Discrete Estimation of Data Completeness for 3D Scan Trajectories with Detector Offset

Discrete Estimation of Data Completeness for 3D Scan Trajectories with Detector Offset
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具有探测器偏移的 3D 扫描轨迹数据完整性的离散估计

DOI:
10.1007/978-3-662-46224-9_10
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发表时间:
2015
影响因子:
3
通讯作者:
J. Hornegger
J. Hornegger
中科院分区:
医学4区
文献类型:
--
作者:
A. Maier;P. Kugler;G. Lauritsch;J. Hornegger

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CT扫描中源和检测器位置的顺序决定了可重构的体积和数据的完整性。通常在扫描仪的设计阶段就已经考虑到这一点。然而,现代平板扫描仪允许获得广泛的位置。这为不同的扫描路径提供了多种可能性。然而,每一条新的路径或轨迹都意味着不同的数据完整性。解析解要么是为特殊轨迹设计的,比如螺旋CT扫描的tam窗口,要么是不包括实际的探测器尺寸,比如Tuy条件。在本文中,我们描述了一种确定离散采样轨迹的体素数据完整性百分比的方法。这样,我们就可以对源和检测器位置的任何序列进行建模。利用这种方法,我们能够证实已知的理论,如图伊条件和数据完备性的轨迹,利用探测器偏移来增加视野。由于我们不需要轨迹的解析公式,因此该算法也将适用于任何其他源探测器路径或源探测器路径段集。
The sequence of source and detector positions in a CT scan determines reconstructable volume and data completeness. Commonly this is regarded already in the design phase of a scanner. Modern flatpanel scanners, however, allow to acquire a broad range of positions. This enables many possibilities for different scan paths. However, every new path or trajectory implies different data completeness. Analytic solutions are either designed for special trajectories like the Tam-window for helical CT scans or do not incorporate the actual detector size such as Tuy’s condition. In this paper, we describe a method to determine the voxel-wise data completeness in percent for discretely sampled trajectories. Doing so, we are able to model any sequence of source and detector positions. Using this method, we are able to confirm known theory such as Tuy’s condition and data completeness of trajectories using detector offset to increase the field-of-view. As we do not require an analytic formulation of the trajectory, the algorithm will also be applicable to any other sourcedetector-path or set of source-detector-path segments.
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DOI: 10.1007/978-3-642-54111-7_14
发表时间: 2014
期刊:
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作者:
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通讯作者: J. Hornegger
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发表时间: 2012-05-01
期刊: MEDICAL PHYSICS
影响因子: 3.8
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期刊: MEDICAL PHYSICS
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