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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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Accelerating cine-MR imaging in mouse hearts using compressed sensing.

Tobias Wech¹, Angela Lemke, Debra Medway

¹Institute of Radiology, University of Würzburg, Würzburg, Germany.

Journal of Magnetic Resonance Imaging : JMRI

|September 21, 2011

Summary

Compressed sensing (CS) significantly reduces cardiac MRI scan times in mice without compromising accuracy. This validated technique accelerates experimental imaging without requiring costly hardware upgrades.

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Area of Science:

Cardiovascular Imaging
Biomedical Engineering
Magnetic Resonance Imaging

Background:

Accelerating cardiac magnetic resonance imaging (MRI) is crucial for experimental studies.
Compressed sensing (CS) offers a promising approach to reduce MRI acquisition times.

Purpose of the Study:

To combine global cardiac function imaging with compressed sensing (CS) to reduce scan time.
To validate CS technique in normal mouse hearts and a murine model of chronic myocardial infarction.

Main Methods:

Retrospective undersampling (2-4 fold) of cine MRI data in sham and infarcted mouse hearts.
Prospective implementation of CS sampling schemes on a 9.4 T MRI system for normal mouse hearts.
Image segmentation and analysis of cardiac functional parameters.

Main Results:

An undersampling factor of three was feasible without impairing accuracy of cardiac functional parameters.
Prospective CS acquisition yielded comparable left-ventricular functional parameters.
Low intra- and interobserver variability was observed between fully and 3-fold undersampled data.

Conclusions:

CS provides a validated method to accelerate experimental cine-MRI.
This technique enhances efficiency without necessitating expensive hardware.