Journal
MAGNETIC RESONANCE IN MEDICINE
Volume 56, Issue 6, Pages 1384-1388Publisher
JOHN WILEY & SONS INC
DOI: 10.1002/mrm.21093
Keywords
MRI; contrast agent; nanoparticle; fibrin; molecular imaging
Funding
- NHLBI NIH HHS [R01 HL042950-09, R01 HL059865, R01 HL059865-02, R01 HL042950] Funding Source: Medline
- NIBIB NIH HHS [R01 EB001704, R01 EB001704-01, R01 EB001704-02, R01 EB001704-03] Funding Source: Medline
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A lipid-encapsulated perfluorocarbon nanoparticle molecular imaging contrast agent that utilizes a paramagnetic chemical exchange saturation transfer (PARACEST) chelate is presented. PARACEST agents are ideally suited for molecular imaging applications because one can switch the contrast on and off at will simply by adjusting the pulse sequence parameters. This obviates the need for pre- and postinjection images to define contrast agent binding. Spectroscopy (4.7T) of PARACEST nanoparticles revealed a bound water peak at 52 ppm, in agreement with results from the water-soluble chelate. Imaging of control nanoparticles showed no appreciable contrast, while PARACEST nanoparticles produced > 10% signal enhancement. PARACEST nanoparticles were targeted to clots via antifibrin antibodies and produced a contrast-to-noise ratio (CNR) of 10 at the clot surface.
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