scholarly journals Note: A data acquisition system for a high phase contrast medical computed tomography prototype

2018 ◽  
Vol 89 (7) ◽  
pp. 076106
Author(s):  
Rongqi Sun ◽  
Lian Chen ◽  
Wenbin Wei ◽  
Ge Jin
Keyword(s):  
Computed Tomography ◽  
Data Acquisition ◽  
Phase Contrast ◽  
Data Acquisition System ◽  
Acquisition System ◽  
High Phase

scholarly journals Direct Fan-Beam Reconstruction Algorithm via Filtered Backprojection for Differential Phase-Contrast Computed Tomography

2008 ◽  
Vol 2008 ◽  
pp. 1-8 ◽  
Author(s):  
Zhihua Qi ◽  
Guang-Hong Chen
Keyword(s):  
Computed Tomography ◽  
Image Reconstruction ◽  
Data Acquisition ◽  
Phase Contrast ◽  
Reconstruction Algorithm ◽  
Data Acquisition System ◽  
Acquisition System ◽  
Filtered Backprojection ◽  
Differential Phase ◽  
Differential Phase Contrast

Recently, a novel data acquisition method has been proposed and experimentally implemented for differential phase-contrast computed tomography (DPC-CT), in which a conventional X-ray tube and a Talbot-Lau-type interferometer were utilized in data acquisition. The divergent nature of the data acquisition system requires a divergent-beam image reconstruction algorithm for DPC-CT. This paper focuses on addressing this image reconstruction issue. We have developed a filtered backprojection algorithm to directly reconstruct the DPC-CT images from acquired fan-beam data. The developed algorithm allows one to directly reconstruct the decrement of the real part of the refractive index from the measured data. In order to accurately reconstruct an image, the data need to be acquired over an angular range of at least 180∘ plus the fan angle. As opposed to the parallel beam data acquisition and reconstruction methods, a 180∘-rotation angle for the data acquisition system does not provide sufficient data for an accurate reconstruction of the entire field of view. Numerical simulations have been conducted to validate the image reconstruction algorithm.

A CMOS photodiode array with in-pixel data acquisition system for computed tomography

2004 ◽  
Vol 39 (7) ◽  
pp. 1034-1043 ◽  
Author(s):  
R. Steadman ◽  
F.M. Serrano ◽  
G. Vogtmeier ◽  
A. Kemna ◽  
E. Oezkan ◽  
...  
Keyword(s):  
Computed Tomography ◽  
Data Acquisition ◽  
Data Acquisition System ◽  
Acquisition System ◽  
Photodiode Array
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