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Author
Aura Hernandez-Sabate; Debora Gil;Eduard Fernandez-Nofrerias;Petia Radeva; Enric Marti
Title
Approaching Artery Rigid Dynamics in IVUS
Type
Journal Article
Year
2009
Publication
IEEE Transactions on Medical Imaging
Abbreviated Journal
TMI
Volume
28
Issue
11
Pages
1670-1680
Keywords
Fourier analysis; intravascular ultrasound (IVUS) dynamics; longitudinal motion; quality measures; tissue deformation.
Abstract
Tissue biomechanical properties (like strain and stress) are playing an increasing role in diagnosis and long-term treatment of intravascular coronary diseases. Their assessment strongly relies on estimation of vessel wall deformation. Since intravascular ultrasound (IVUS) sequences allow visualizing vessel morphology and reflect its dynamics, this technique represents a useful tool for evaluation of tissue mechanical properties. Image misalignment introduced by vessel-catheter motion is a major artifact for a proper tracking of tissue deformation. In this work, we focus on compensating and assessing IVUS rigid in-plane motion due to heart beating. Motion parameters are computed by considering both the vessel geometry and its appearance in the image. Continuum mechanics laws serve to introduce a novel score measuring motion reduction in in vivo sequences. Synthetic experiments validate the proposed score as measure of motion parameters accuracy; whereas results in in vivo pullbacks show the reliability of the presented methodologies in clinical cases.
Address
Corporate Author
Thesis
Publisher
Place of Publication
Editor
Language
Summary Language
Original Title
Series Editor
Series Title
Abbreviated Series Title
Series Volume
Series Issue
Edition
ISSN
0278-0062
ISBN
Medium
Area
Expedition
Conference
Notes
IAM; MILAB
Approved
no
Call Number
IAM @ iam @ HGF2009
Serial
1545
Permanent link to this record
Author
Aura Hernandez-Sabate; Debora Gil; Jaume Garcia; Enric Marti
Title
Image-based Cardiac Phase Retrieval in Intravascular Ultrasound Sequences
Type
Journal Article
Year
2011
Publication
IEEE Transactions on Ultrasonics, Ferroelectrics and Frequency Control
Abbreviated Journal
T-UFFC
Volume
58
Issue
1
Pages
60-72
Keywords
3-D exploring; ECG; band-pass filter; cardiac motion; cardiac phase retrieval; coronary arteries; electrocardiogram signal; image intensity local mean evolution; image-based cardiac phase retrieval; in vivo pullbacks acquisition; intravascular ultrasound sequences; longitudinal motion; signal extrema; time 36 ms; band-pass filters; biomedical ultrasonics; cardiovascular system; electrocardiography; image motion analysis; image retrieval; image sequences; medical image processing; ultrasonic imaging
Abstract
Longitudinal motion during in vivo pullbacks acquisition of intravascular ultrasound (IVUS) sequences is a major artifact for 3-D exploring of coronary arteries. Most current techniques are based on the electrocardiogram (ECG) signal to obtain a gated pullback without longitudinal motion by using specific hardware or the ECG signal itself. We present an image-based approach for cardiac phase retrieval from coronary IVUS sequences without an ECG signal. A signal reflecting cardiac motion is computed by exploring the image intensity local mean evolution. The signal is filtered by a band-pass filter centered at the main cardiac frequency. Phase is retrieved by computing signal extrema. The average frame processing time using our setup is 36 ms. Comparison to manually sampled sequences encourages a deeper study comparing them to ECG signals.
Address
Corporate Author
Thesis
Publisher
Place of Publication
Editor
Language
Summary Language
Original Title
Series Editor
Series Title
Abbreviated Series Title
Series Volume
Series Issue
Edition
ISSN
0885-3010
ISBN
Medium
Area
Expedition
Conference
Notes
IAM;ADAS
Approved
no
Call Number
IAM @ iam @ HGG2011
Serial
1546
Permanent link to this record
Author
Ole Larsen; Petia Radeva; Enric Marti
Title
Bounds on the optimal elasticity parameters for a snake
Type
Journal Article
Year
1995
Publication
Image Analysis and Processing
Abbreviated Journal
Volume
Issue
Pages
37-42
Keywords
Abstract
This paper develops a formalism by which an estimate for the upper and lower bounds for the elasticity parameters for a snake can be obtained. Objects different in size and shape give rise to different bounds. The bounds can be obtained based on an analysis of the shape of the object of interest. Experiments on synthetic images show a good correlation between the estimated behaviour of the snake and the one actually observed. Experiments on real X-ray images show that the parameters for optimal segmentation lie within the estimated bounds.
Address
Corporate Author
Thesis
Publisher
Place of Publication
Editor
Language
Summary Language
Original Title
Series Editor
Series Title
Abbreviated Series Title
Series Volume
Series Issue
Edition
ISSN
ISBN
Medium
Area
Expedition
Conference
Notes
MILAB;IAM
Approved
no
Call Number
IAM @ iam @ LRM1995a
Serial
1559
Permanent link to this record
Author
Josep Llados; Horst Bunke; Enric Marti
Title
Finding rotational symmetries by cyclic string matching
Type
Journal Article
Year
1997
Publication
Pattern recognition letters
Abbreviated Journal
PRL
Volume
18
Issue
14
Pages
1435-1442
Keywords
Rotational symmetry; Reflectional symmetry; String matching
Abstract
Symmetry is an important shape feature. In this paper, a simple and fast method to detect perfect and distorted rotational symmetries of 2D objects is described. The boundary of a shape is polygonally approximated and represented as a string. Rotational symmetries are found by cyclic string matching between two identical copies of the shape string. The set of minimum cost edit sequences that transform the shape string to a cyclically shifted version of itself define the rotational symmetry and its order. Finally, a modification of the algorithm is proposed to detect reflectional symmetries. Some experimental results are presented to show the reliability of the proposed algorithm
Address
Corporate Author
Thesis
Publisher
Elsevier
Place of Publication
Editor
Language
Summary Language
Original Title
Series Editor
Series Title
Abbreviated Series Title
Series Volume
Series Issue
Edition
ISSN
ISBN
Medium
Area
Expedition
Conference
Notes
DAG;IAM;
Approved
no
Call Number
IAM @ iam @ LBM1997a
Serial
1562
Permanent link to this record
Author
Josep Llados; Enric Marti
Title
A graph-edit algorithm for hand-drawn graphical document recognition and their automatic introduction into CAD systems
Type
Journal Article
Year
1999
Publication
Machine Graphics & Vision
Abbreviated Journal
Volume
8
Issue
Pages
195-211
Keywords
Abstract
Address
Corporate Author
Thesis
Publisher
Place of Publication
Editor
Language
Summary Language
Original Title
Series Editor
Series Title
Abbreviated Series Title
Series Volume
Series Issue
Edition
ISSN
ISBN
Medium
Area
Expedition
Conference
Notes
DAG;IAM;
Approved
no
Call Number
IAM @ iam @ LIM1999
Serial
1568
Permanent link to this record
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