[Myocardial perfusion imaging by digital subtraction angiography]

Area of Science:

• Cardiology
• Medical Imaging
• Diagnostic Techniques

Background:

• Assessing regional myocardial perfusion is crucial for diagnosing coronary artery disease.
• Digital subtraction angiography (DSA) is an imaging technique used in cardiology.
• Optimizing DSA protocols can improve the visualization of coronary blood flow.

Purpose of the Study:

• To compare different digital subtraction angiography (DSA) methods for enhanced visualization of regional myocardial perfusion.
• To determine the optimal cardiac cycle phases for mask and live film acquisition in coronary angiography.
• To evaluate the effectiveness of continuous image (CI) mode versus time interval difference (TID) mode in DSA for myocardial perfusion imaging.

Main Methods:

• Comparison of DSA techniques in patients with myocardial infarction, angina pectoris, and normal coronary arteries.
• Selection of mask and live films from specific cardiac cycle phases (R wave, 100 msec before R, 200 msec before R) to minimize cardiac motion.
• Application of CI mode and TID mode DSA for visualizing contrast medium perfusion.
• Analysis of subtracted images for density and contour line display.

Main Results:

• Acquiring mask and live films 100 or 200 msec before the R wave improved image similarity due to reduced cardiac motion.
• CI mode adequately visualized overall contrast medium perfusion from artery to vein.
• TID mode visualized contrast medium passage through arteries, capillaries, and veins at specific phases.
• DSA revealed non-uniform regional myocardial perfusion in normal subjects, influenced by coronary artery anatomy.

Conclusions:

• DSA methods, particularly TID mode, can effectively visualize regional myocardial perfusion.
• Optimal selection of cardiac cycle phases is critical for accurate DSA imaging.
• Coronary artery typography influences myocardial perfusion patterns even in healthy individuals.