evaluation of scintillation camera can be made in relation to its resolution and sensitivity, Finally, both experimental and theoretical evaluations were carried out with four commercially available scintillation camera systems. The experimental resuts are in a good agreement with the theoretical ones, and they indicate that a thinner scintillation crystal does not always result in poorer system performance. |
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| Practice | Clinical medicine |
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| Keywords | Scintigram resolution |
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| Japanese |
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| Title | シンチフォトの分解能とシンチカメラシステムの評価 |
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| Subtitle | 原著 |
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| Authors | 石松健二*, 植田健**, 田中正敏*, 向井信之* |
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| Organization | *(株)日立メディコ, **(株)日立製作所中央研究所 |
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| Journal | 核医学 |
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| Volume | 16 |
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| Number | 2 |
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| Page | 159-166 |
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| Year/Month | 1979/4 |
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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」シンチレーションカメラシステムで得られるシンチグラムの解像度は, 装置自体の解像度と感度以外に, RI投与量 (a) と撮影時間 (T) が関与する. すなわち, 上記aとTの積とシンチグラムの解像度との関係を表わす特性曲線は, 検出器およびコリメータの感度と解像度によって決定される. この特性曲線を理論的に検討し, 特性曲線が使用条件に応じたコリメータの選択やカメラの評価に利用できることを示した. 次に, 4機種のシンチレーションカメラシステムについて, バーファントム解像度を実験的に評価した. 実験データによる特性曲線は, 計算結果と実験誤差の範囲内で一致した. 低エネルギー核種では, 装置の感度の改善よりも解像度の改善の方がシンチグラムの向上に大きく寄与することが結論された. |
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| Practice | 臨床医学：一般 |
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| Keywords | Scintigram resolution |
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