Background: The demand for refinement in noninvasive and quantitative assessment of left ventricular (LU) function is increasing. Purpose : To assess normal values of left ventricular functional parameters during both systole and diastole hy scintigraphic method using computerized triple-head gamma camera and to evaluate correlations between these parameters. Methods .' ECG gated blood pool scan with " Tc#-Hurnan serum albumin was performed in 94 normal Korean;ubjects. Ejection fraction (EF), systolic parameters [peak emptying rate (PER), average emptying rate (AER), tirne to peak emptying rate (TPER)], and diastolic parameters [peak filling rate (PFR), average filling rate (AFR), time to peak filling rate (TPFR)] were obtained by analysis of LV time-activity curve, the correlation of these parameters to the age and sex, and the correlation between these parameters were evaluated. Results : 1) Mean value of ejection fraction in study subjects was 59.6 +- 5.25% and showed no significant correlation to age (r=0.08) and sex but showed most pronounced correlation to PFR (r=0.46, p<0.001), PER (r=0.41, p<0.001), AFR (r=0.34, p<0.001) and AER (r=0.28, p<0.01). 2) Mean values of systolic parameters were as follows: PER=3.22+ 0.50 end-cliastolic volume/sec, AER =2.22+0.45 end-diastolic volume/sec, TPER=103.5+29.30 msec. They showed no significant correlation to age and sex. 3) Mean values of diastolic parameters were as follows: PFR=2.71+0.51 end-diastolic volume/sec, AFR=1.830.44 end-diastolic volume/sec, TPFR=132.1+33.45 msec. They showed strong correlation to age