一个原型射频穿透圆形PET插件在3T的MRI兼容性研究
Md Shahadat Hossain Akram1, Fumihiko Nishikido2, Craig S Levin3
1Department of Advanced Nuclear Medicine Sciences, Institute of Quantum Medical Science, National Institutes for Quantum Science and Technology (QST), 4-9-1 Anagawa, Inage, Chiba, 263-8555, Japan. hossain.akram@qst.go.jp.
Japanese journal of radiology
|December 19, 2023
概括
这项研究评估了一种新型PET插件的MRI兼容性,发现由于其射频屏蔽,信号噪声比 (SNR) 显著降低. 尽管面临挑战,但PET插件已被清除,用于开发更大的体型系统,用于集成PET-MRI成像.
科学领域:
- 医疗成像医学成像
- 生物医学工程 生物医学工程
- 辐射物理学 辐射物理学
背景情况:
- 集成正子发射断层扫描 (PET) 和磁共振成像 (MRI) 系统提供了协同的诊断能力.
- 开发与MRI兼容的PET插件对于推进同时获得PET-MRI至关重要.
- 在PET组件和MRI系统之间产生射频干扰是一个重大挑战.
研究的目的:
- 为了评估一个圆形的磁共振成像 (MRI) 兼容性,射频 (RF) 领域可穿透的PET插件.
- 为了评估集成系统的性能,当MRI的内置体RF线圈同时作为发射器和接收器.
- 为了确定原型PET插件在临床3特斯拉MRI扫描仪中的安全性和有效性.
主要方法:
- 使用十二个电动浮动的RF屏蔽探测器模块构建了一个原型的圆形PET插件 (440毫米大轴,350毫米小轴,225毫米轴长).
- 从探测器屏蔽中隔离电缆屏蔽,使用塑料带实现电浮.
- 在3T西门子VerioMRI系统中使用同质幻影对射频场 (B1),信号噪声比 (SNR) 和射频脉冲振幅进行研究.
主要成果:
- PET插件的B1场图与仅MRI反应相比.
- 观察到显著的SNR降低:51%的旋转回声,45%的梯度回声,59%的回声平面成像与仅MRI相比.
- 所需的射频脉冲振幅增加了1.93x (SE),1.85x (GE) 和1.36x (EPI),平均射频接收灵敏度下降了30%.
结论:
- 原型PET插件对临床MRI系统提出了安全考虑,但为未来的开发确定了兼容性.
- 射频屏蔽需要更高的射频功率,这有助于大幅减少SNR,并与机身线圈固有的低射频灵敏度相结合.
- 获准开发更大,体型的浮动PET插件用于现有MRI系统,为先进的综合成像铺平了道路.
相关概念视频
01:24Magnetic Resonance Imaging
5.2K
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...
5.2K
01:14Imaging Studies I: CT and MRI
250
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...
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...
250