Institute for Biomedical Imaging, Hamburg University of Technology, Hamburg, DE 21073, Germany.
Institute of Medical Engineering, Universität zu Lübeck, Lübeck, DE 23562, Germany.
ACS Nano. 2020 Oct 27;14(10):13913-13923. doi: 10.1021/acsnano.0c06326. Epub 2020 Sep 25.
Magnetic particle imaging (MPI) is an innovative radiation-free tomographic imaging method providing excellent temporal resolution, contrast, sensitivity, and safety. Mobile human MPI prototypes suitable for continuous bedside monitoring of whole-brain perfusion have been developed. However, for the clinical translation of MPI, a crucial gap in knowledge still remains: while MPI can visualize the reduction in blood flow and tissue perfusion in cerebral ischemia, it is unclear whether MPI works in intracranial hemorrhage. Our objective was to investigate the capability of MPI to detect intracranial hemorrhage in a murine model. Intracranial hemorrhage was induced through the injection of collagenase into the striatum of C57BL/6 mice. After the intravenous infusion of a long-circulating MPI-tailored tracer consisting of superparamagnetic iron oxides, we detected the intracranial hemorrhage in less than 3 min and could monitor hematoma expansion in real time. Multicontrast MPI can distinguish tracers based on their physical characteristics, core size, temperature, and viscosity. By employing multicontrast MPI, we were able to differentiate areas of liquid and coagulated blood within the hematoma, which could provide valuable information in surgical decision making. Multicontrast MPI also enabled simultaneous imaging of hemorrhage and cerebral perfusion, which is essential in the care of critically ill patients with increased intracranial pressure. We conclude that MPI can be used for real-time diagnosis of intracranial hemorrhage. This work is an essential step toward achieving the clinical translation of MPI for point-of-care monitoring of different stroke subtypes.
磁共振粒子成像(MPI)是一种创新的无辐射层析成像方法,提供了出色的时间分辨率、对比度、灵敏度和安全性。已经开发出适合连续床边监测全脑灌注的移动人体 MPI 原型。然而,对于 MPI 的临床转化,仍然存在一个关键的知识差距:虽然 MPI 可以可视化脑缺血时血流和组织灌注的减少,但尚不清楚 MPI 是否适用于颅内出血。我们的目标是研究 MPI 在小鼠模型中检测颅内出血的能力。通过将胶原酶注入 C57BL/6 小鼠的纹状体中来诱导颅内出血。在静脉输注由超顺磁氧化铁组成的长循环 MPI 定制示踪剂后,我们在不到 3 分钟的时间内检测到颅内出血,并能够实时监测血肿扩大。多对比 MPI 可以根据其物理特性、核心大小、温度和粘度来区分示踪剂。通过使用多对比 MPI,我们能够区分血肿内的液体和凝固血液区域,这在手术决策中提供了有价值的信息。多对比 MPI 还能够同时对出血和脑灌注进行成像,这对于颅内压升高的重症患者的护理至关重要。我们得出结论,MPI 可用于实时诊断颅内出血。这项工作是实现 MPI 用于不同类型中风的即时护理监测的临床转化的重要一步。
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