Evaluation of the RF depositions at 3T in routine clinical scans with respect to the SAR safety to improve efficiency of MRI utilization

IF 1.3 4区 医学 Q4 ENGINEERING, BIOMEDICAL
Ruixin Li, Xinlian Chen, Yupeng Liao, Sherman Xuegang Xin
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Abstract

Objectives This study explores the potential for improving of 3T MRI utilization by assessing and tailoring RF exposure in routine clinical scans while complying to standard safety limit. Methods Using two generic human body models, we evaluated pbSAR10g values at four landmark positions (knee, pelvis, thoracic spine, head) at different wbSAR levels. Specifically, we analyzed local SAR10g in different operating modes and computed the maximum safety wbSAR, ensuring compliance with IEC limits. Results In normal operating mode, the RF power deposition reached wbSAR limit before the pbSAR10g limit. In the first level controlled operating mode, pbSAR10g limit is reached before the wbSAR limit in the knee, thoracic spine scanning scenarios, while the wbSAR limit is reached first in the pelvis scanning scenarios, making it the most potential-releasing (up to 33.33 %) scanning scenario. For head exposure, the head SAR10g limit is reached before the wbSAR limit, highlighting the necessity for strict SAR control. Moreover, we calculated the minimum allowable TR for common imaging sequences for reference. Conclusions Different RF exposure setups are necessary to meet safety standards in various scenarios. By implementing careful RF exposure setups in routine clinical scans, the high potential capacity of 3T MRI can be fully released.
评估常规临床扫描中 3T 下射频沉积的 SAR 安全性,以提高磁共振成像的使用效率
目的 本研究通过评估和调整常规临床扫描中的射频暴露,同时遵守标准安全限制,探索提高 3T 磁共振成像利用率的潜力。方法 我们使用两个通用人体模型,评估了四个地标位置(膝关节、骨盆、胸椎、头部)在不同 wbSAR 水平下的 pbSAR10g 值。具体来说,我们分析了不同工作模式下的局部 SAR10g,并计算了最大安全 wbSAR,确保符合 IEC 限制。结果 在正常工作模式下,射频功率沉积在达到 pbSAR10g 限制之前就达到了 wbSAR 限制。在一级受控运行模式下,膝关节、胸椎扫描方案的 pbSAR10g 值先于 wbSAR 值达到限值,而骨盆扫描方案的 wbSAR 值先达到限值,因此骨盆扫描方案是释放潜能最大的扫描方案(高达 33.33%)。就头部暴露而言,头部 SAR10g 限值先于 wbSAR 限值达到,这说明必须严格控制 SAR。此外,我们还计算了常见成像序列的最小允许 TR 值,以供参考。结论 不同的射频曝光设置对于满足各种情况下的安全标准是必要的。通过在常规临床扫描中实施谨慎的射频曝光设置,可以充分释放 3T 磁共振成像的巨大潜在能力。
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来源期刊
CiteScore
3.50
自引率
5.90%
发文量
58
审稿时长
2-3 weeks
期刊介绍: Biomedical Engineering / Biomedizinische Technik (BMT) is a high-quality forum for the exchange of knowledge in the fields of biomedical engineering, medical information technology and biotechnology/bioengineering. As an established journal with a tradition of more than 60 years, BMT addresses engineers, natural scientists, and clinicians working in research, industry, or clinical practice.
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