Two-dimensional strain imaging of controlled rabbit hearts.
Congxian Jia1, Ragnar Olafsson, Kang Kim
1Department of Biomedical Engineering, University of Michigan, Ann Arbor, 48109-2099, USA. cxjia@umich.edu
Ultrasound in Medicine & Biology
|July 21, 2009
Summary
Ultrasound strain imaging can assess heart muscle contractility changes during ischemia. Dual-probe methods improve accuracy over single-probe techniques, crucial for clinical applications.
Area of Science:
- Cardiovascular imaging
- Biomedical engineering
- Medical diagnostics
Background:
- Myocardial contractility changes due to ischemia are difficult to quantify.
- Ultrasound strain imaging offers a potential method for quantitative assessment.
- Controlled studies are needed to validate its clinical applicability.
Purpose of the Study:
- To develop and validate a 2-D cardiac elasticity imaging technique.
- To assess myocardial contractility changes in an isolated heart model.
- To compare single-probe and dual-probe ultrasound strain imaging accuracy.
Main Methods:
- Utilized two coplanar and orthogonal linear probes for simultaneous imaging of an isolated rabbit heart.
- Induced acute ischemia via left anterior descending artery ligation.
- Employed 2,3-butanedione monoxime to reversibly alter myocardial contractility.
Main Results:
- Single-probe analysis identified bulging areas due to ischemia and characterized contractility using strain magnitude.
- Dual-probe measurements validated single-probe findings, demonstrating improved accuracy.
- Accuracy of single-probe imaging was found to be orientation-dependent due to lateral displacement estimation variance.
Conclusions:
- 2-D ultrasound strain imaging can quantitatively assess myocardial contractility during ischemia.
- Dual-probe techniques enhance the accuracy of strain measurements compared to single-probe methods.
- Further refinement is needed for reliable clinical application of single-probe ultrasound strain imaging.
