Real-time reconstruction for MR Angiography

这项研究项目的目的是开发基础技术，以取代目前使用的X射线成像在血管介入治疗中的磁共振成像。因此，我们开发了快速的磁共振图像采集和重建技术，以实时可视化器械的运动。利用快速投影脉冲序列，我们可以证明，通过立体显示和专用的MR序列修改，解剖的3D可视化是可能的。在本项目的继续期间，快速立体MR成像的有希望的结果将继续直接应用于MR系统，以控制和监督MR引导的血管内介入治疗。此外，血管的运动场将通过从磁共振相位对比数据和主动导管的位置测量中提取运动信息来估计。这项延续计划的目的是通过将先前开发的投影成像与完全与MR兼容的3D监视器相结合来创建一个针对复杂介入操作的全功能监督系统。通过集成来自相衬数据的运动信息，可以从MR原始数据中提取运动信息而几乎没有时间损失，将向其他项目合作伙伴提供用于重建3D模型的附加信息。通过将相位差数据与主动导管跟踪的位置信息进行比较，进行一致性测试，以避免仪器位置的编码错误。

The aim of this research project is the development of basic technologies to replace the currently used X-ray imaging by MR imaging in vascular interventions. Therefore, we have developed fast MR image acquisition and reconstruction techniques to visualize the movement of instruments in real time. With fast projection pulse sequences we could show that a 3D visualization of the anatomy is possible with a stereoscopic displays and dedicated MR sequence modifications.Within this project continuation the promising results of the fast stereoscopic MR imaging shall be continued to apply them directly at the MR system for the control and supervision of an MR-guided intravascular intervention. In addition, the motion field of the blood vessels will be estimated by extracting motion information from both MR phase contrast data as well as position measurements with active catheters.The aim of this continuation proposal is to create a fully functional supervision system for complex interventional procedures by a combination of the previously developed projection imaging with a fully MR-compatible 3D monitor. By integration of the motion information from phase contrast data which can be extracted from the MR raw data with nearly no time penalty, additional information for the reconstruction of 3D models will be provided to the other project partners. By comparison with the phase contrast data with position information from active catheter tracking consistency tests will be developed to avoid encoding errors of the instrument position.