Visualization of Active Devices and Automatic Slice Repositioning ("Snap To") for MRI-Guided Interventions
Visualization of Active Devices and Automatic Slice Repositioning ("Snap To") for MRI-Guided Interventions
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DOI：
10.1002/mrm.22307
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发表时间：
2010-04-01
影响因子：
3.3
通讯作者：
Faranesh, Anthony Z.
中科院分区：
文献类型：
--
作者：
George, Ashvin K.;Derbyshire, J. Andrew;Faranesh, Anthony Z.
介入设备的准确可视化对于磁共振引导介入治疗的安全性和有效性至关重要。在本文中，我们介绍了一种对有源器件可视化的改进。关键的组成部分是一种快速、健壮的方法(“曲线查找”)，它可以在几分之一秒内从投影图像中重建设备的三维轨迹。曲线查找是一种迭代预测-校正算法，作用于正交投影图像的乘积。通过改变步长和搜索方向，它对信号的不均匀具有很强的鲁棒性。在触摸按键时，被成像的切片被重新定位以包含设备的相关部分(SnapTo)，在三维显示器中绘制设备的曲线，并且显示设备将与之相交的目标切片上的点。这些功能已被整合到实时核磁共振系统中。体外和活体(在猪身上)的实验已经使用各种单通道和多通道设备产生了成功的结果，这些设备旨在产生空间连续和离散的信号。曲线查找通常能够重建设备曲线，平均误差约为2 mm，即使在复杂几何图形的情况下也是如此。《医学评论》63：1070-1079,2010。(C)2010年Wiley-Liss公司
The accurate visualization of interventional devices is crucial for the safety and effectiveness of MRI-guided interventional procedures. In this paper, we introduce an improvement to the visualization of active devices. The key component is a fast, robust method ("Curve Find") that reconstructs the three-dimensional trajectory of the device from projection images in a fraction of a second. Curve Find is an iterative prediction-correction algorithm that acts on a product of orthogonal projection images. By varying step size and search direction, it is robust to signal inhomogeneities. At the touch of a key, the imaged slice is repositioned to contain the relevant section of the device ("SnapTo"), the curve of the device is plotted in a three-dimensional display, and the point on a target slice, which the device will intersect, is displayed. These features have been incorporated into a real-time MRI system. Experiments in vitro and in vivo (in a pig) have produced successful results using a variety of single- and multichannel devices designed to produce both spatially continuous and discrete signals. Curve Find is typically able to reconstruct the device curve, with an average error of approximately 2 mm, even in the case of complex geometries. Magn Reson Med 63:1070-1079, 2010. (C) 2010 Wiley-Liss, Inc.