Toward quantitative X-ray elastography of coronary arteries using flexural pulse waves

Area of Science:

• Biomedical Engineering
• Medical Imaging
• Cardiovascular Research

Background:

• Dynamic elastography visualizes elastic wave propagation, but X-ray elastography faces challenges due to slow sampling rates.
• Arterial elasticity is a key biomarker for cardiovascular health, traditionally assessed through palpation.
• Flexural pulse waves, generated by heartbeats and propagating in arteries, present a unique opportunity for X-ray elastography.

Purpose of the Study:

• To demonstrate the feasibility of X-ray elastography for measuring arterial elasticity.
• To validate a novel method using naturally occurring flexural pulse waves for X-ray elastography.
• To assess arterial elasticity in vivo using routine coronary angiography.

Main Methods:

• Tracking slow elastic waves (flexural pulse waves) along a one-dimensional arterial structure using X-ray imaging.
• Validating the X-ray elastography method with artery phantoms.
• Applying the technique to in vivo coronary artery data obtained during angiography.

Main Results:

• Successful measurement of elasticity in artery phantoms using X-ray elastography.
• Preliminary in vivo measurements of Young's moduli in human coronary arteries (E = 38 ± 30 kPa and E = 38 ± 28 kPa).
• Demonstrated the potential of using natural pulse waves for X-ray elastography.

Conclusions:

• Tracking slow elastic waves, specifically flexural pulse waves, offers a viable solution for X-ray elastography.
• This technique paves the way for non-invasive assessment of arterial elasticity using existing angiography procedures.
• X-ray elastography holds promise for routine cardiovascular health monitoring.