In Vivo Fluorine Imaging Using 1.5 Tesla MRI for Depiction of Experimental Myocarditis in a Rodent Animal Model

Area of Science:

• Biomedical Imaging
• Cardiovascular Research
• Nanotechnology

Background:

• Experimental myocarditis is a significant cardiovascular condition requiring effective diagnostic tools.
• Perfluorocarbon nanoemulsions have shown potential for medical imaging.
• Previous studies demonstrated effectiveness at high magnetic field strengths (9.4T).

Purpose of the Study:

• To evaluate the feasibility of using perfluorocarbon nanoemulsions with ¹⁹F/¹H MRI for imaging experimental myocarditis at a clinically relevant 1.5 Tesla field strength.
• To correlate MRI findings with histological data of myocardial inflammation.

Main Methods:

• Experimental myocarditis was induced in rats using doxorubicin over six weeks.
• Animals received an injection of perfluorooctylbromide nanoemulsion prior to ¹H/¹⁹F MRI at 1.5T.
• Cardiac histology and immunohistochemistry (CD68/ED1) were performed post-imaging.

Main Results:

• ¹⁹F MRI detected specific signals in the myocardium of doxorubicin-treated rats, absent in controls.
• The doxorubicin group exhibited significantly higher signal-to-noise ratio (SNR) for ¹⁹F MRI.
• Increased CD68/ED1 macrophage staining correlated with ¹⁹F MRI signal intensity.

Conclusions:

• Perfluorocarbon nanoemulsions are detectable in vivo in an experimental myocarditis model at 1.5 Tesla MRI.
• This approach offers a potential non-invasive imaging method for diagnosing myocarditis at clinical field strengths.
• ¹⁹F/¹H MRI with nanoemulsions shows promise for future clinical translation in cardiovascular imaging.