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Estimated dose for patients without intervention
Modality Mean No. of Procedures/Case mGy/Case Total Dose
Angiography 1.2 310 372.0
Head CT 2.9 46.4 134.6
Portable CT 4.0 120 480.0
CTA 1.5 46.4 69.6
CT perfusion 0.6 288.7 173.2
Chest x-ray 12.0 Negligible Negligible
Cumulative dose (mGy) 1229.4
Cumulative dose (Gy) 1.2

Modality	Mean No. of Procedures/Case	mGy/Case	Total Dose
Angiography	1.2	310	372.0
Head CT	2.9	46.4	134.6
Portable CT	4.0	120	480.0
CTA	1.5	46.4	69.6
CT perfusion	0.6	288.7	173.2
Chest x-ray	12.0	Negligible	Negligible
		Cumulative dose (mGy)	1229.4
		Cumulative dose (Gy)	1.2