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| Title | EVALUATION OF SCINTILLATION CAMERA PERFORMANCE FOR LOW-CONTRAST OBJECTS |
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| Subtitle | Original Articles |
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| Authors | Ken UEDA*, Kenji ISHIMATSU** |
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| Organization | *Hitachi Central Research Loboratory, Hitachi Ltd., **Hitachi Medical Corporation |
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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 | 167-174 |
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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] Scintillation camera imaging performance for low-contrast 99mTc or 131I distribution patterns is investigated theoretically. The present method is based on an evaluation of "scinti-photo resolution", which is a complex function of the intrinsic resolution and sensitivity of the camera, collimator performance, imaging time, radioactivity and object pattern contrast. A "characteristic curve" is defined as the relation between distance to be resolved and the minimum product of radioactivity and imaging time. A mathematical expression of the curve is derived from an expansion of the semi-empirical expression which has been confirmed experimentally for bar-phantom images. Typical characteristic curves for recent high-resolution systems are represented. An optimum collimator selection method is described by comparing characteristic curves for different collimators. Next, the effects of intrinsic spatial resolution change and detection sensitivity change on characteristic curves are examined. The former and latter are determinant factors for 99mTc and 131I imaging, respectively. Comparative evaluation among different systems appears to be basically unaffected by the object contrast. |
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| Practice | Clinical medicine |
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| Keywords | Comera performance for low-contrast |
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| Japanese |
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| Title | 低コントラスト被写体に対するシンチカメラ性能の評価 |
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| Subtitle | 原著 |
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| Authors | 植田健*, 石松健二** |
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| Organization | *(株)日立製作所中央研究所, **(株)日立メディコ |
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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 | 167-174 |
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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」シンチグラムの解像度に関する特性曲線 (バーファントム幅と, それを見分けるに必要なRI投与量 (a) と撮像時間 (T) との積 (aT) との関係) 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RI分布が低濃度差である被写体に対して理論的に検討した. 99mTcおよび131Iに対して, 被写体コントラスト, シンチグラム解像度, および撮像条件 (aT) の3因子の2因子を指定したときに, 検出器の解像度に応じて最適なコリメータを選択する方法を示した. 最適コリメーターの選定は, 被写体コントラストにはほとんど影響されないが, 同一aT値のときのシンチグラム解像度に対するコントラストの影響は大きい. 検出器の解像度および検出効率 (シンチレーター厚) の変化が特性曲線に与える影響を定量化した結果, 同一の解像度を得るに必要なaT値の大きさには, 99mTcでは前者が, 131Iでは後者が支配的であった. |
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| Practice | 臨床医学：一般 |
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| Keywords | Comera performance for low-contrast |
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