Automatic evaluation of vessel diameter variation from 2D X-ray angiography

Area of Science:

• Medical imaging analysis
• Cardiovascular diagnostics
• Biomechanical engineering

Background:

• Early detection of vascular pathologies is crucial for managing cardiovascular health.
• Arterial distensibility is a key indicator of arterial stiffness and overall vascular function.
• Current methods for assessing arterial distensibility can be labor-intensive and subjective.

Purpose of the Study:

• To develop and validate an automated method for calculating arterial distensibility from monoplane 2D X-ray sequences.
• To assess the feasibility of this method for both small (coronary) and large (aorta) arteries.
• To provide a tool for objective and efficient measurement of vascular function.

Main Methods:

• Artery segmentation using a graph-based approach.
• Spatio-temporal tracking of arterial segments with the Temporal Vessel Walker method.
• Automatic diameter measurement of the selected artery segment across cardiac cycles.

Main Results:

• The automated method achieved high accuracy on simulated data (98% Dice index, low MSE).
• Diameter measurements from patient angiograms showed consistency with expert manual assessments.
• The technique successfully computed arterial distensibility from 2D X-ray sequences of coronary arteries and the aorta.

Conclusions:

• The proposed automated method accurately measures arterial diameter changes from 2D X-ray sequences.
• This technique offers a potential key tool for physicians to detect arterial stiffness variations.
• It may aid in the early diagnosis of various vasculopathies associated with altered arterial stiffness.