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Quantification of Mouse Heart Left Ventricular Function, Myocardial Strain, and Hemodynamic Forces by Cardiovascular Magnetic Resonance Imaging

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Accurate two-dimensional cardiac strain calculation using adaptive windowed Fourier transform and Gabor wavelet

Y B Fu¹, C K Chui, C L Teo

¹Department of Mechanical Engineering, National University of Singapore, Singapore, Singapore. g0800248@nus.edu.sg

International Journal of Computer Assisted Radiology and Surgery

|April 25, 2012

Summary

A new adaptive windowed harmonic phase (AWHARP) method accurately calculates cardiac strain from MR images. This efficient technique improves detection of heart abnormalities like hypertrophic cardiomyopathy.

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Area of Science:

Cardiovascular Imaging
Biomedical Engineering
Medical Physics

Background:

Cardiac strain analysis from tagged MR images is crucial for identifying heart-wall motion abnormalities.
Efficient and accurate methods for cardiac strain calculation are needed for clinical applications.

Purpose of the Study:

To propose and evaluate an adaptive windowed harmonic phase (AWHARP) method for accurate and efficient cardiac strain calculation.
To compare AWHARP with the existing harmonic phase (HARP) method.

Main Methods:

AWHARP combines adaptive windowed Fourier transform (AWFT) and 2D Gabor wavelet transform (2D-GWT) for enhanced phase extraction.
Multi-resolution analysis is employed for precise phase extraction.
The method was validated using simulated and patient-derived tagged MR images (SPAMM and CSPAMM).

Main Results:

AWHARP demonstrated higher accuracy in phase and strain calculations compared to HARP, particularly with significant tag deformation.
Accuracy improvements reached up to 3.2 strain (E1).
Reduced end-systolic cardiac strain was observed in patients with hypertrophic cardiomyopathy (HCM).

Conclusions:

The AWHARP method provides an accurate and efficient approach for cardiac strain estimation from MR images.
This algorithm aids in the detection of left ventricle dysfunctions and myocardial diseases through precise cardiac strain analysis.