Diffusion-weighted echo planar imaging in patients with recent myocardial infarction

Area of Science:

• Cardiovascular Imaging
• Magnetic Resonance Imaging
• Myocardial Infarction Research

Background:

• Assessing myocardial signal abnormalities is crucial for diagnosing recent myocardial infarction (MI).
• Standard T2-weighted sequences may not always accurately detect these abnormalities.
• Diffusion-weighted (DW) black blood magnetic resonance (MR) imaging offers potential for improved detection.

Purpose of the Study:

• To evaluate the efficacy of a DW black blood MR sequence in identifying myocardial signal abnormalities in patients with recent MI.
• To compare the performance of DW black blood MR sequences against standard T2-weighted sequences.

Main Methods:

• A 1.5 T DW black blood EPI sequence was used in 12 recent MI patients.
• Standard STIR T2-weighted sequences were acquired for comparison.
• Myocardial viability was assessed using delayed-enhancement sequences; images were analyzed qualitatively and quantitatively.

Main Results:

• DW EPI sequences demonstrated superior blood suppression compared to STIR T2-weighted sequences (P=0.01).
• Myocardial high signal areas were detected in 100% of patients using DW EPI versus 67% with STIR T2-weighted imaging.
• DW EPI correctly identified abnormalities in four patients with false-negative STIR T2 findings.

Conclusions:

• DW EPI sequences are a feasible and effective alternative for detecting myocardial signal abnormalities in recent MI.
• This technique shows promise for improving the diagnostic accuracy of MI assessment.