Analytical method to measure three-dimensional strain patterns in the left ventricle from single slice displacement...

Area of Science:

• Cardiovascular Magnetic Resonance (CMR)
• Biomedical Engineering
• Medical Imaging Analysis

Background:

• Displacement encoded CMR provides high-resolution 3D Lagrangian displacement measurements.
• Calculating regional myocardial strain typically requires adjacent slices for through-slice gradient analysis, increasing scan time.
• Current methods necessitate additional data acquisition, prolonging cardiovascular MR scans.

Purpose of the Study:

• To develop an analytical solution for reconstructing out-of-plane Lagrangian strain tensor components from single-slice CMR data.
• To enable high spatio-temporal resolution strain calculation using a single-slice displacement dataset.
• To leverage the physical constraint of myocardial incompressibility for strain tensor reconstruction.

Main Methods:

• Developed an analytical solution to reconstruct out-of-plane strain components.
• Utilized a single-slice displacement Cardiovascular MR dataset.
• Assumed myocardial incompressibility as a physical constraint for the model.

Main Results:

• Demonstrated the feasibility of the method in a healthy human subject.
• Validated the technique with simulated data and experimentally measured DENSE data.
• Compared strain estimates with conventional two-slice acquisition methods.

Conclusions:

• The analytical method reduces the necessity of acquiring data from adjacent slices for regional Lagrangian strain calculations.
• This approach effectively reduces cardiovascular MR scan time by a factor of two.
• Enables accurate strain calculation with reduced data acquisition.