Targeted PARACEST nanoparticle contrast agent for the detection of fibrin

Patrick M. Winter, Kejia Cai, Junjie Chen, Christopher R. Adair, Garry E. Kiefer, Phillip S. Athey, Patrick J. Gaffney, Carolyn E. Buff, J. David Robertson, Shelton D. Caruthers, Samuel A. Wickline, Gregory M. Lanza

Research output: Contribution to journalArticlepeer-review

84 Scopus citations


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.

Original languageEnglish
Pages (from-to)1384-1388
Number of pages5
JournalMagnetic resonance in medicine
Issue number6
StatePublished - Dec 2006


  • Contrast agent
  • Fibrin
  • MRI
  • Molecular imaging
  • Nanoparticle


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