相关实验视频

Updated: Jan 17, 2026

Protocol for the Evaluation of MRI Artifacts Caused by Metal Implants to Assess the Suitability of Implants and the Vulnerability of Pulse Sequences

Protocol for the Evaluation of MRI Artifacts Caused by Metal Implants to Assess the Suitability of Implants and the Vulnerability of Pulse Sequences

Published on: May 17, 2018

通过使用MRI测量诱导的射频电流来评估活跃植入物的射频安全性

Chiara Hartmann¹, Mélina Bouldi², Jan M Warnking¹

¹U1216, Grenoble Institut Neurosciences, Univ. Grenoble Alpes, Inserm, Grenoble, 38000, France.

Magnetic resonance in medicine

|September 13, 2025

概括

这项研究引入了一种新的MRI方法,用于量化活跃植入物中的射频 (RF) 电流,如深度大脑刺激线. 这允许在MRI扫描期间准确预测潜在的热病变.

科学领域:

医疗成像医学成像
生物医学工程生物医学工程
电磁学电磁学电磁学电磁学

背景情况:

活跃的植入物,如深度大脑刺激导线,在MRI期间由于诱导的射频 (RF) 电流而构成热损伤风险.
由于复杂的电磁相互作用,目前的方法无法在MRI期间评估植入物在现场射频安全性.
在植入物中量化RF电流对于确保MRI程序期间患者安全至关重要.

研究的目的:

提出一种新的方法来量化MRI期间活跃植入物的射频电流.
允许在MRI环境中对植入物进行现场安全评估.
预测诱导射频电流引起的热损伤的可能性.

主要方法:

一个修改的B1映射MRI序列被用于B1+场中由射频电流引起的图像扰动.
开发了一个前向信号模型,将射频电流强度与MRI信号特征联系起来.
电磁模拟和使用植入线的幻影实验被用于方法验证.

主要成果:

开发的方法准确地从模拟的场地图中重建了RF电流幅度,正常化的RMS误差为4.7%.
幻影实验表明,二次射频电流和温度增加之间存在强烈的线性相关性 (R2>0.91).
这些发现证实了基于MRI的射频电流测量量量上代表了有效的组织加热.

结论:

一种新方法使得使用MRI信号在现场定量活跃植入物中的射频电流.
这种技术可以预测各种MRI序列的个体加热风险.
开发的方法增强了接受MRI扫描的活跃植入物患者的安全性评估.

关键词:

对于MR的安全性来说,这是非常重要的.射频加热射频加热活跃植入式医疗器械 (AIMD) 是一种活跃的植入式医疗器械.深度大脑刺激 (DBS) 的方法无线电频率电流是什么意思

更多相关视频

Magnetic Resonance Imaging of Multiple Sclerosis at 7.0 Tesla

Magnetic Resonance Imaging of Multiple Sclerosis at 7.0 Tesla

Published on: February 19, 2021

Concurrent EEG and Functional MRI Recording and Integration Analysis for Dynamic Cortical Activity Imaging

Concurrent EEG and Functional MRI Recording and Integration Analysis for Dynamic Cortical Activity Imaging

Published on: June 30, 2018

相关概念视频

Magnetic Resonance Imaging

Magnetic Resonance Imaging

Magnetic resonance imaging (MRI) is a noninvasive medical imaging technique based on a phenomenon of nuclear physics discovered in the 1930s, in which matter exposed to magnetic fields and radio waves was found to emit radio signals. In 1970, a physician and researcher named Raymond Damadian noticed that malignant (cancerous) tissue gave off different signals than normal body tissue. He applied for a patent for the first MRI scanning device in clinical use by the early 1980s. The early MRI...

Imaging Studies for Cardiovascular System IV: CMRI

Imaging Studies for Cardiovascular System IV: CMRI

Cardiovascular magnetic resonance imaging, or CMRI, is a non-invasive diagnostic test that employs a magnetic field and radiofrequency waves to create precise images of the heart and arteries. It provides comprehensive information about cardiac anatomy, function, perfusion, and tissue characterization without ionizing radiation.IndicationsCMRI diagnoses various heart conditions, including tissue damage from heart attacks, ischemic heart disease, myocarditis, aortic issues (tears, aneurysms,...

Imaging Studies I: CT and MRI

Imaging Studies I: CT and MRI

Introduction: MRI and CT scans are crucial advancements in medical imaging techniques, playing a vital role in diagnosing conditions related to the gastrointestinal (GI) system. Each scan serves distinct purposes, targets specific areas, and requires unique nursing duties.
Description of the Procedures
Computed Tomography (CT) scan:
Computed Tomography (CT) scans use X-ray technology to generate detailed images of bones, organs, and tissues. During the scan, the patient lies on a moving table...

Imaging Studies IV: Magnetic Resonance Imaging

Imaging Studies IV: Magnetic Resonance Imaging

Introduction:Magnetic Resonance Imaging, or MRI, can include a specialized imaging technique of the urinary system known as Magnetic Resonance Urography (MRU). This radiation-free technique uses strong magnetic fields and radio waves to produce detailed images with the help of a computer. MRU is particularly effective for visualizing fluid-filled structures like the kidneys, ureters, and bladder.Applications of MRI in the Genitourinary SystemKidneys and Ureters: MRI detects tumors, cysts,...