Title
Quantitative evaluation of ASiR image quality : an adaptive statistical iterative reconstruction technique
Author
Faculty/Department
Faculty of Sciences. Physics
Faculty of Medicine and Health Sciences
Publication type
conferenceObject
Publication
Subject
Physics
Human medicine
Source (journal)
Proceedings of SPIE
Volume/pages
8313(2012) , 5 p.
ISSN
0277-786X
Article Reference
83133F
ISI
000304768000118
Carrier
E-only publicatie
Target language
English (eng)
Full text (Publishers DOI)
Affiliation
University of Antwerp
Abstract
Adaptive statistical iterative reconstruction (ASiR) is a new reconstruction algorithm used in the field of medical X-ray imaging. This new reconstruction method combines the idealized system representation, as we know it from the standard Filtered Back Projection (FBP) algorithm, and the strength of iterative reconstruction by including a noise model in the reconstruction scheme. It studies how noise propagates through the reconstruction steps, feeds this model back into the loop and iteratively reduces noise in the reconstructed image without affecting spatial resolution. In this paper the effect of ASiR on the contrast to noise ratio is studied using the low contrast module of the Catphan phantom. The experiments were done on a GE LightSpeed VCT system at different voltages and currents. The results show reduced noise and increased contrast for the ASiR reconstructions compared to the standard FBP method. For the same contrast to noise ratio the images from ASiR can be obtained using 60% less current, leading to a reduction in dose of the same amount.
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