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Improved harmonic phase myocardial strain maps.

J P Kuijer¹, E Jansen, J T Marcus

¹Dept. of Clinical Physics & Informatics, Vrije Universiteit Medical Center, Amsterdam, The Netherlands. jpa.kuijer@vumc.nl

Magnetic Resonance in Medicine

|October 25, 2001

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The harmonic phase (HARP) technique offers automatic myocardial strain mapping. Comparing single-plane (SPAMM) and conventional (CSPAMM) methods, CSPAMM shows reduced artifacts and improved accuracy for clinical applications.

Area of Science:

Cardiovascular Imaging
Biomedical Engineering
Medical Physics

Background:

Magnetic resonance tagging is crucial for quantifying myocardial deformation.
Current postprocessing is time-consuming, limiting clinical adoption.
The harmonic phase (HARP) technique automates myocardial strain map calculation.

Purpose of the Study:

To compare the accuracy and performance of HARP strain maps derived from single-plane tagged images (SPAMM) versus conventional subtracted tagged images (CSPAMM).
To evaluate the robustness of both methods against image noise and artifacts.

Main Methods:

Quantitative comparison using simulated cardiac images of an incompressible cylinder.
Assessment of the second principal stretch ratio error under varying contrast-to-noise ratios.

Related Experiment Videos

Qualitative evaluation of in vivo strain maps generated by SPAMM and CSPAMM techniques.

Main Results:

CSPAMM demonstrated a lower mean error (0.007 +/- 0.016) in the second principal stretch ratio compared to SPAMM (0.009 +/- 0.032) at identical image quality.
CSPAMM-derived strain maps exhibited fewer artifacts and reduced sensitivity to filter cut-off frequencies.
In vivo analysis confirmed CSPAMM's superiority in image quality and artifact reduction.

Conclusions:

The CSPAMM technique provides more accurate and artifact-reduced myocardial strain quantification compared to SPAMM.
CSPAMM is less sensitive to parameter variations, enhancing its reliability.
Acquisition within a single breathhold is essential for CSPAMM's clinical practicality.