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Author
Aura Hernandez-Sabate; Debora Gil; Albert Teis
Title
How Do Conservation Laws Define a Motion Suppression Score in In-Vivo Ivus Sequences?
Type
Conference Article
Year
2007
Publication
Proc. IEEE Ultrasonics Symp
Abbreviated Journal
Volume
Issue
Pages
2231-2234
Keywords
validation standards; IVUS motion compensation; conservation laws.
Abstract
Evaluation of arterial tissue biomechanics for diagnosis and treatment of cardiovascular diseases is an active research field in the biomedical imaging processing area. IntraVascular UltraSound (IVUS) is a unique tool for such assessment since it reflects tissue morphology and deformation. A proper quantification and visualization of both properties is hindered by vessel structures misalignments introduced by cardiac dynamics. This has encouraged development of IVUS motion compensation techniques. However, there is a lack of an objective evaluation of motion reduction ensuring a reliable clinical application This work reports a novel score, the Conservation of Density Rate (CDR), for validation of motion compensation in in-vivo pullbacks. Synthetic experiments validate the proposed score as measure of motion parameters accuracy; while results in in vivo pullbacks show its reliability in clinical cases.
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Series Title
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Series Issue
Edition
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Notes
IAM
Approved
no
Call Number
IAM @ iam @ HTG2007
Serial
1550
Permanent link to this record
Author
Jaume Garcia; Albert Andaluz; Debora Gil; Francesc Carreras
Title
Decoupled External Forces in a Predictor-Corrector Segmentation Scheme for LV Contours in Tagged MR Images
Type
Conference Article
Year
2010
Publication
32nd Annual International Conference of the IEEE Engineering in Medicine and Biology Society
Abbreviated Journal
Volume
Issue
Pages
4805-4808
Keywords
Abstract
Computation of functional regional scores requires proper identification of LV contours. On one hand, manual segmentation is robust, but it is time consuming and requires high expertise. On the other hand, the tag pattern in TMR sequences is a problem for automatic segmentation of LV boundaries. We propose a segmentation method based on a predictorcorrector (Active Contours – Shape Models) scheme. Special stress is put in the definition of the AC external forces. First, we introduce a semantic description of the LV that discriminates myocardial tissue by using texture and motion descriptors. Second, in order to ensure convergence regardless of the initial contour, the external energy is decoupled according to the orientation of the edges in the image potential. We have validated the model in terms of error in segmented contours and accuracy of regional clinical scores.
Address
Buenos Aires (Argentina)
Corporate Author
IEEE EMB
Thesis
Publisher
Place of Publication
Editor
Language
Summary Language
Original Title
Series Editor
Series Title
Abbreviated Series Title
Series Volume
Series Issue
Edition
ISSN
1557-170X
ISBN
978-1-4244-4123-5
Medium
Area
Expedition
Conference
EMBC
Notes
IAM
Approved
no
Call Number
IAM @ iam @ GAG2010
Serial
1514
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