Document Detail

Geometrical accuracy and fusion of multimodal vascular images: a phantom study.
MedLine Citation:
PMID:  15259646     Owner:  NLM     Status:  MEDLINE    
The aim of this work was to compare the geometrical accuracy of x-ray angiography, magnetic resonance imaging (MRI), x-ray computed tomography (XCT), and ultrasound imaging (B-mode and IVUS, or intravascular ultrasound) for measuring the lumen diameters of blood vessels. An image fusion method was also developed to improve these measurements. The images were acquired from a phantom that mimic vessels of known diameters. After acquisition, the multimodal images were coregistered by manual alignment of fiducial markers, and then by maximization of mutual information. The fusion method was performed by means of a fuzzy logic modeling approach followed by a combination process based on a possibilistic theory. The results showed (i) the better geometrical accuracy of XCT and IVUS compared to the other modalities, and (ii) the better accuracy and smaller variability of fused images compared to single modalities, with respect to most diameters investigated. For XCT, the error varied from 0.4% to 5.4%, depending on the vessel diameter that ranged from 0.93 to 6.24 mm. For IVUS, the error ranged from -0.3% to 1.7% but the smallest vessel (0.93 mm) could not be investigated because of the probe size. Compared to others fusion schemes, the XCT-MRI fused images provided the best results for both accuracy (from -1.6% to 0.2% for the three largest vessels) and robustness (mean relative error of 1.9%). To conclude, this work underlined both the usefulness of the multimodality vascular phantom as a validation tool and the utility of image fusion in the vascular context.
Nicolas Boussion; Gilles Soulez; Jacques A De Guise; Michel Daronat; Zhao Qin; Guy Cloutier
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Publication Detail:
Type:  Comparative Study; Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Medical physics     Volume:  31     ISSN:  0094-2405     ISO Abbreviation:  Med Phys     Publication Date:  2004 Jun 
Date Detail:
Created Date:  2004-07-19     Completed Date:  2005-01-14     Revised Date:  2008-11-21    
Medline Journal Info:
Nlm Unique ID:  0425746     Medline TA:  Med Phys     Country:  United States    
Other Details:
Languages:  eng     Pagination:  1434-43     Citation Subset:  IM    
Laboratory of Biorheology and Medical Ultrasonics, Research Center, University of Montreal Hospital, Québec H2L 2W5, Canada.
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MeSH Terms
Biophysical Phenomena
Blood Vessels / anatomy & histology*,  ultrasonography
Image Processing, Computer-Assisted
Magnetic Resonance Angiography
Models, Anatomic
Phantoms, Imaging*
Tomography, X-Ray Computed

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