CONTRAST ENHANCED 4D PHASE CONTRAST IMAGING

导语：传统的磁共振成像不是最理想的 实时介入使用。成像参数的更改可能需要 几十秒才能在图像中反映出来。在以下各项之间切换 脉冲序列类型需要数十秒。成像平面 在连续扫描过程中不能轻易修改。2DFT成像是 固有的时间分辨率限制，并且显示延迟禁止 设备的连续运动或重新定位。实时的目标 交互式核磁共振旨在最大限度地提高时间分辨率、最小化显示 延迟，并允许在连续扫描期间进行交互控制。一个 像这样的界面是实现连续 与其他设备一样重新定位介入性设备 指导模式。方法/结果：我们正在与John合作 保利和亚当·科尔在电气工程系 使他们的实时重建系统适应于 在我们的介入系统中使用标准的全身机器。我们有 研究了圆形EPI k空间轨迹在这方面的应用 用途，并已安装Quad Ross Hypersparc处理器 SPARC工作站。这些处理器改善了我们的重建和 显示速度惊人。与透视方法相比， 评估，MR没有相关的电离辐射，并且有 能够在任何平面上获取图像。结论：实时 交互式MRI是一种很有前途的介入性MRI成像方法。 我们目前正在开发快速成像方法，很快就会转向 对这些方法进行临床评估。

Introduction: Conventional MR imaging is not optimal for real-time interventional use. Changes in imaging parameters can take tens of seconds to be reflected in the images. Switching between pulse sequence types requires tens of seconds. The imaging plane cannot be easily modified during continuous scanning. 2DFT imaging is inherently limited in temporal resolution, and display lag prohibits continuous motion or repositioning of devices. The aims of real-time interactive MRI are to maximize temporal resolution, minimize display lag, and allow interactive control during continuous scanning. An interface such as this is the key to enabling the continuous repositioning of interventional devices as is possible with other guidance modalities. Methods/Results: We are collaborating with John Pauly and Adam Kerr in the department of Electrical Engineering to adapt their real-time reconstruction system which was developed for a standard whole body machine to our interventional system. We have investigated the use of circular EPI k-space trajectory for this purpose and have installed Quad Ross hypersparc processors on the sparc workstation. These processors improve our reconstruction and display rate dramatically. In contrast to fluoroscopic methods of evaluation, MR has no associated ionizing radiation and has the ability to acquire images in any plane. Conclusions: Real-time interactive MRI is a promising imaging method for interventional MRI. We are currently developing rapid imaging methods and will soon turn to a clinical evaluation of these methods.