Japanese
Title心拍同期心プール断層法による左室容積, 駆出率, 1回心拍出量算出の精度について
Subtitle原著
Authors山岸隆*, 佐々田孝美**, 前田準也**, 河野隆任**, 吉永憲正**, 小川宏*, 松田泰雄*, 尾崎正治*, 楠川禮造*
Authors(kana)
Organization*山口大学医学部第二内科, **徳山中央病院
Journal核医学
Volume26
Number2
Page155-164
Year/Month1989/2
Article原著
Publisher日本核医学会
Abstract「要旨」 各種心疾患患者23名を対象に左室容積と駆出率を心拍同期心プール断層法(MGBPT)と左室造影法で求め, MGBPT法の精度について検討した. Tc-99m-HSAを静注後, ガンマカメラを180度回転させ1方向60秒間で18方向より撮像した. 左室水平長軸断層像より拡張末期像と収縮末期像を作成した. 容積算出は断層像の最大カウント値に対する%カットオフ値を設定し, 左室辺縁を描出した後に左室断層像内のvoxel数を全断層像において合計し, これにあらかじめ実測した1voxelの体積を乗じ左室容積を算出した. %カットオフ値はファントム実験より42%とした. MGBPT法と左室造影法より算出した容積の比較でr=0.82, SEE=29mlの良好な相関があった. 同様に左室駆出率もr=0.73, SEE=9.6%の良好な相関があった. しかし, 左室造影法とMGBPT法の間の誤差は左室容積が少ないほど大きく, 特に50ml以下になると著明に大きくなった.
Practice臨床医学：一般
KeywordsMultigated blood pool tomography, Volume measurements
English
TitleAccuracy of the Measurements of Left Ventricular Volume and Ejection Fraction Determined from Multigated Blood Pool Tomogmphy
Subtitle
AuthorsTakashi YAMAGISHI*, Takami SASADA**, Junya MAEDA**, Takato KOHNO**, Kensei YOSHINAGA**, Hiroshi OGAWA*, Yasuo MATSUDA*, Masaharu OZAKI*, Reizo KUSUKAWA*
Authors(kana)
Organization*Ymaguchi University Hospital, **Tokuyama Central Hospital
JournalThe Japanese Journal of nuclear medicine
Volume26
Number2
Page155-164
Year/Month1989/2
ArticleOriginal article
PublisherTHE JAPANESE SOCIETY OF NUCLEAR MEDICINE
Abstract[Summary] Accuracy of the measurements of LV volumes and ejection fraction determined from multigated blood pool tomography (MGBPT) was tested in 23 patients with various heart diseases who underwent cineventriculography (CV). Preliminary phantom studies showed that a 42% threshold value was found to provide the best relationship between measured and actual volumes (r=0.99, standard error of the estimate (SEE)=4.7 ml). The patients studies were performed at 16 frames/cardiac cycle at 18 angles over a 180° rotation for one minute per angle. Long-axis horizontal views were reconstructed. The numbers of LV voxel with counts above the threshold value were summed and multiplied by the known volume of a voxel. Measurements of LV volume (r=0.82, SEE=29ml), end-systolic LV volume (r=0.83, SEE=25ml), end-diastolic LV volume (r=0.68, SEE=33ml), and ejection fraction (r=0.73, SEE=10%) determined from MGBPT correlated well with those determined by CV. However, the ratios (Y) of the difference of the MGBPT-volume from the CV-volume to the CV-volume were decreased progressively and negatively as the CV-volumes (X) were smaller (Y=38-3,996/X). Thus, we conclude that the determinations of volume by MGBPT would lead to more errors with the smaller volumes.
PracticeClinical medicine
KeywordsMultigated blood pool tomography, Volume measurements

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