. Author manuscript; available in PMC: 2021 Jul 21.

Published in final edited form as: J Neurosurg. 2020 Feb 7;134(3):862–869. doi: 10.3171/2019.12.JNS192746

Table 3.

SI measurements on pre- and post-contrast T1-weighted images in nine UIAs using different MRI manufacturers. CR_stalk also included for comparison.

MRI Scanner	Mean SI_pre	Max SI_pre	Mean SI_post	Max SI_post	CR_stalk^*
3T Siemens	155.9	287.7	247.9	437.8	0.71/0.42
3T GE	121.3	194.9	183.9	288.3	0.68/0.41
7T GE^†	232.2	402.3	378.8	671.0	0.79/0.45

CR_stalk: aneurysm-to-piutitary stalk ratio; MRI: magnetic resonance imaging; SI: signal intensity; UIAs: unruptured intracranial aneurysms.

Maximal CR_stalk / Mean CR_stalk.

^†

Only 3 UIAs underwent a 7T GE MRI.