PT  - JOURNAL ARTICLE
AU  - L.-D. Jou
AU  - M.E. Mawad
TI  - Analysis of Intra-Aneurysmal Flow for Cerebral Aneurysms with Cerebral Angiography
AID  - 10.3174/ajnr.A3057
DP  - 2012 Oct 01
TA  - American Journal of Neuroradiology
PG  - 1679--1684
VI  - 33
IP  - 9
4099  - http://www.ajnr.org/content/33/9/1679.short
4100  - http://www.ajnr.org/content/33/9/1679.full
SO  - Am. J. Neuroradiol.2012 Oct 01; 33
AB  - BACKGROUND AND PURPOSE: Hemodynamics is an important factor in the development and rupture of cerebral aneurysms. Current techniques for measuring blood flow in cerebral aneurysms suffer from various limitations and have not been able to address our clinical needs. A new technique has been developed for effective evaluation of intra-aneurysmal flow based on high-frame-rate cerebral angiography, especially for flow-diverters. MATERIALS AND METHODS: Six patients with 7 unruptured ICA aneurysms were imaged with a specially designed DSA protocol (a 3D DSA and a 2D DSA acquired at 30 frames/s, with a 2-mL/s contrast injection rate). Images of these cases were analyzed to determine the intra-aneurysmal flow based on the newly developed technique. Patient-specific aneurysm models were used for CFD calculation, and intra-aneurysmal flow rates were computed numerically. The intra-aneurysmal flow rates from the 2 methods were then compared. RESULTS: There is a linear relationship between intra-aneurysmal flow ratios obtained from high-frame-rate cerebral angiography and CFD calculation (R = 0.99). A high frame rate (30 frames/s) provides a better estimate of intra-aneurysmal flow than low frame rates (7.5 frames/s and 15 frames/s). CONCLUSIONS: The CFD calculation validates the estimate of intra-aneurysmal hemodynamics from cerebral angiography. The linear relationship obtained by using these 2 techniques can be used for real-time assessment of intra-aneurysmal hemodynamics for cerebral aneurysms. CAcerebral angiographyCFDcomputational fluid dynamicsPC-MRAphase-contrast MR angiography