title: Magnetic resonance enhancement pattern and diagnostic accuracy of gadofluorine M in a rabbit VX2 tumor model: Comparison with gadopentetate dimeglumine.
abstract: OBJECTIVE
  The purpose of this study was to evaluate the enhancement pattern and the diagnostic accuracy of gadofluorine M in comparison with gadopentetate dimeglumine in a rabbit VX2 tumor model.
  
  
  METHODS
  Thirteen rabbits with experimentally induced VX2 carcinomas in the thighs underwent sequential T1-weighted enhancement MR imaging using a 3.0T MR imager, first with gadopentetate dimeglumine, and then 24 (n=4) or 4h (n=9) later with gadofluorine M. In 4 rabbits with 13 tumors, the time-percentage enhancement (PE; i.e., percentage of signal intensity increase) curve was obtained for up to 24h for each contrast agent. In 9 rabbits with 49 tumors (random numbers of VX2 tumors were inoculated at random sites in the thigh), 3 readers unaware of the histopathologic results interpreted the MR images and determined the number and conspicuity level of the detected tumors. The reference standard was the histopathology of the specimen.
  
  
  RESULTS
  The time-to-peak PE for gadopentetate dimeglumine was 1min and gadopentetate dimeglumine showed a rapid washout pattern. The time-to-peak PE for gadofluorine M was 30min and gadofluorine M showed a plateau enhancement pattern for up to 24h. The peak PE of gadofluorine M was approximately twice that of the same dose of gadopentetate dimeglumine (108.2±14.8 vs. 51.5±24.0). The sensitivities for detecting VX2 tumors by 3 readers were 89.8% (44/49), 85.7% (42/49), and 95.9% (47/49) for gadopentetate dimeglumine-enhanced MR imaging, and 87.8% (43/49), 89.8% (44/49), and 89.8% (44/49) for gadofluorine M-enhanced MR imaging. No significant differences in the sensitivities existed between the two contrast agents for any reader. However, the conspicuity level of tumors was superior with gadofluorine M-enhanced MR imaging for two readers and similar for the other reader.
  
  
  CONCLUSIONS
  Gadofluorine M showed strong and plateau enhancement of tumors for up to 24h. In the reader study, gadofluorine M showed better conspicuity for VX2 tumors than gadopentetate dimeglumine, but had a similar sensitivity.
authors.affiliation: Department of Radiology, Seoul Metropolitan Government Seoul National University, Boramae Medical Center, Seoul, Republic of Korea.
authors.forename: Seung Ja
authors.initials: SJ
authors.lastname: Kim
authors.forename: Woo Kyung
authors.initials: WK
authors.lastname: Moon
authors.forename: Seung Hong
authors.initials: SH
authors.lastname: Choi
authors.forename: Jung Min
authors.initials: JM
authors.lastname: Chang
authors.forename: Nariya
authors.initials: N
authors.lastname: Cho
mesh_terms: D000818:Animals; D045744:Cell Line, Tumor; D003287:Contrast Media; D005466:Fluorocarbons; D019786:Gadolinium DTPA; D008279:Magnetic Resonance Imaging / Q000379:methods*; D009374:Neoplasms, Experimental / Q000473:pathology*; D009942:Organometallic Compounds; D011817:Rabbits; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity
chemical_list: D003287:Contrast Media; D005466:Fluorocarbons; D009942:Organometallic Compounds; C517961:gadofluorine M; D019786:Gadolinium DTPA