Cumulative Radiation Dose during Hospitalization for Aneurysmal Subarachnoid Hemorrhage

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Fig 1.
Histogram graphing the distribution of patients by cumulative radiation dose (in grays).
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Fig 2.
Contribution of various modes of imaging to the cumulative radiation doses. Interventional and diagnostic procedures are divided by angiographic runs and fluoroscopy.
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Fig 3.
Comparison of the cumulative radiation doses between patients treated with either surgical clipping or coil embolization of the index aneurysm.
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Fig 4.
Comparison of the cumulative radiation as divided by Hunt and Hess grades, Fisher scores, number of cerebral aneurysms identified, or aneurysm size. Aneurysms with the largest diameter measuring >10 mm are considered large.
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Fig 5.
Scatterplot of cumulative radiation dose by length of hospitalization. A linear regression curve is best fit to the data (R = 0.45, P = NS).

Radiation-reduction techniques (in grays)^a

	Mean	% Reduction	Minimum	Maximum
Unmodified	12.8 ± 7.7		2.4	36.1
Fixed replacing portable CT	12.5 ± 7.5	2.3	2.2	35.3
Low-dose portable CT	12.6 ± 7.5	1.9	2.2	35.5
CTA replacing DSA	12.2 ± 7.6	4.9	0.3	35.5
MRI replacing CT	12.0 ± 7.3	6.6	0.3	34.2
Lower fluoroscopy rate	11.3 ± 6.8	11.6	2.4	32.7
3.6–2.7 μGy per frame	11.0 ± 6.5	13.8	2.4	31.1
3.6–1.8 μGy per frame	9.1 ± 5.3	29.1	2.3	26.7
All above	6.4 ± 4.0	56.6	0.0	18.7

a Calculated dose based on individual specific modifications of imaging techniques as described in the text. Dose was calculated for each patient and individual study and reported for the collective group.