Sedlacik Jan, Frölich Andreas, Spallek Johanna, Forkert Nils D, Faizy Tobias D, Werner Franziska, Knopp Tobias, Krause Dieter, Fiehler Jens, Buhk Jan-Hendrik
Department of Neuroradiology, University Medical Center Hamburg-Eppendorf, Hamburg, Germany.
Department of Product Development and Mechanical Engineering Design, Hamburg University of Technology, Hamburg, Germany.
PLoS One. 2016 Aug 5;11(8):e0160097. doi: 10.1371/journal.pone.0160097. eCollection 2016.
PURPOSE: The purpose of this work was to demonstrate the capability of magnetic particle imaging (MPI) to assess the hemodynamics in a realistic 3D aneurysm model obtained by additive manufacturing. MPI was compared with magnetic resonance imaging (MRI) and dynamic digital subtraction angiography (DSA). MATERIALS AND METHODS: The aneurysm model was of saccular morphology (7 mm dome height, 5 mm cross-section, 3-4 mm neck, 3.5 mm parent artery diameter) and connected to a peristaltic pump delivering a physiological flow (250 mL/min) and pulsation rate (70/min). High-resolution (4 h long) 4D phase contrast flow quantification (4D pc-fq) MRI was used to directly assess the hemodynamics of the model. Dynamic MPI, MRI, and DSA were performed with contrast agent injections (3 mL volume in 3 s) through a proximally placed catheter. RESULTS AND DISCUSSION: 4D pc-fq measurements showed distinct pulsatile flow velocities (20-80 cm/s) as well as lower flow velocities and a vortex inside the aneurysm. All three dynamic methods (MPI, MRI, and DSA) also showed a clear pulsation pattern as well as delayed contrast agent dynamics within the aneurysm, which is most likely caused by the vortex within the aneurysm. Due to the high temporal resolution of MPI and DSA, it was possible to track the contrast agent bolus through the model and to estimate the average flow velocity (about 60 cm/s), which is in accordance with the 4D pc-fq measurements. CONCLUSIONS: The ionizing radiation free, 4D high resolution MPI method is a very promising tool for imaging and characterization of hemodynamics in human. It carries the possibility of overcoming certain disadvantages of other modalities like considerably lower temporal resolution of dynamic MRI and limited 2D characteristics of DSA. Furthermore, additive manufacturing is the key for translating powerful pre-clinical techniques into the clinic.
目的:本研究旨在展示磁粒子成像(MPI)评估通过增材制造获得的真实三维动脉瘤模型中血流动力学的能力。将MPI与磁共振成像(MRI)和动态数字减影血管造影(DSA)进行比较。 材料与方法:动脉瘤模型为囊状形态(穹顶高度7mm,横截面5mm,颈部3 - 4mm,母动脉直径3.5mm),连接到蠕动泵以输送生理流量(250mL/min)和搏动频率(70次/分钟)。使用高分辨率(4小时长)的四维相位对比血流定量(4D pc-fq)MRI直接评估模型的血流动力学。通过近端放置的导管注射造影剂(3秒内注射3mL)进行动态MPI、MRI和DSA检查。 结果与讨论:4D pc-fq测量显示出明显的搏动血流速度(20 - 80cm/s)以及较低的血流速度和动脉瘤内的涡流。所有三种动态方法(MPI、MRI和DSA)还显示出清晰的搏动模式以及动脉瘤内造影剂动力学延迟,这很可能是由动脉瘤内的涡流引起的。由于MPI和DSA的高时间分辨率,可以追踪造影剂团块通过模型并估计平均血流速度(约60cm/s),这与4D pc-fq测量结果一致。 结论:无电离辐射的四维高分辨率MPI方法是用于人体血流动力学成像和特征描述的非常有前景的工具。它有可能克服其他模态的某些缺点,如动态MRI的时间分辨率低得多以及DSA的二维特征有限。此外,增材制造是将强大的临床前技术转化为临床应用的关键。
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