Multi-sheet surface rebinning methods for reconstruction from asymmetrically truncated cone beam projections: I. Approximation and optimality

Multi-sheet surface rebinning methods for reconstruction from asymmetrically truncated cone beam projections: I. Approximation and optimality
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用于从不对称截锥束投影重建的多片表面重组方法:I. 近似和最优性

DOI:
10.1088/0266-5611/29/11/115003
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发表时间:
2013
期刊:
影响因子:
2.1
通讯作者:
Betcke M
Betcke M
中科院分区:
数学2区
文献类型:
--
作者:
Betcke M

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传统锥形束CT扫描器中的机架的机械运动限制了具有接近真实的时间要求的应用中的数据采集速度。这个问题的一个可能的解决方案是用电子激活的静态部件代替移动源检测器组件。这种系统的一个例子是Rapiscan Systems RTT 80真实的时间断层摄影扫描器,具有源的静态环和检测器的轴向偏移静态圆柱。这种设计的结果是锥束投影的不对称轴向截断,在积分几何意义上,导致严重不完整的数据。特别是,我们只收集数据的一小部分的Tam-Danielsson窗口,因此标准的锥形束重建技术不适用。在这项工作中,我们提出了一个家庭的多片表面重组方法重建从这样的截断投影。所提出的方法结合联合收割机的分析和数值的想法,利用线性的射线变换重建数据的多片表面上,从体积图像是通过反卷积获得。在本系列的第一篇论文中,我们讨论了多张曲面的重组。特别是,我们集中在多张表面上的基本变换和它们的近似与偏移多源扫描几何形状,如RTT收集的数据。最佳的多片表面和相应的重组功能被发现作为一个变分问题的解决方案。在二次目标的情况下,最优重组对的变分问题可以通过全局收敛的迭代来求解。最佳重组对的例子计算不同的轨迹。我们制定的轴向反卷积问题的体积图像的恢复重建多片表面。反卷积问题的有效和稳定的解决方案是本系列第二篇论文的主题(Betcke和Lionheart 2013年逆问题29 115004)。
The mechanical motion of the gantry in conventional cone beam CT scanners restricts the speed of data acquisition in applications with near real time requirements. A possible resolution of this problem is to replace the moving source detector assembly with static parts that are electronically activated. An example of such a system is the Rapiscan Systems RTT80 real time tomography scanner, with a static ring of sources and axially offset static cylinder of detectors. A consequence of such a design is asymmetrical axial truncation of the cone beam projections resulting, in the sense of integral geometry, in severely incomplete data. In particular we collect data only in a fraction of the Tam–Danielsson window, hence the standard cone beam reconstruction techniques do not apply. In this work we propose a family of multi-sheet surface rebinning methods for reconstruction from such truncated projections. The proposed methods combine analytical and numerical ideas utilizing linearity of the ray transform to reconstruct data on multi-sheet surfaces, from which the volumetric image is obtained through deconvolution. In this first paper in the series, we discuss the rebinning to multi-sheet surfaces. In particular we concentrate on the underlying transforms on multi-sheet surfaces and their approximation with data collected by offset multi-source scanning geometries like the RTT. The optimal multi-sheet surface and the corresponding rebinning function are found as a solution of a variational problem. In the case of the quadratic objective, the variational problem for the optimal rebinning pair can be solved by a globally convergent iteration. Examples of optimal rebinning pairs are computed for different trajectories. We formulate the axial deconvolution problem for the recovery of the volumetric image from the reconstructions on multi-sheet surfaces. Efficient and stable solution of the deconvolution problem is the subject of the second paper in this series (Betcke and Lionheart 2013 Inverse Problems 29 115004).
锥束多层螺旋计算机断层扫描的一般表面重建。
DOI: --
发表时间: 2003
期刊: Medical Physics (Lancaster)
影响因子: --
作者:
L. Chen;Yun Liang;D. Heuscher
通讯作者: D. Heuscher
DOI: 10.1109/nssmic.1999.845801
发表时间: 1999
期刊: 1999 IEEE Nuclear Science Symposium. Conference Record. 1999 Nuclear Science Symposium and Medical Imaging Conference (Cat. No.99CH37019)
影响因子: --
作者:
H. Turbell;P. Danielsson
通讯作者: P. Danielsson
DOI: 10.1088/0266-5611/29/11/115004
发表时间: 2013
期刊: Inverse Problems
影响因子: 2.1
作者:
Betcke M
通讯作者: Betcke M
DOI: --
发表时间: 2000
期刊: Medical Imaging: Image Processing
影响因子: --
作者:
M. Kachelriess;S. Schaller;W. Kalender
通讯作者: W. Kalender