Changes in the specific absorption rate (SAR) of radiofrequency energy in patients with retained cardiac leads during MRI at 1.5T and 3T.
Changes in the specific absorption rate (SAR) of radiofrequency energy in patients with retained cardiac leads during MRI at 1.5T and 3T.
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DOI：
10.1002/mrm.27350
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发表时间：
2019-01
影响因子：
3.3
通讯作者：
Wald LL
中科院分区：
文献类型：
--
作者：
Golestanirad L;Rahsepar AA;Kirsch JE;Suwa K;Collins JC;Angelone LM;Keil B;Passman RS;Bonmassar G;Serano P;Krenz P;DeLap J;Carr JC;Wald LL
旨在评价在64 MHz（1.5 T）和127 MHz（3 T）下进行MRI期间，作为RF线圈类型和成像标志的函数的保留心脏电极导线周围的局部SAR和发热。保留的心脏电极导线的数值模型，建立从CT和X射线图像的6例患者保留的心脏电极导线。电磁模拟和生物热建模使用MRI RF身体和头部线圈进行，线圈调谐到64 MHz和127 MHz，并定位在覆盖从头部到下肢区域的9个不同成像标志处。对于所有患者，在1.5 T和3 T下，局部发射头部线圈产生的温升可忽略不计（ΔT < 0.1°C）。对于在1.5 T下使用正交驱动线圈的身体成像，在10分钟扫描期间，所有成像标志处的ΔT保持<3°C， <6 ℃。对于3 T下的身体成像，10分钟扫描期间的ΔT在所有成像标志处保持<6°C。对于长达2分钟的较短脉冲序列，ΔT保持<6°C，对于基于研究的6名患者的模型，模拟表明，使用1.5 T和3T的局部头部线圈以及1.5 T的体线圈可以安全地进行MRI，并产生脉冲。在这些患者中，可以安全地使用脉冲进行3T MRI。
To evaluate the local SAR and heating around retained cardiac leads during MRI at 64 MHz (1.5 T) and 127 MHz (3 T) as a function of RF coil type and imaging landmark. Numerical models of retained cardiac leads were built from CT and X-ray images of six patients with retained cardiac leads. Electromagnetic simulations and bio-heat modeling were performed with MRI RF body and head coils tuned to 64 MHz and 127 MHz and positioned at nine different imaging landmarks covering an area from the head to the lower limbs. For all patients and at both 1.5 T and 3 T, local transmit head coils produced negligible temperature rise (ΔT < 0.1°C) for . For body imaging with quadrature-driven coils at 1.5 T, ΔT during a 10-minute scan remained <3°C at all imaging landmarks for and <6°C for . For body imaging at 3 T, ΔT during a 10-minute scan remained <6°C at all imaging landmarks for . For shorter pulse sequences up to 2 minutes, ΔT remained <6°C for , For the models based on six patients studied, simulations suggest that MRI could be performed safely using a local head coil at both 1.5 T and 3T, and with a body coil at 1.5 T with pulses that produced . MRI at 3 T could be performed safely in these patients using pulses with .
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