| Japanese |
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| Title | POSITOLOGICA IIによる心電図同期ポジトロンCT - 加算パルス数と復元誤差の関係を中心に - |
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| Subtitle | 原著 |
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| Authors | 遠藤真広*, 松本徹*, 氷見寿治**, 飯沼武*, 山崎統四郎*, 舘野之男*, 吉田勝哉**, 加賀谷秋彦**, 増田善昭**, 稲垣義明**, 大串明***, 井上慎一*** |
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| Authors(kana) | |
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| Organization | *放射線医学総合研究所臨床研究部, **千葉大学医学部第三内科学教室, ***(株)日立メディコ |
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| Journal | 核医学 |
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| Volume | 25 |
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| Number | 3 |
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| Page | 223-229 |
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| Year/Month | 1988/3 |
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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」心ポジトロンCTにおける心臓の動きの影響を除去するため, POSITOLOGICA IIを用いて心電図同期データ収集を行う方式を開発した. 本方式では心電波形に同期して2つの時相(例えば拡張末期と収縮末期)のデータが指定心拍数だけ収集され, 画像復元される. データサンプリングの不均一性にもとづく復元誤差を評価するため, 固定線源のパルス同期と非同期の撮像を行い, 誤差の解析を行った. その結果, データサンプリングの不均一性にもとづく復元誤差は非常に少ない加算パルス数では支配的であるが, 加算パルス数を増加すると急激に減少し, 臨床使用条件では, 統計ノイズに対して無視できることがわかった. 正常例にN-13アンモニアを投与して, 心電図同期ポジトロンCTを施行したところ, 壁運動と壁厚の時相による変化を検出できた. |
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| Practice | 臨床医学：一般 |
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| Keywords | Positron emission tomography, Electrocardiographic gating, Reconstruction error. |
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| English |
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| Title | Electrocardiographic Gated Positron Emission Tomography with POSITOLOGICA II - Relationship between Accumulated Pulses and Reconstruction Errors - |
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| Subtitle | Original Articles |
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| Authors | Masahiro ENDO*, Toru MATSUMOTO*, Toshiharu HIMI**, Takeshi A. IINUMA*, Toshiro YAMASAKI*, Yukio TATENO*, Katsuya YOSHIDA**, Akihiko KAGAYA**, Yoshiaki MASUDA**, Yoshiaki INAGAKI**, Akira OGUSHI***, Sinichi INOUE*** |
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| Authors(kana) | |
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| Organization | *Division of Clinical Research, National Institute of Radiological Sciences, **Third Department of Internal Medicine, Chiba University School of Medicine, ***Hitachi Medical Corporation |
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| Journal | The Japanese Journal of nuclear medicine |
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| Volume | 25 |
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| Number | 3 |
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| Page | 223-229 |
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| Year/Month | 1988/3 |
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| Article | Original article |
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| Publisher | THE JAPANESE SOCIETY OF NUCLEAR MEDICINE |
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| Abstract | [Summary] Electrocardiographic (ECG) synchronized multiple gated data acquisition was employed with POSITOLOGICA II, a whole body positron emission tomograph to avoid blurring of cardiac image due to heart motion. Coincidence events at two cardiac phases (end-systole and end-diastole for example) are collected during predetermined cardiac cycles and then reconstructed. Delay time from triggering R-pulse can be varied 0-999 msec and data sampling time can be varied 10-999 msec. Fixed radiation sources were imaged with and without gating, and reconstruction errors of the both images were compared to evaluate the magnitude of errors due to non-uniform sampling caused by the gated data acquisition. The result was that although the reconstruction errors due to non-uniform sampling were dominant at very small numbers of accumulated pulses, they rapidly decreased with the increased number of pulses and became negligible to statistical noises at clinical conditions. Gated cardiac images of a normal case was taken after intravenous injection of N-13 ammonia solution. Left ventricular wall motion and changes of wall thickness were readily apparent in the gated images. |
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| Practice | Clinical medicine |
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| Keywords | Positron emission tomography, Electrocardiographic gating, Reconstruction error. |
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