IFEG   20353
INSTITUTO DE FISICA ENRIQUE GAVIOLA
Unidad Ejecutora - UE
congresos y reuniones científicas
Título:
Intra-aneurysmal flow determination by 3D velocity maps using low field NMR tomography
Autor/es:
J. PERLO; E.V. SILLETTA; E. DANIELI; B. BLÜMICH; R.H. ACOSTA; F. CASANOVA
Lugar:
Rosario
Reunión:
Taller; Taller Frontera de Resonancia Magnetica; 2013
Institución organizadora:
Fundacion IBR
Resumen:
Dynamic NMR imaging is the only method capable of measuring velocity patterns within flowing systems in a complete non-invasive way. This makes MRI velocimetry an attractive technique to study flow phenomena in many areas of research, in particular medical technology, where stents are use to treat aneurysms. An aneurysms is caused by a local weakness of a vessel wall, which enlarges the size of an artery or vein. The two events that dominate the evolution of an intracranial aneurysm are growth and rupture, being both dependent on intra-aneurysmal flow. Decreasing the intra-aneurysmal flow is one way of treating intracranial aneurysms. This can be achieved by inserting a stent. Knowledge of the velocity patterns in aneurysms is essential to understanding and treating the disease.  In this work we present low-field NMR imaging to study intra-aneurysmal velocity patterns under steady flow conditions before and after insertion of a stent. 3D velocity maps of fluids with rheological properties similar to those of blood were measured with spin-echo imaging using a portable low-field tomograph (0.22T) to study the flow behavior in a phantom of an aneurysm. It was possible to determine the influence of curvature of the artery on the flow pattern in the aneurysm. In absence of a stent, a rotational vortex is observed when the artery is curved. In the presence of a stent the flow in the aneurysm is greatly attenuated.