Table 5:

Illustrative ICU patient CT/CTA and cerebral angiography exposures^{^a}

	Patient 1	Patient 2	Patient 3	Patient 4
No. of CTA	12	8	8	8
PSD (mGy)	1187	791	791	791
No. of head CT	2	7	4	18
PSD (mGy)	78	274	157	706
No. of cerebral angiograms	11	9	2	14
Cumulative skin dose (mGy)^{^b}	2667	1574	908	3261
Total skin dose, all exams (mGy)	3932	2639	1856	4758
Time interval for all exams (days)	30	18	16	31

↵a All patient CT exams performed on scanner 1.
↵b Cumulative skin dose for cerebral angiography predicted from phantom measurements.