Université de Lyon, CREATIS, UMR CNRS 5220, Inserm U 1044, Insa-Lyon, Villeurbanne, France.
Magn Reson Med. 2011 Aug;66(2):448-55. doi: 10.1002/mrm.22834. Epub 2011 Feb 28.
Heat produced by a magnetic resonance (MR) imaging sequence in the vicinity of a conductive wire (pacemaker, electrodes, or catheter), is a subject of interest for the assessment of patient safety during imaging. For this purpose, the measurement of temperature rises during an MR imaging sequence using MR T1-based thermometry provides several advantages, mainly in its ability to retrieve in situ real-time thermal maps. Recent studies investigated the heat produced by an independent radiofrequency pulse, assessing MR imaging sequence heating using a specific MR thermometry sequence. This study focuses on self-heating for which the radiofrequency pulses used for measuring temperature create the heat. An experimental design was set up to evaluate T1-based thermometry self-heating using a coupled/decoupled wire and to compare it with a reference temperature gathered by an optical fiber device. For the tested experimental set up, T1-based thermometry is in fairly good agreement with optical fiber reference temperature.
磁共振（MR）成像序列在附近的导电线（起搏器、电极或导管）附近产生的热量，是评估成像期间患者安全性的关注问题。为此，使用基于 MR T1 的测温法测量 MR 成像序列期间的温升，提供了几个优点，主要在于其能够实时获取原位热图的能力。最近的研究调查了独立射频脉冲产生的热量，使用特定的 MR 测温序列评估 MR 成像序列加热。本研究关注的是自热，用于测量温度的射频脉冲会产生热量。设计了一个实验方案，使用耦合/去耦线评估基于 T1 的测温自热，并将其与光纤设备采集的参考温度进行比较。对于测试的实验设置，基于 T1 的测温与光纤参考温度相当吻合。
