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Fast tracking of cardiac motion using 3D-HARP
Li Pan1, Jerry L Prince, João A C Lima
1Department of Biomedical Engineering, Johns Hopkins School of Medicine, 601 N. Caroline St. JHOC 4240, Baltimore, MD 21287, USA. lipan@bme.jhu.edu
IEEE Transactions on Bio-Medical Engineering
|August 27, 2005
Summary
A new 3D-HARP method enables fast, semiautomatic tracking of 3D cardiac motion from tagged MR images. This approach significantly reduces postprocessing time for quantifying myocardial function, improving clinical applicability.
Area of Science:
- Biomedical Engineering
- Cardiovascular Imaging
- Medical Physics
Background:
- Magnetic resonance (MR) tagging allows noninvasive quantification of regional myocardial function.
- Current postprocessing methods are time-consuming, limiting routine clinical use.
Purpose of the Study:
- To develop a fast, semiautomatic method for tracking 3D cardiac motion using tagged MR images.
- To extend the 2D HARP approach to 3D for improved myocardial function analysis.
Main Methods:
- Proposed 3D-HARmonic Phase (3D-HARP) method utilizes a 3D material mesh model of the left ventricle (LV) wall.
- Time-invariant harmonic phase tracks mesh motion throughout the cardiac cycle.
- Calculates myocardial functional properties like circumferential strain and LV twist.
Main Results:
- 3D-HARP demonstrated strong correlation with established techniques (FINDTAGS + TEA) for circumferential strain (r2=0.8605) and twist angle (r2=0.8645).
- The method requires approximately 10 minutes for 3D cardiac motion tracking in a 9-frame tagged MRI dataset.
- Potential for further speed improvements in postprocessing.
Conclusions:
- 3D-HARP offers a significantly faster and semiautomatic approach to 3D cardiac motion analysis from tagged MR images.
- This method has the potential to overcome current limitations and facilitate routine clinical application of MR tagging for myocardial function assessment.