Objective:To diseuss the feasibility of the scan-delay-time in cerebral and cervix with Volune CT Digitial Subtraction Angiography(VCTDSA) deducing by Ihe time-to-peak(TP) in dynamic scan with CT perfusion imaging. Method: Analysis was performed in 149 patients who had examined the cerebral and cervical vessel with VCTDSA

while 108 cases examining Cerebral Vessels

the other 41 examining Cephalic and Cervical Vessel. They were all measured with TP and enhancement value of CT in the M1 segment of left middle cerebral artery(LMCA)、superior sagittal sinus(SSS)、left common carotid artery(LCCA) adjacent to the fourth cervical vertebrae(C4) and internal jugular vein(IJV). Results:The discrepancy of TP between CCA and MCA was 0.22 second

without statistically different

P>0.05. While between IJV and SSS it was 1.31 second

between MCA and SSS 6.06 second

between CCA and IJV 7.59 second. At the same time of TP

the left common carolid artery adjacent to the fourth cervical verlebrae and IJV enhanced significantly more than the M1 segment of lett middle cerebral artery and SSS. Conclusion:The TP in Cerebral Vessels and Cephalic and Cervical Vessel was not obviously difference testing by contrast agenl mass injection method. So we can deduce lhe scan-delay-time in cerebral and cervix with VCTDSA by the TP with CT perfusion dynamic scan.