Japanese
Titleファーストパス半幾何学的カウント法による左室容積の計測
Subtitle研究速報
Authors木下信一郎*, 鈴木哲男*, 山下三朗*, 井出雅生*, 村松俊裕*, 土肥豊*, 西村克之**, 宮前達也**, 山本功***
Authors(kana)
Organization*埼玉医科大学第二内科, **埼玉医科大学放射線科, ***大宮赤十字病院放射線科
Journal核医学
Volume29
Number1
Page117-121
Year/Month1992/1
Article報告
Publisher日本核医学会
Abstract「要旨」RI心アンギオグラフィのファーストパス(FP)法データのみを用い, 左室容積を算出する方法を新たに開発した. 半幾何学的カウント法(SGM)によれば, voxel当たりのカウントをCv, 左室最大カウントをCM, 直角方向からみた左室最大長をL, pixel sizeをd, 左室総カウントをCT, 左室容積をVとすると, V=(CT/Cv)×d3=(CT/CM)×L×d2となる. これを右前斜位30度から撮像したFP法に適用した. 直角方向からみた最大長は, 左室短軸断面を円と仮定し, FP像の左室最大幅とした. また, 左前斜位から撮像した通常の平衡時法データと, 上記FP拡張終期像における左室最大長から, 当施設ルーチン検査としてのSGM左室容積を得た. 両法による左室拡張終期容積はr=0.96(P<0.001)でよく相関した. 99mTc標識血流用剤が広く臨床応用されようとするとき, 本法の臨床的意義は大きいと考えられた.
Practice臨床医学：一般
KeywordsRadionuclide angiocardiography, First pass method, Left ventricular volume, Volumetry, Cardiac function.
English
TitleLeft Ventricular Volume Determination by First-Pass Radionuclide Angiocardiography Using a Semi-Geometric Count-Based Method
SubtitleRapid　Communication
AuthorsShinichiro KINOSHITA*, Tetsuo SUZUKI*, Saburo YAMASHITA*, Toshihiro MURAMATSU*, Masao IDE*, Yutaka DOHI*, Katsuyuki NISHIMURA**, Tatsuya MIYAMAE**, Isao YAMAMOTO***
Authors(kana)
Organization*Second Department of Internal Medicine, Saitama Medical School, **Department of Radiology, Saitama Medical School, ***Department of Radiology, Oomiya Red-Cross Hospital
JournalThe Japanese Journal of nuclear medicine
Volume29
Number1
Page117-121
Year/Month1992/1
ArticleReport
PublisherTHE JAPANESE SOCIETY OF NUCLEAR MEDICINE
Abstract[Summary]A new radionuclide technique for the calculation of left ventricular (LV) volume by the first-pass (FP) method was developed and examined. Using a semi-geometric count-based method, the LV volume can be measured by the following equation: Cv=CM/(L/d). V=(CT/Cv)×d3=(CT/CM)×L×d2. (V=LV volume, Cv=voxel count, CM=the maximum LV count, CT=the total LV count, L=LV depth where the maximum count was obtained, and d=pixel size. ) This theorem was applied to FP LV images obtained in the 30-degree right anterior oblique position. Frame-mode aquisition was performed and the LV end-diastolic maximum count and total count were obtained. The maximum LV depth was obtained as the maximum width of the LV on the FP end-diastolic image, using the assumption that the LV cross-section is circular. These values were substituted in the above equation and the LV end-diastolic volume (FP-EDV) was calculated. A routine equilibrium (EQ) study was done, and the end-diastolic maximum count and total count were obtained. The LV maximum depth was measured on the FP end-diastolic frame, as the maximum length of the LV image. Using these values, the EQ-EDV was calculated and the FP-EDV was compared to the EQ-EDV. The correlation coefficient for these two values was r=0.96 (n=23, p<0.001), and the standard error of the estimated volume was 10ml. In conclusion, this new method for calculation of the LV volume was considered to be useful, especially for the evaluation of cardiac function by 99mTc-labeled cardiac blood flow imaging agents.
PracticeClinical medicine
KeywordsRadionuclide angiocardiography, First pass method, Left ventricular volume, Volumetry, Cardiac function.

【全文PDF】