Interactive virtual probing of 4D MRI blood-flow

Area of Science:

• Cardiovascular imaging
• Medical physics
• Computational fluid dynamics

Background:

• Understanding hemodynamics is crucial for diagnosing and predicting cardiovascular diseases.
• Four-dimensional (4D) magnetic resonance imaging (MRI) provides quantitative, time-resolved blood flow data.
• Accurate anatomical segmentation is a bottleneck for analyzing complex blood flow patterns.

Purpose of the Study:

• To develop a method for qualitative inspection of 4D blood flow MRI data without laborious segmentation.
• To introduce an interactive virtual probe for semi-automatic positioning and navigation within blood flow fields.
• To enhance the visual exploration of unsteady blood flow characteristics.

Main Methods:

• Development of an interactive virtual probe for semi-automatic positioning in 4D velocity fields.
• Automated alignment of the probe with velocity field orientations using a fitting approach.
• Integration of the probe with various flow visualization techniques, including particles, integral lines, and surfaces.

Main Results:

• The virtual probe facilitates qualitative inspection of blood flow, avoiding time-consuming segmentation.
• The probe's alignment method automates position and orientation determination.
• Demonstrated visualization of unsteady blood flow characteristics using illustration-inspired particles, integral lines, and surfaces.

Conclusions:

• The interactive virtual probe offers a practical solution for qualitative analysis of 4D cardiovascular blood flow MRI.
• The developed techniques improve the efficiency and accessibility of blood flow visualization.
• Domain expert evaluation confirmed the practical utility of the probe and visualization methods.