In vivo hemodynamic analysis of intracranial aneurysms obtained by magnetic resonance fluid dynamics (MRFD) based on time-resolved three-dimensional phase-contrast MRI

• Published in: Neuroradiology 2010-10, Vol.52 (10), p.921-928
• Main Authors: Isoda, Haruo, Ohkura, Yasuhide, Kosugi, Takashi, Hirano, Masaya, Takeda, Hiroyasu, Hiramatsu, Hisaya, Yamashita, Shuhei, Takehara, Yasuo, Alley, Marcus T., Bammer, Roland, Pelc, Norbert J., Namba, Hiroki, Sakahara, Harumi
• Format: Article
• Language: English
• Subjects: Aged; Aneurysms; Biological and medical sciences; Blood Flow Velocity; Cerebrovascular Circulation; Computer Simulation; Female; Humans; Image Interpretation, Computer-Assisted - methods; Imaging; Imaging, Three-Dimensional - methods; Interventional Neuroradiology; Intracranial Aneurysm - diagnosis; Intracranial Aneurysm - physiopathology; Investigative techniques, diagnostic techniques (general aspects); Magnetic Resonance Angiography - methods; Magnetic Resonance Imaging, Cine - methods; Male; Medical sciences; Medicine; Medicine & Public Health; Middle Aged; Models, Cardiovascular; Nervous system; Nervous system involvement in other diseases. Miscellaneous; Neurology; Neuroradiology; Neurosciences; Neurosurgery; NMR; Nuclear magnetic resonance; Radiodiagnosis. Nmr imagery. Nmr spectrometry; Radiology; Reproducibility of Results; Sensitivity and Specificity
• ISSN: 0028-3940; 1432-1920
• DOI: 10.1007/s00234-009-0635-3

Introduction Hemodynamics is thought to play a very important role in the initiation, growth, and rupture of intracranial aneurysms. The purpose of our study was to perform in vivo hemodynamic analysis of unruptured intracranial aneurysms of magnetic resonance fluid dynamics using time-resolved three-dimensional phase-contrast MRI (4D-Flow) at 1.5 T and to analyze relationships between hemodynamics and wall shear stress (WSS) and oscillatory shear index (OSI). Methods This study included nine subjects with 14 unruptured aneurysms. 4D-Flow was performed by a 1.5-T magnetic resonance scanner with a head coil. We calculated in vivo streamlines, WSS, and OSI of intracranial aneurysms based on 4D-Flow with our software. We evaluated the number of spiral flows in the aneurysms and compared the differences in WSS or OSI between the vessel and aneurysm and between whole aneurysm and the apex of the spiral flow. Results 3D streamlines, WSS, and OSI distribution maps in arbitrary direction during the cardiac phase were obtained for all intracranial aneurysms. Twelve aneurysms had one spiral flow each, and two aneurysms had two spiral flows each. The WSS was lower and the OSI was higher in the aneurysm compared to the vessel. The apex of the spiral flow had a lower WSS and higher OSI relative to the whole aneurysm. Conclusion Each intracranial aneurysm in this study had at least one spiral flow. The WSS was lower and OSI was higher at the apex of the spiral flow than the whole aneurysmal wall.