| Japanese |
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| Title | Single Photon Emission Computed Tomographyによる左右心室容積算出のための基礎的検討 |
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| Subtitle | 原著 |
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| Authors | 滝淳一*, 分校久志*, 多田明*, 中嶋憲一*, 南部一郎*, 四位例靖*, 利波紀久*, 久田欣一* |
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| Organization | *金沢大学医学部核医学科 |
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| Journal | 核医学 |
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| Volume | 22 |
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| Number | 10 |
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| Page | 1539-1544 |
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| Year/Month | 1985/10 |
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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」 心電図同期Single Photon Emission Computed Tomography (SPECT) による左右心室容積算出のための基礎的検討を行った. 容積はカットオフ値による輪郭決定後, その内部のVoxel数より換算した. 種々の容積をもつ右室ファントムによる検討では, 最適カットオフ値 (C) はバックグラウンド (BG) が一定の場合は各容積により有意の変化を示さなかったが, BGの変化に伴って有意に変化した. 再構成画像におけるファントム内最高カウントに対するBGとCの間にはC=0.47・BG＋44.2 (%) (r=0.989) の良好な相関を認めた. この相関式に基づいてBGよりCを決定しファントムの容積算出を行ったところ, 真の容積の96±9.8%と良好な結果を得た. また10例の逆流および左右短絡のない臨床例ではSPECTによるStroke Volume Ratio (SVR) 1.05±0.10 (S.D.) となり同時に施行した従来の心電図同期心プールシンチグラフィにて求めたSVR 1.30±0.24に比較して1に近く変動も小さかった. 以上より本法は十分臨床応用可能であり単に心室容積の評価のみでなく逆流疾患や短絡疾患の評価にも応用可能と思われた. |
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| Practice | 臨床医学：一般 |
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| Keywords | Single photon emission computed tomography, Stroke volume ratio, Phantom, Ventricular volume |
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| English |
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| Title | Basic Evaluation of Right and Left Ventricular Volume Using Single-Photon Emission Computed Tomography |
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| Authors | Junichi TAKI, Hisashi BUNKO, Akira TADA, Kenichi NAKAJIMA, Ichiro NANBU, Yasushi SHIIRE, Norihisa TONAMI, Kinichi HISADA |
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| Organization | Department of Nuclear Medicine, Kanazawa University |
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| Journal | The Japanese Journal of nuclear medicine |
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| Volume | 22 |
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| Number | 10 |
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| Page | 1539-1544 |
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| Year/Month | 1985/10 |
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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 new method for the measurement of right and left ventricular volumes using single photon emission computed tomography (SPECT) was evaluated in phantom and patients. After reconstructing ventricular tomographic slices, ventricular perimeters were determined using a certain threshold level (% of maximum count in the chamber) . The ventricular volumes were then calculated based on the number of voxels of interest (VOI) . Since optimal threshould levels for delineating perimeters were considered to be influenced by the background (BG) and the ventricular volume, the relations among these factors were studied. When BGs were constant, optimal threshold levels were not affected significantly by the volume of the chamber. However, optimal threshold levels (T optimal) have linear correlation with BG levels ; that is : T optimal=0.47 BG+44.2 (%) , r=0.989. Using this equation for the various volume of phantom, the relative estimated ventricular volume was 96+-9.8% (S.D.) . In 10 patients without both regurgitation and shunt, stroke volume (SV) ratio (LV/RV) determined by this method were compared with that obtained using conventional planar gated blood pool study (GBPS) . SV ratio based on the planar GBPS was 1.3+-0.24 (S.D.) , while that based on the SPECT was 1.05+-0.10. In conclusion our method for the determination of ventricular volume using SPECT was reliable and clinically applicable. |
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| Practice | Clinical medicine |
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| Keywords | Single photon emission computed tomography, Stroke volume ratio, Phantom, Ventricular volume |
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