MR Multitasking-based multi-dimensional assessment of cardiovascular system (MT-MACS) with extended spatial coverage...

Area of Science:

• Cardiovascular Imaging
• Magnetic Resonance Imaging
• Medical Physics

Background:

• Cardiovascular assessment relies on accurate imaging of the heart and aorta.
• Current MR techniques may have limitations in spatial coverage and simultaneous water-fat separation.
• The Multidimensional Assessment of Cardiovascular System (MT-MACS) technique offers a framework for advanced cardiovascular MRI.

Purpose of the Study:

• To enhance the MT-MACS technique for expanded spatial coverage and integrated water-fat separation.
• To enable comprehensive assessment of the aortocardiac system using a refined 7D MRI approach.

Main Methods:

• A low-rank tensor image model was employed for 7D MT-MACS imaging.
• The technique incorporated spatial, cardiac, respiratory, T2-prepared, and T2*-decay dimensions.
• Image quality, interreader agreement, myocardial wall thickness, and left ventricular ejection fraction (LVEF) were evaluated in nine healthy subjects.

Main Results:

• MT-MACS achieved excellent image quality for bright-blood, dark-blood, gray-blood, and fat-only images.
• High interreader agreement was observed across all contrasts and for water-fat separation.
• Measurements of myocardial wall thickness and LVEF showed good to excellent agreement with conventional 2D sequences.

Conclusions:

• The refined MT-MACS technique provides robust multi-contrast, phase-resolved, and water-fat imaging of the aortocardiac system.
• This advanced MRI method facilitates comprehensive evaluation of cardiovascular anatomy and function.
• Further clinical validation is recommended for this promising cardiovascular imaging technique.