Lawrence L. Creswell

University of Mississippi

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Michael K. Pasque

Washington University in St. Louis

Michael J. Moulton

University of Nebraska Medical Center

Hannah Copeland

Community Health Network

Michael W. Vannier

University of Chicago

James L. Cox

Northwestern Medicine

Michael Rosenbloom

HealthPartners

Stephen W. Downing

Mercy Hospital

Barna Szabó

Washington University in St. Louis

Ricardo L. Actis

Engineering Software Research and Development (United States)

Seth T. Lirette

University of Mississippi Medical Center

Cooperative Institutions

NorthEast Regional Epilepsy Group

185

Society of Thoracic Surgeons

158

Harvard University

Cleveland Clinic

Washington University in St. Louis

University of Toronto

Johns Hopkins University

University of Pennsylvania

Emory University

University of Michigan–Ann Arbor

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Potential ablation of accessory atrioventricular pathways: Injection of alcohol into the atrioventricular groove

The Annals of Thoracic Surgery (1994)

Lawrence L. Creswell Michael Rosenbloom John S. Pirolo Jeffrey E. Saffitz James L. Cox

Circumflex

Coronary arteries

Groove (engineering)

10.1016/0003-4975(94)90397-2

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Citations (4)

Coronary artery disease in patients with type A aortic dissection

The Annals of Thoracic Surgery (1995)

Lawrence L. Creswell Nicholas T. Kouchoukos James L. Cox Michael Rosenbloom

10.1016/0003-4975(94)00880-9

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Citations (79)

Spline surface interpolation for calculating 3-D ventricular strains from MRI tissue tagging

AJP Heart and Circulatory Physiology (1996)

Michael J. Moulton Lawrence L. Creswell Stephen W. Downing Ricardo L. Actis Barna Szabó

A method is developed and validated for approximating continuous smooth distributions of finite strains in the ventricles from the deformations of magnetic resonance imaging (MRI) tissue tagging "tag lines" or "tag surfaces." Tag lines and intersections of orthogonal tag lines are determined using a semiautomated algorithm. Three-dimensional (3-D) reconstruction of the displacement field on tag surfaces is performed using two orthogonal sets of MRI images and employing spline surface interpolation. The 3-D regional ventricular wall strains are computed from an initial reference image to a deformed image in diastole or systole by defining a mapping or transformation of space between the two states. The resultant mapping is termed the measurement analysis solution and is defined by determining a set of coefficients for the approximating functions that best fit the measured tag surface displacements. Validation of the method is performed by simulating tag line or surface deformations with a finite element (FE) elasticity solution of the heart and incorporating the measured root-mean-square (rms) errors of tag line detection into the simulations. The FE-computed strains are compared with strains calculated by the proposed procedure. The average difference between two-dimensional (2-D) FE-computed strains and strains calculated by the measurement analysis was 0.022 +/- 0.009 or 14.2 +/- 3.6% of the average FE elasticity strain solution. The 3-D displacement reconstruction errors averaged 0.087 +/- 0.002 mm or 2.4 +/- 0.1% of the average FE solution, and 3-D strain fitting errors averaged 0.024 +/- 0.011 or 15.9 +/- 2.8% of the average 3-D FE elasticity solution. When the rms errors in tag line detection were included in the 2-D simulations, the agreement between FE solution and fitted solution was 24.7% for the 2-D simulations and 19.2% for the 3-D simulations. We conclude that the 3-D displacements of MRI tag lines may be reconstructed accurately; however, the strain solution magnifies the small errors in locating tag lines and reconstructing 3-D displacements.

Interpolation

Spline (mechanical)

Contour line

Root mean square

B-spline

Elasticity

Displacement mapping

10.1152/ajpheart.1996.270.1.h281

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Citations (64)

Myocardial contractile state in dogs with chronic mitral regurgitation: Echocardiographic approach to the peak systolic pressure/end-systolic area relationship

American Heart Journal (1993)