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Clinical Research
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Magnetic resonance imaging safety and compatibility for three silver-containing wound dressings Hanson LG, Soegaard LV, Sidaros K, Danish Research Centre for Magnetic Resonance, Copenhagen University Hospital Hvidovre; Dolmer M, Coloplast A/S, Wound Care SBU, Humlebaek, Denmark. Introduction: Use of silver-containing wound dressings is increasing dramatically, increasing focus on whether silver dressings are safe and compatible with different diagnostics tools. Use of Magnetic Resonance Imaging (MRI) is also a growing field as MRI scanners are becoming increasingly widespread. Here we present results regarding the MR safety and compatibility of three silver-containing wound dressings (foam (A), hydrocolloid (B) and contact layer (C)) Methods: MR safety and compatibility tests of the dressings were conducted under realistic worst-case conditions at a 3T scanner. Internal temperatures of the dressings were measured before and after two hours of high Specific Absorption Rate (SAR) imaging. Realistic levels of power for a clinical setting were thus exceeded. To test MR-compatibility issues, a phantom was used to evaluate induced radio frequency (RF) and magnetic field inhomogeneity and to evaluate effects of induced eddy currents. Results: After two hours of SAR intensive turbo spin-echo imaging, the temperature increased from 23.4°C to 24.7°C for the three dressings, which are well below the level of significance. High-quality images with no signs of inhomogeneity or distortion induced by the dressings were obtained. Considerable in-plane geometric distortions were found for echo-planar imaging measurements. However, the severity of inhomogeneity problems was similar at phantom corners with dressings and the corner without dressing. Conclusions: Heating gave no indication of safety problems under realistic worst-case conditions. Consequently, the dressings are MR-safe under the considered conditions. There was no indication of MR image deterioration for conventional gradient-echo or multi spin-echo sequences. We conclude that (a-b-c) are MR compatible for gradient-echo and spin-echo measurements under the considered conditions and therefore possible to leave the dressings in place while performing MRI scanning. Some manufacturers state that their silver dressings are MRI incompatible. Therefore, the conclusions from the present study cannot be extended to other silver dressings A) Contreet Foam.B) Contreet Hydrocolloid.C) Physiotulle Ag |
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