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Magn Reson Med. 2006 Dec;56(6):1384-8.

Targeted PARACEST nanoparticle contrast agent for the detection of fibrin.

Author information

  • 1Department of Medicine, Cardiovascular Division, Washington University, St. Louis, Missouri 63108, USA. patrick@cvu.wustl.edu

Abstract

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.

PMID:
17089356
[PubMed - indexed for MEDLINE]
PMCID:
PMC2920499
Free PMC Article
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