Dynamic detector offsets for field of view extension in C-arm computed tomography with application to weight-bearing imaging.

Dynamic detector offsets for field of view extension in C-arm computed tomography with application to weight-bearing imaging.
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用于 C 形臂计算机断层扫描视野扩展的动态探测器偏移及其在承重成像中的应用

DOI:
10.1118/1.4915542
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发表时间:
2015
期刊:
影响因子:
3.8
通讯作者:
A. Maier
A. Maier
中科院分区:
医学3区
文献类型:
--
作者:
M. Herbst;F. Schebesch;M. Berger;J.-H. Choi;R. Fahrig;J. Hornegger;A. Maier

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目的:在C形臂计算机断层扫描(CT)中,视场(FOV)通常不足以采集某些解剖结构,例如,完整的臀部或胸部所提出的扩展FOV的方法使用固定的探测器位移和360°扫描范围来使FOV的半径加倍。这些轨迹是为圆形FOV设计的。然而,在某些情况下,所需的FOV不是圆形的,而是一个椭圆体。方法:在这项工作中,作者表明,在扇形束CT,使用动态调整探测器偏移可以减少所需的扫描范围时,使用非圆形FOV。此外,作者提出了一个分析的解决方案,以确定所需的最小扫描范围为椭圆FOV给定一定的检测器的大小和算法的方法为任意FOVs.Results:作者表明,所提出的方法可以导致所需的扫描范围大幅减少。我们的新的最小轨迹获得的数据集的初始重建产生的图像质量相比,使用一个固定的检测器偏移和一个完整的360° rotation.Conclusions:我们的研究结果显示了一个有前途的减少必要的扫描范围,特别是椭圆体的对象,延长FOV的重建数据。在非圆形FOV中,存在一组允许在探测器尺寸和扫描范围之间进行权衡的解决方案。
Purpose:In C‐arm computed tomography (CT), the field of view (FOV) is often not sufficient to acquire certain anatomical structures, e.g., a full hip or thorax. Proposed methods to extend the FOV use a fixed detector displacement and a 360° scan range to double the radius of the FOV. These trajectories are designed for circular FOVs. However, there are cases in which the required FOV is not circular but rather an ellipsoid.Methods:In this work, the authors show that in fan‐beam CT, the use of a dynamically adjusting detector offset can reduce the required scan range when using a noncircular FOV. Furthermore, the authors present an analytic solution to determine the minimal required scan ranges for elliptic FOVs given a certain detector size and an algorithmic approach for arbitrary FOVs.Results:The authors show that the proposed method can result in a substantial reduction of the required scan range. Initial reconstructions of data sets acquired with our new minimal trajectory yielded image quality comparable to reconstructions of data acquired using a fixed detector offset and a full 360° rotation.Conclusions:Our results show a promising reduction of the necessary scan range especially for ellipsoidal objects that extend the FOV. In noncircular FOVs, there exists a set of solutions that allow a trade‐off between detector size and scan range.
DOI: 10.1118/1.3633901
发表时间: 2011-11-01
期刊: MEDICAL PHYSICS
影响因子: 3.8
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Maier, Andreas;Wigstrom, Lars;Fahrig, Rebecca
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DOI: --
发表时间: 2006
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