Left ventricle evaluation by digital video subtraction angiocardiography

Area of Science:

• Cardiovascular Imaging
• Diagnostic Radiology
• Medical Physics

Background:

• Assessing left ventricular function is crucial in cardiology.
• Digital video subtraction angiocardiography (DVSA) offers potential for non-invasive cardiac imaging.
• Time-interval difference (TID) mode is a specific technique within DVSA.

Purpose of the Study:

• To evaluate the accuracy of DVSA in TID mode for measuring left ventricular ejection fraction and wall motion.
• To compare DVSA TID mode measurements with conventional left ventriculography.

Main Methods:

• Twenty patients with high-quality DVSA TID examinations were selected from 70 cases.
• Intravenous contrast material was administered.
• Conventional left ventriculography was performed for comparison.
• Images were acquired using a prototype digital vascular imaging unit.

Main Results:

• DVSA TID mode showed good correlation with conventional left ventriculography for ejection fraction (r=0.81).
• Excellent correlation was observed for anterior wall and apex motion (r=0.89).
• Correlation for inferior ventricular wall motion was lower (r=0.62) due to visualization challenges.

Conclusions:

• DVSA in TID mode is a reliable method for assessing left ventricular ejection fraction and anterior wall motion.
• The technique shows promise but requires further refinement for accurate inferior wall motion analysis.
• Image quality and anatomical interference (left hemidiaphragm) impact diagnostic accuracy.