1.5T MRI下圆形外固定物MRI射频加热数值研究

Xin Huang, Zhichao Wang, Ji Chen, Jianfeng Zheng
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引用次数: 1

摘要

在磁共振成像(MRI)环境中,由于患者体内射频(RF)能量吸收引起的组织加热是患者MRI相关安全问题的主要关注点之一,特别是存在较大的金属植入物,如圆形外固定装置。本文提出了一种新的方法来评估环形外固定装置的MRI射频诱导加热效应,利用创新的腿模。为了研究圆形外固定装置的射频加热机理和行为,对螺钉和导线数量、环架直径、支撑杆长度和插入角度等重要几何参数进行了数值模拟。数值结果表明,螺杆数量少、环架尺寸大、支撑杆长度较大、最大插入角朝外等非丝结构可能导致最坏情况下的MRI射频线圈发热。1克以上的峰值空间平均比吸收率(SAR)可达341.3 W/kg,全身SAR为2 W/kg。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Numerical Study on MRI RF Heating for Circular External Fixators under 1.5T MRI
Tissue heating due to radio frequency (RF) energy absorption in human body for patients in a Magnetic Resonance Imaging (MRI) environment is one of the primary concerns about MRI related safety issues for patients, especially with the presence of sizable metal implants such as circular external fixation devices. This paper proposes a novel method to evaluate the MRI RF induced heating effects of circular external fixation devices utilizing an innovative leg phantom. A number of essential geometrical parameters, i.e. number of screws and wires, ring frame diameter, strut length, and insertion angle were numerically investigated to study the RF induced heating mechanism and behaviors of circular external fixation devices. Numerical results suggest that non-wire configuration with fewer screws, large ring frame size, relatively large strut length and the maximum insertion angle pointing outwards may lead to the worst case MRI RF coil induced heating. The peak spatial average specific absorption rate (SAR) over 1 gram can approach 341.3 W/kg with a 2 W/kg whole body SAR.
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