Cardiovascular function and flow by 4-dimensional magnetic resonance imaging techniques: new applications

Area of Science:

• Cardiovascular Imaging
• Medical Physics
• Biomedical Engineering

Background:

• Four-dimensional (4D) flow magnetic resonance imaging (MRI) acquisition techniques have advanced significantly over 30 years.
• Accelerated acquisition has reduced scan times, making 4D flow MRI more clinically feasible and widely adopted in research.
• This progress has opened new avenues for evaluating cardiovascular flow patterns.

Purpose of the Study:

• To review the clinical applications of 4D flow MRI.
• To present novel visualization and quantification tools for cardiovascular blood flow analysis.
• To highlight the role of 4D flow MRI in understanding physiological and pathological flow dynamics.

Main Methods:

• Review of advancements in 4D flow MRI acquisition techniques, focusing on speed improvements.
• Description of visualization tools (e.g., vector glyphs, streamlines, pathlines) for displaying blood flow velocity.
• Explanation of quantification methods for hemodynamic markers derived from 4D flow data.

Main Results:

• Acquisition acceleration has led to clinically viable scan durations for 4D flow MRI.
• New applications have emerged for assessing diverse cardiovascular flow patterns.
• Visualization and quantification tools provide insights into temporal flow distribution and enable hemodynamic marker calculation.

Conclusions:

• Hemodynamic markers derived from 4D flow MRI are crucial for quantifying cardiovascular abnormalities.
• These markers aid in characterizing vascular and myocardial remodeling, potentially predicting conditions like heart failure, aortic dissection, aneurysm, or thrombus formation.
• 4D flow MRI, with its advanced tools, offers significant potential for clinical diagnosis and management of cardiovascular diseases.