An approach to the three-dimensional display of left ventricular function and viability using MRI

Area of Science:

• Cardiovascular Imaging
• Medical Physics
• Biomedical Engineering

Background:

• Cardiac MRI is crucial for assessing left ventricular (LV) anatomy and function.
• Variability in diaphragm position during breath-holds causes misregistration (MSR) in cardiac MRI.
• Accurate anatomical modeling is essential for integrating functional data.

Purpose of the Study:

• To quantify the misregistration (MSR) of cardiac landmarks due to diaphragm position variability.
• To develop and validate a method for correcting MSR in cardiac MRI.
• To enable high-resolution 3D reconstruction and functional mapping of the LV.

Main Methods:

• Cardiac MRI was performed on seven healthy volunteers to assess endocardial centroid MSR.
• A second-order polynomial fit was used to minimize in-plane MSR.
• Short-axis cine images were corrected for MSR to generate an accurate LV anatomical model.
• Parametric maps of myocardial perfusion and viability were registered to the 3D LV model.

Main Results:

• The mean MSR was 3.01 ± 1.68 mm through-plane and 4.16 ± 1.62 mm in-plane.
• The polynomial fit effectively minimized the in-plane MSR.
• High-resolution 2D data allowed for accurate 3D LV anatomical model generation.
• The technique was applied to three cardiovascular disease patients for regional analysis.

Conclusions:

• A 3D reconstruction technique effectively corrects for MSR in cardiac MRI.
• This method allows for accurate 3D visualization of LV anatomy.
• Parametric mapping of myocardial perfusion and viability can be integrated with the 3D model for comprehensive functional assessment.