Perlo Josefina, Silletta Emilia V, Danieli Ernesto, Cattaneo Giorgio, Acosta Rodolfo H, Blümich Bernhard, Casanova Federico
Institut für Technische und Makromolekulare Chemie, RWTH Aachen University, Worringerweg 1, 52062 Aachen, Germany.
FaMAF-Universidad Nacional de Córdoba & IFEG-CONICET, Córdoba, Argentina.
Magn Reson Imaging. 2015 Apr;33(3):328-35. doi: 10.1016/j.mri.2014.12.005. Epub 2014 Dec 17.
In this work we evaluate the performance of a 40-mm diameter bore 0.2T desktop Halbach tomograph to obtain 2D and 3D velocity maps for studying intra-aneurismal flow in the presence or absence of nitinol meshed implants with the aim of optimizing the flow diverter efficacy. Phantoms with known spatial velocity distribution were used to determine the performance of the MRI system. Maximum velocities of about 200mm/s could be measured with a precision of 1% at a spatial resolution of 0.5×0.5×1mm(3). This accuracy is suitable to evaluate in vitro intra-aneurismal flow under different conditions such as variable flow rates, different vessel-aneurysm geometry, as well as the influence of metallic flow diverters on the intra-aneurismal flow distribution. The information obtained non-invasively with desktop tomographs can be used to complement in vivo studies in order to decide the optimum flow diverter.
在这项工作中，我们评估了一台直径40毫米、0.2特斯拉的台式哈尔巴赫断层扫描仪的性能，以获取二维和三维速度图，用于研究有无镍钛诺网状植入物时的动脉瘤内血流情况，目的是优化分流器的疗效。使用具有已知空间速度分布的体模来确定MRI系统的性能。在空间分辨率为0.5×0.5×1毫米³的情况下，能够测量出约200毫米/秒的最大速度，精度为1%。这种精度适用于评估不同条件下的体外动脉瘤内血流，如不同的流速、不同的血管-动脉瘤几何形状，以及金属分流器对动脉瘤内血流分布的影响。通过台式断层扫描仪非侵入性获得的信息可用于补充体内研究，以确定最佳分流器。
