Ultrasmall supraparamagnetic iron oxide-enhanced magnetic resonance imaging of antigen-induced arthritis: a comparative study between SHU 555 C, ferumoxtran-10, and ferumoxytol

Invest Radiol. 2006 Jan;41(1):45-51. doi: 10.1097/01.rli.0000191367.61306.83.


Objectives: We sought to compare the ability of 3 ultrasmall superparamagnetic iron oxides (USPIOs) to detect and characterize antigen-induced arthritis with MR imaging.

Materials and methods: A monoarthritis was induced in the right knee of 18 rats. The left knee served as a normal control. Knees underwent magnetic resonance (MR) imaging before, up to 2 hours, and 24 hours after injection (p.i.) of 200 mumol Fe/kg SHU 555 C (n= 6), ferumoxtran-10 (n = 6), or ferumoxytol (n = 6), using T2-2D-SE 100/20,40,60,80/90 (TR/TE/flipangle), T2*-3D-spoiled gradient recalled (SPGR) 100/15/38, and T1-3D-SPGR 50/1,7/60 sequences.

Results: Quantitative signal to noise ratio and DeltaSI data of arthritic knees on T1- and T2*-weighted MR images showed no significant differences between the 3 USPIOs (P > 0.05). At 2 hours p.i., SNR and DeltaSI data were significantly increased from baseline on T1-weighted images and significantly decreased on T2*-weighted images (P < 0.001). At 24 hours p.i., the T1-enhancement returned to baseline, whereas the T2*-enhancement remained significantly elevated (P < 0.001). Immunostains demonstrated an USPIO compartmentalization in macrophages in the arthritic synovium.

Conclusions: Based on the relatively small number of animals in our study group, inflammation in antigen-induced arthritis can be equally detected and characterized with any of the three USPIOs evaluated.

Publication types

  • Comparative Study
  • Research Support, Non-U.S. Gov't

MeSH terms

  • Animals
  • Contrast Media
  • Dextrans
  • Female
  • Ferrosoferric Oxide*
  • Image Processing, Computer-Assisted
  • Iron*
  • Magnetic Resonance Imaging / methods*
  • Magnetite Nanoparticles
  • Osteoarthritis, Knee / diagnosis*
  • Osteoarthritis, Knee / immunology
  • Oxides*
  • Rats
  • Rats, Sprague-Dawley
  • Serum Albumin, Bovine
  • Suspensions


  • Contrast Media
  • Dextrans
  • Magnetite Nanoparticles
  • Oxides
  • Suspensions
  • ferumoxtran-10
  • Serum Albumin, Bovine
  • Iron
  • ferumoxides
  • Ferrosoferric Oxide