Temperature and SAR measurement errors in the evaluation of metallic linear structures heating during MRI using fluoroptic® probes
Temperature and SAR measurement errors in the evaluation of metallic linear structures heating during MRI using fluoroptic® probes
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DOI：
10.1088/0031-9155/52/6/006
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发表时间：
2007-03-21
影响因子：
3.5
通讯作者：
Bartolini, P.
中科院分区：
文献类型：
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作者：
Mattei, E.;Triventi, M.;Bartolini, P.
本工作旨在评价磁共振成像（MRI）期间使用起搏器（PM）电极导线上的荧光（R）温度探头进行温度和SAR测量的相关误差。我们对起搏器电极导线进行了温度测量，用25、64和128 MHz电流激发。使用荧光（R）温度计（Luxtron，型号3100，USA）测量PM电极导线头端发热。研究了温度探头的着色部分与PM电极导线头端之间的不同接触配置，以找到最大限度地降低温度和SAR低估的接触位置。使用计算机模型来估计荧光（R）探头在温度和SAR测量中的误差。温度探头的着色部分与PM电极导线头端的横向接触可最大限度地降低对温度和SAR的低估。该接触位置也具有最低的温度和SAR误差。对于其他接触位置，最大温度误差可高达-45%，而最大SAR误差可高达-54%。使用温度探头进行MRI产热评价时，应使用最大误差最小化的接触位置，需要提供全面的不确定度预算，并应规定温度和SAR误差。
The purpose of this work is to evaluate the error associated with temperature and SAR measurements using fluoroptic (R) temperature probes on pacemaker ( PM) leads during magnetic resonance imaging (MRI). We performed temperature measurements on pacemaker leads, excited with a 25, 64, and 128 MHz current. The PM lead tip heating was measured with a fluoroptic (R) thermometer (Luxtron, Model 3100, USA). Different contact configurations between the pigmented portion of the temperature probe and the PM lead tip were investigated to find the contact position minimizing the temperature and SAR underestimation. A computer model was used to estimate the error made by fluoroptic (R) probes in temperature and SAR measurement. The transversal contact of the pigmented portion of the temperature probe and the PM lead tip minimizes the underestimation for temperature and SAR. This contact position also has the lowest temperature and SAR error. For other contact positions, the maximum temperature error can be as high as -45%, whereas the maximum SAR error can be as high as -54%. MRI heating evaluations with temperature probes should use a contact positionminimizing the maximum error, need to be accompanied by a thorough uncertainty budget and the temperature and SAR errors should be specified.