T2 quantification for improved detection of myocardial edema

Area of Science:

• Cardiovascular Imaging
• Medical Physics

Background:

• T2-weighted (T2W) MRI is used for detecting myocardial edema in acute myocardial infarction (AMI).
• T2W imaging faces challenges including signal variability, blood signal interference, motion artifacts, and subjective interpretation.
• Quantitative T2 mapping offers a more reliable alternative to qualitative T2W imaging.

Purpose of the Study:

• To demonstrate the advantages of quantitative T2 mapping for detecting myocardial edema.
• To overcome the limitations of conventional T2W imaging in assessing acute myocardial infarction.

Main Methods:

• T2 mapping protocols were evaluated on phantoms and optimized for in vivo imaging.
• The optimized protocol assessed variability and motion sensitivity in healthy subjects.
• T2 mapping utility was demonstrated in a porcine model and human patients with AMI.

Main Results:

• T2-prepared SSFP showed higher accuracy than multi-echo turbo spin echo for T2 estimation.
• Myocardial T2 in healthy subjects was 52.18 ± 3.4 ms, independent of heart rate.
• T2 maps were insensitive to phased array coil variations and cardiac motion, unlike T2W images.
• Infarcted regions in pigs and patients with AMI exhibited significantly higher T2 values.

Conclusions:

• Quantitative T2 mapping effectively addresses limitations of T2W cardiac imaging.
• This technique provides enhanced accuracy for detecting myocardial edema and diagnosing AMI.