[Quantitative coronary angiography: methodologic principles of a densitometric procedure].

Area of Science:

• Cardiovascular imaging
• Medical physics
• Interventional cardiology

Background:

• Coronary artery stenosis assessment is crucial for cardiovascular disease management.
• Accurate measurement of stenosis cross-sectional area is vital for treatment decisions.
• Current methods may be complex or require extensive equipment.

Purpose of the Study:

• To investigate the feasibility of using light intensity measurement for densitometric analysis of coronary stenosis.
• To correlate light intensity with contrast medium volume and cross-sectional area in coronary arteries.
• To evaluate this method's potential as a simpler alternative to existing techniques.

Main Methods:

• Measuring light intensity through coronary angiographic frames using a light sensor.
• Correlating light intensity with contrast medium amount in phantom studies.
• Assessing correlation between real and densitometrically measured cross-sectional areas in concentric and eccentric stenosis models.

Main Results:

• Light intensity showed a strong positive correlation with contrast medium amount (r = 0.96-0.99) in phantom studies, even with diluted contrast.
• A good correlation (r = 0.97) was found between real and densitometrically measured cross-sectional areas in concentric stenosis models.
• Linear correlation (r = 0.96) was observed even in eccentric stenosis models.

Conclusions:

• Densitometric measurement of coronary stenosis cross-section relative to normal segments appears feasible using light intensity.
• This method offers a potentially simpler and less equipment-intensive approach compared to video densitometry.
• Further validation may lead to a valuable tool for coronary stenosis assessment.