Interventricular differences in myocardial T2 measurements: experimental and clinical studies

Area of Science:

• Cardiovascular Imaging
• Biomedical Engineering
• Magnetic Resonance Imaging

Background:

• Myocardial T2 measurements are crucial for assessing tissue characteristics.
• Understanding T2 value determinants is essential for accurate interpretation.
• Previous studies have explored T2 in myocardium with varying methodologies.

Purpose of the Study:

• To evaluate the accuracy and reproducibility of image-based myocardial T2 measurements.
• To identify tissue determinants influencing T2 values in the myocardium.
• To compare T2 values between the right ventricle (RV) and left ventricle (LV) free walls.

Main Methods:

• Ex vivo hog hearts analyzed for in vitro T2, water, fat, and collagen content.
• Image-based T2 measurements performed on hog hearts and 14 healthy human subjects.
• Spin-echo imaging used for T2 determination in human subjects.
• Reproducibility assessed through multiple image acquisitions from a single subject.

Main Results:

• In hog hearts, RV T2 was significantly longer than LV T2, both in vitro and image-based.
• Myocardial water content significantly correlated with T2 values.
• Human subjects showed significant LV-RV T2 differences with first- and third-echo images.
• Image-based T2 measurements demonstrated good reproducibility (CV 6.8% for LV, 9.1% for RV).

Conclusions:

• Image-based T2 measurements offer sufficient precision to detect inter-ventricular differences in normal myocardium.
• Water content is a significant determinant of myocardial T2 values.
• These findings suggest image-based T2 can provide valuable data for patient treatment.