Document Detail


Nonstationary noise characteristics of the helical scan and its impact on image quality and artifacts.
MedLine Citation:
PMID:  9304565     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
Helical computed tomography has replaced the conventional step-and-shoot CT in many clinical applications. Because of its clinical importance, a number of comparative studies have been performed to evaluate its performance parameters, such as the noise and the slice sensitivity profile. In this paper, the nonstationary noise characteristics of helical images are carefully examined. Their impact on the low contrast detectability and three-dimensional (3-D) image artifacts is assessed. An analytical equation is derived to relate the interactions between various helical reconstruction schemes and the fan-beam filtered backprojection algorithm. We demonstrate that for many popular helical weights, the noise variation within the field of view of the reconstruction is close to a factor of 3. Several approaches to overcome the undesired characteristics are proposed.
Authors:
J Hsieh
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Medical physics     Volume:  24     ISSN:  0094-2405     ISO Abbreviation:  Med Phys     Publication Date:  1997 Sep 
Date Detail:
Created Date:  1997-11-24     Completed Date:  1997-11-24     Revised Date:  2008-11-21    
Medline Journal Info:
Nlm Unique ID:  0425746     Medline TA:  Med Phys     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  1375-84     Citation Subset:  IM    
Affiliation:
Applied Science Laboratory, G.E. Medical Systems, Milwaukee, Wisconsin 53201, USA.
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MeSH Terms
Descriptor/Qualifier:
Algorithms
Biophysical Phenomena
Biophysics
Computer Simulation
Humans
Radiographic Image Interpretation, Computer-Assisted
Tomography, X-Ray Computed / methods*,  statistics & numerical data

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