磁共振成像诱导的起搏器导线发热：温度探头位置及起搏器放置对导线尖端发热和局部比吸收率的影响

MRI induced heating of pacemaker leads: effect of temperature probe positioning and pacemaker placement on lead tip heating and local SAR.

作者信息

Mattei E, Calcagnini G, Triventi M, Censi F, Bartolini P, Kainz W, Bassen H

机构信息

Dept. of Technol. & Health, Italian Nat. Inst. of Health, Roma, Italy.

出版信息

Conf Proc IEEE Eng Med Biol Soc. 2006;2006:1889-92. doi: 10.1109/IEMBS.2006.260068.

DOI:10.1109/IEMBS.2006.260068

PMID:17946486

Abstract

The radio frequency field used in magnetic resonance imaging (MRI) procedures leads to temperature and local absorption rate (SAR) increase for patients with implanted pacemakers (PM). In this work a methodological approach for temperature and SAR measurements using fluoroptic probes is presented. Experimental measures show how the position of temperature probes affects the temperature and SAR value measured at the lead tip. The transversal contact between the active portion of the probe and the lead tip is the configuration associated with the highest values for temperature and SAR, whereas other configurations may lead to an underestimation close to 11% and 70% for temperature and SAR, respectively. In addition measurements were performed on a human-shaped phantom inside a real MRI system, in order to investigate the effect of the PM placement and of the lead geometry on heating and local SAR.

摘要

磁共振成像（MRI）程序中使用的射频场会导致植入起搏器（PM）的患者体温升高和局部吸收率（SAR）增加。在这项工作中，提出了一种使用荧光探针进行温度和SAR测量的方法。实验测量表明，温度探头的位置如何影响在导线尖端测量的温度和SAR值。探头的有源部分与导线尖端之间的横向接触是与最高温度和SAR值相关的配置，而其他配置可能分别导致温度和SAR低估近11%和70%。此外，还在真实MRI系统内的人体模型上进行了测量，以研究PM放置和导线几何形状对加热和局部SAR的影响。