Magnetic resonance fluid dynamics for intracranial aneurysms--comparison with computed fluid dynamics
Takehiro Naito1, Shigeru Miyachi, Noriaki Matsubara
1Department of Neurosurgery, Nagoya University Graduate School of Medicine, Showa-ku, Aichi, Japan.
Acta Neurochirurgica
|March 7, 2012
Summary
Magnetic resonance fluid dynamics (MRFD) offers a less invasive way to assess intracranial aneurysm hemodynamics compared to computed fluid dynamics (CFD). While WSS values differ, MRFD shows promise for predicting rupture risk by analyzing flow patterns.
Area of Science:
- Medical Imaging
- Biomedical Engineering
- Fluid Dynamics
Background:
- Intracranial aneurysm growth and rupture are linked to hemodynamics.
- Conventional computed fluid dynamics (CFD) analysis using 3D CT angiography is time-consuming.
- Magnetic resonance fluid dynamics (MRFD) offers a potentially faster, less invasive method using MR imaging.
Purpose of the Study:
- To compare MRFD and CFD in analyzing intracranial aneurysm hemodynamics.
- To evaluate the clinical feasibility of MRFD.
Main Methods:
- 15 aneurysms (2 ruptured) studied using MR imaging and 3D CT angiography.
- MRFD and CFD data extracted for 3D streamlines, velocity profiles, and wall shear stress (WSS).
- Comparison of flow patterns and WSS between MRFD and CFD.
Main Results:
- MRFD and CFD showed similar 3D flow patterns and WSS distribution.
- Significant differences and no correlation found in maximum WSS values.
- CFD had limited visualization in one ruptured case; MRFD identified abnormal flow patterns preceding rupture.
Conclusions:
- MRFD is a valuable, less invasive tool for evaluating aneurysmal hemodynamics without contrast or radiation.
- Despite WSS value discrepancies, MRFD's flow pattern analysis can aid in predicting aneurysm enlargement or rupture risk.
- Further research needed for quantifiable analysis and high-risk threshold establishment.
