The aim of the ViavBrain project is to provide a validation loop from MRA (magnetic resonance angiography) acquisitions to MRA simulations, see Figure 1. It is composed of MR images filtering and/or segmentation, blood flow simulation and MRA simuation.
In order to validate all points of the VivaBrain loop, we firstly use an MRI phantom, Figure 2
An MRI phantom is an MRI compatible object (no metal!) that can be placed in the magnetic field of the MRI machine. Typically, a benchmark such as Figure 3 is realized.
The FreeFem++ algorithm used in this siumation is the unsteady Navier-Stokes Uzawa algorithm with the phantom mesh.
A constant flow is imposed at the inlet of the phantom, a null velocity on the wall and the outlet is free.
Result is shows Figure 4 where pressure field is displayed on the wall and velocity is displayed using stream lines.
|A complete study about this MRI phantom will be available soon in the ESAIM Proceedings and Surveys as a CEMRACS proceedings. A first presentation of this project is available on Hal|