Design of multi-row parallel-transmit coil arrays for enhanced SAR efficiency with deep brain electrodes at 3T: an electromagnetic simulation study.

IF 2 4区医学 Q3 RADIOLOGY, NUCLEAR MEDICINE & MEDICAL IMAGING

Magnetic Resonance Materials in Physics, Biology and Medicine Pub Date : 2024-11-14 DOI:10.1007/s10334-024-01212-4

Nejat Karadeniz, Joseph V Hajnal, Özlem Ipek

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引用次数: 0

Abstract

Objective: Tissue heating near the implanted deep brain stimulation (DBS) during magnetic resonance imaging (MRI) poses a significant safety constraint. This study aimed to evaluate the performance of parallel transmit (pTx) head transmit radiofrequency (RF) coils in DBS patients, with a focus on excitation fidelity under specific absorption rate (SAR) control for brain imaging at 3T MRI.

Materials and methods: We employed electromagnetic simulations to assess different coil configurations, including multi-row pTx coils of 16-24 channels arranged in 1, 2, and 3 rows, and compared these to a circularly polarised and pTx birdcage coil using a realistic human model without and with DBS leads and electrodes.

Results: Two- and three-row pTx coils with overlapping loop elements exhibited similar performance, which was superior in excitation homogeneity and local SAR compared to the single-row coil and the birdcage coil both without and with DBS.

Discussion: These findings suggest that multi-row coils can enhance the safety and efficacy of MRI in patients with DBS devices, so potentially improving imaging performance in this expanding patient population. There was a minimal difference in performance between the 2 and 3-row coils, favouring the simpler, lower channel count design for practical implementation.

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设计多排平行发射线圈阵列以提高 3T 下深部脑电极的 SAR 效率：电磁模拟研究。

目的：在磁共振成像（MRI）过程中，植入的脑深部刺激（DBS）装置附近的组织发热是一个重要的安全限制因素。本研究旨在评估并行传输（pTx）头发射射频（RF）线圈在 DBS 患者中的性能，重点是在特定吸收率（SAR）控制下的激励保真度，以便在 3T 磁共振成像中进行脑成像：我们利用电磁模拟评估了不同的线圈配置，包括 16-24 个通道的多排 pTx 线圈，并使用一个没有和带有 DBS 导联和电极的真实人体模型，将其与圆极化和 pTx 鸟笼线圈进行了比较：结果：具有重叠环路元件的两排和三排 pTx 线圈表现出相似的性能，与单排线圈和鸟笼线圈相比，在无 DBS 和有 DBS 的情况下，它们在激励均匀性和局部 SAR 方面都更胜一筹：讨论：这些研究结果表明，多排线圈可以提高使用 DBS 设备的患者进行磁共振成像的安全性和有效性，从而有可能改善这一不断扩大的患者群体的成像性能。2 排线圈和 3 排线圈的性能差异很小，因此在实际应用中更倾向于更简单、通道数更少的设计。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Magnetic Resonance Materials in Physics, Biology and Medicine 医学-核医学

CiteScore

4.60

自引率

0.00%

发文量

审稿时长

>12 weeks

期刊介绍： MAGMA is a multidisciplinary international journal devoted to the publication of articles on all aspects of magnetic resonance techniques and their applications in medicine and biology. MAGMA currently publishes research papers, reviews, letters to the editor, and commentaries, six times a year. The subject areas covered by MAGMA include: advances in materials, hardware and software in magnetic resonance technology, new developments and results in research and practical applications of magnetic resonance imaging and spectroscopy related to biology and medicine, study of animal models and intact cells using magnetic resonance, reports of clinical trials on humans and clinical validation of magnetic resonance protocols.