Development of an automatic ROI setting program for input function determination in 99mTc-ECD non-invasive cerebral blood flow quantification

The coincidence ratio between the ROI automatic method and the manual setting method was 98%. The mean difference in the ROI location was ±6.4 mm in the X direction and ±8.6 mm in the Y direction. Individual rCBF values obtained using these independent techniques were also reasonably well correlated (r = 0.95). The total time for the IBUR analysis using the automatic method is 2-3 min as compared to 20-30 min for the current analysis method. This technique improves the throughput of nuclear medical examinations.