| Japanese |
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| Title | シンチカメラの計数率特性とアーティファクト |
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| Subtitle | 原著 |
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| Authors | 三枝健二*, 有水昇*, 中田常男**, 遠山春男**, 椎名勇** |
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| Organization | *千葉大学医学部放射線医学教室, **松戸市立病院放射線科 |
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| Journal | 核医学 |
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| Volume | 17 |
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| Number | 5 |
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| Page | 543-552 |
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| Year/Month | 1980/6 |
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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」RIアンギオグラフィなどボーラス状にRIを注入してシンチカメラ像を撮る場合, カメラによっては放射状のアーティファクトが見られる. この原因がカメラの計数率特性によるのか, 機種に特有であるのかを調べるため, 抵抗マトリックス方式2, 遅延電線方式3の計5台のカメラについて, 計数率特性およびアーティファクトの出方を測定した. その結果, 単一線源によるアーティファクトの出現は計数率特性よりも, 遅延電線方式のカメラで認められ, 機種に特有であることがわかった. ただ, 遅延電線方式でも計数率特性を著しく改善したカメラでは, アーティファクトの出方はかなり軽減されている. |
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| Practice | 臨床医学：一般 |
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| Keywords | scinti-camera, count rate characteristics, artifact image, bolus injection, dead time |
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| English |
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| Title | Counting Rate Characteristics and Artifacts Images of Scinti-cameras |
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| Subtitle | Original Articles |
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| Authors | Kenji SAEGUSA*, Noboru ARIMIZU*, Tsuneo NAKATA**, Haruo TOHYAMA**, Isamu SHIINA** |
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| Authors(kana) | |
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| Organization | *Department of Radiology, Chiba University School of Medicine, **Department of Radiology, Matsudo City Hospital |
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| Journal | The Japanese Journal of nuclear medicine |
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| Volume | 17 |
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| Number | 5 |
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| Page | 543-552 |
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| Year/Month | 1980/6 |
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| Article | Original article |
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| Publisher | THE JAPANESE SOCIETY OF NUCLEAR MEDICINE |
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| Abstract | [Summary] The radionuclide angiography or the cardiac shunt study defines a passage of high dose activity in a major blood vessels following intravenously injected bolus of 99mTc. And the bolus activity is projected on a small portion within the field of view of the detector for some short period of time. In this circumstance, the photon input rate to the detector is often much higher than that observed due to counting rate limitation of the camera system, and moreover delineation of artifact images has been often experienced. The purpose of this study is to survey the occurrences of count loss and artifact images encountered in high dose measurement and to examine either these causes are responsible for the lower counting rate characteristics of the scinti-camera, or proper to the scinti-camera system. The experiment and data were obtained for five scinti-cameras of the latest mode. 99mTc small size collimated sources were used similar to bolus activity, The result of the study showed the delineation of artifacts recognized only on delayline system scinti-cameras, in which the maximum counting rate was about 70 kcps to 110 kcps. However the artifact images were not obtained on resistor matrix system ones even at same high counting rate. We found that the delayline system scinti-camera began to delineate artifact on the image more than about 5 kcps, increasing intensities and extents as increasing counting rate. Although, the delayline system scinti-camera which has recently improved on an excellent counting rate characteristics, revealed less appearance of the artifact than that of former ones at more than 150 kcps measurement. In summary, the delayline system scinti-camera often delineate the artifact image of particular patterns in bolus injection of high dose activity. But, the artifact was less appearance in using latest improved scinti-camera with high counting rate performance. |
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| Practice | Clinical medicine |
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| Keywords | scinti-camera, count rate characteristics, artifact image, bolus injection, dead time |
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