Gated magnetic resonance imaging of the normal and diseased heart

Area of Science:

• Cardiovascular Imaging
• Medical Diagnostics
• Radiology

Background:

• Cardiac magnetic resonance (MR) imaging is a key tool for cardiovascular assessment.
• Optimizing image acquisition techniques is crucial for accurate diagnosis.

Purpose of the Study:

• To evaluate the diagnostic utility of gated cardiac MR imaging.
• To compare image quality between gated and nongated techniques, and between cardiac-gated and combined cardiac-respiratory-gated imaging.

Main Methods:

• Gated cardiac MR imaging was performed on 23 subjects (2 volunteers, 21 with cardiovascular abnormalities).
• Images were correlated with clinical data, ECGs, and cardiac catheterization.
• Acquisition techniques included cardiac gating and combined cardiac-respiratory gating.

Main Results:

• Gated cardiac MR images were superior to nongated images.
• Combined cardiac and respiratory gating yielded better results than cardiac gating alone, albeit with longer acquisition times.
• Coronary arteries were visualized in 30% of cases; myocardial infarcts were detected in 55% of relevant patients.
• Normal cardiac anatomy was well visualized; coronary atherosclerosis and signal changes in subacute infarcts/myocarditis were not observed.

Conclusions:

• Gated cardiac MR imaging enhances visualization of cardiac anatomy and pathology.
• Combined gating improves image quality but necessitates longer scan durations.
• The technique shows potential for diagnosing myocardial infarcts and assessing cardiac structures, though coronary artery visualization remains limited.