First heating measurements of endovascular stents in magnetic particle imaging.

First heating measurements of endovascular stents in magnetic particle imaging. Phys Med Biol. 2018 Jan 15;: Authors: Wegner F, Friedrich T, Panagiotopoulos N, Vaalma S, Goltz JP, Vogt FM, Koch MA, Buzug TM, Barkhausen J, Haegele J Abstract Magnetic Particle Imaging (MPI) is a three-dimensional imaging method which visualizes the spatial distribution of Superparamagnetic Iron Oxide Nanoparticles (SPIOs) with oscillating and static magnetic fields. It is a quantitative method as the intensity of its signal is proportional to the concentration of the SPIOs. Due to its quantitativeness, high temporal resolution and kidney-safe tracers it is proposed to be a very promising noninvasive method for cardiovascular imaging. In this regard MPI in the presence of endovascular stents and assessment of stent patency with MPI has to be evaluated. The purpose of this study was to evaluate the heating of endovascular stents due to the alternating magnetic fields as a safety aspect of MPI. Twenty one commercially available endovascular stents of different sizes (diameter: 3, 3.5, 4, 5, 6, 7, 8, 10 mm, length: 11 - 99 mm) and materials (stainless steel, nitinol, platinum-chromium, cobalt-chromium) were evaluated. They were implanted in silicone tubes matching the stent diameter and placed at the center of the bore of a preclinical MPI scanner (Bruker-Biospin, Ettlingen, Germany). The temperature was measured with fiber optic thermometers over a scan d...
Source: Physics in Medicine and Biology - Category: Physics Authors: Tags: Phys Med Biol Source Type: research