[Left ventricular volume determination by first-pass radionuclide angiocardiography using a semi-geometric count-based method].
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) x d3 = (CT/CM) x L x 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 acquisition 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 less than 0.001), and the standard error of the estimated volume was 10 ml.(ABSTRACT TRUNCATED AT 250 WORDS)
Kinoshita
S
S
Second Department of Internal Medicine, Saitama Medical School.
Suzuki
T
T
Yamashita
S
S
Muramatsu
T
T
Ide
M
M
Dohi
Y
Y
Nishimura
K
K
Miyamae
T
T
Yamamoto
I
I
D002306:Cardiac Volume; D003327:Coronary Disease / Q000000981:diagnostic imaging / Q000503:physiopathology; D006349:Heart Valve Diseases / Q000000981:diagnostic imaging / Q000503:physiopathology; D006801:Humans; D012588:Scintillation Counting / Q000379:methods*; D013667:Technetium; D016277:Ventricular Function, Left; D015646:Ventriculography, First-Pass / Q000379:methods*
D013667:Technetium