PMID: 18719309Aug 23, 2008Paper

Investigation of the local heating caused by a closed conducting loop at clinical MR imaging: Phantom study

Nihon Hoshasen Gijutsu Gakkai zasshi
Masaru YamazakiM Motozuka

Abstract

Several reports have suggested that unusual thermal injuries in magnetic resonance (MR) imaging have occurred due to a closed conducting loop formed accidentally in a part of the patient's body. In this study, we investigated the relationship between the increases in temperature and several parameter settings for MR imaging by use of a human body-equivalent phantom. A standard clinical 1.5T MR system (SIGNA HORIZON; GE) and a pelvic phased-array coil were used. The human body-equivalent phantom (agar, 0.9% saline, antiseptic) simulated a part of the pelvis and both femurs in a patient. A closed conducting loop could be reproduced when two ends of femurs contacted each other at a point, so that we could measure the temperature changes without and with a closed conducting loop. The temperature of the phantom was measured at the contact point of a closed conducting loop and the center of phantom by use of an optical fiber thermometer which was immune to the influences of radiofrequency (RF) and magnetic and electronic fields. We tested two imaging sequences of spin echo (SE) and fast spin echo (FSE) with 60 minutes of scanning time. In addition to the standard imaging sequences we measured temperature changes without the RF irradi...Continue Reading

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