The impact of acquisition angle differences on three-dimensional quantitative coronary angiography

Area of Science:

• Cardiology
• Medical Imaging
• Biomedical Engineering

Background:

• Three-dimensional quantitative coronary angiography (3D QCA) is crucial for assessing coronary vessel dimensions.
• This technique typically requires two angiographic views to reconstruct vessel geometry.
• The impact of the angle difference between these views on dimensional accuracy is not fully understood.

Purpose of the Study:

• To investigate the influence of acquisition angle differences (AADs) between two angiographic views on the accuracy of 3D QCA measurements.
• To evaluate the correlation between AAD and the precision of lesion and bifurcation assessments.

Main Methods:

• Brass and silicone phantoms with simulated coronary lesions and bifurcations were used.
• Angiograms were acquired at various projections and paired with AADs greater than 25°.
• 3D QCA was performed to measure lesion dimensions (length, diameter stenosis) and bifurcation parameters (angles, core volume).

Main Results:

• 3D QCA slightly overestimated diameter stenosis for all lesion types, with significant correlation to AAD only for severe concentric lesions.
• Lesion length overestimation was observed for one lesion type, but AAD correlation was not significant.
• Bifurcation angles were slightly overestimated, with the distal angle showing significant correlation with AAD; bifurcation core volume assessment was not affected by AAD.

Conclusions:

• 3D QCA provides reliable measurements of coronary vessel dimensions and bifurcation angles.
• Increasing the AAD does not enhance the accuracy or precision of 3D QCA for circular lesions or bifurcation dimensions.