A preliminary study of the gated myocardial SPECT imaging using 99mTc-CPI

In this paper the results of the gated SPECT on the myocardium using 99mTc-CPI for 23 cases are presented. The myocardial fringe, thickness and radioactive distribution were shown clearly. The results showed that the diagnostic ability of gated SPECT in regional myocardial ischemia was superior to that of the SPECT (the positive rate enhanced up to 17.7%). The values of the diagnostic sensitivity for >45% stenosis of LAD, LCX, RCA and the total were 100%, 40%, 100% and 85.7% respectively by the gated SPECT and were 90%, 0, 83.3% and 66.7% respectively by the SPECT. The authors could obtain the left ventricle systolic fraction (LVSF) through the data of the gated SPECT by computer. The LVSF had a close correlation with the LVEF (left ventricle ejection fraction) obtained by the multi-gated blood pool imaging (r 0.7045, P<0.01) and the ECG (r = 0.6812, P<0.05). The average myocardial diastolic volume was 275.3 +- 63.4 ml in 6 normals and 264.5 +- 49.1 ml in 16 CADs