PURPOSE: To investigate the utility of inversion recovery with ON-resonant water suppression (IRON) to create positive signal in normal lymph nodes after injection of superparamagnetic nanoparticles. MATERIALS AND METHODS: Experiments were conducted on six rabbits, which received a single bolus injection of 80 mumol Fe/kg monocrystalline iron oxide nanoparticle (MION-47). Magnetic resonance imaging (MRI) was performed at baseline, 1 day, and 3 days after MION-47 injection using conventional T(1)- and T(2)*-weighted sequences and IRON. Contrast-to-noise ratios (CNR) were measured in blood and in paraaortic lymph nodes. RESULTS: On T(2)*-weighted images, as expected, signal attenuation was observed in areas of paraaortic lymph nodes after MION-47 injection. However, using IRON the paraaortic lymph nodes exhibited very high contrast enhancement, which remained 3 days after injection. CNR with IRON was 2.2 +/- 0.8 at baseline, increased markedly 1 day after injection (23.5 +/- 5.4, P < 0.01 vs. baseline), and remained high after 3 days (21.8 +/- 5.7, *P < 0.01 vs. baseline). CNR was also high in blood 1 day after injection (42.7 +/- 7.2 vs. 1.8 +/- 0.7 at baseline, P < 0.01) but approached baseline after 3 days (1.9 +/- 1.4, P = NS vs. baseline). CONCLUSION: IRON in conjunction with superparamagnetic nanoparticles can be used to perform 'positive contrast' MR-lymphography, particularly 3 days after injection of the contrast agent, when signal is no longer visible within blood vessels. The proposed method may have potential as an adjunct for nodal staging in cancer screening. (c) 2008 Wiley-Liss, Inc.
PURPOSE: To investigate the utility of inversion recovery with ON-resonant water suppression (IRON) to create positive signal in normal lymph nodes after injection of superparamagnetic nanoparticles. MATERIALS AND METHODS: Experiments were conducted on six rabbits, which received a single bolus injection of 80 mumol Fe/kg monocrystallineiron oxide nanoparticle (MION-47). Magnetic resonance imaging (MRI) was performed at baseline, 1 day, and 3 days after MION-47 injection using conventional T(1)- and T(2)*-weighted sequences and IRON. Contrast-to-noise ratios (CNR) were measured in blood and in paraaortic lymph nodes. RESULTS: On T(2)*-weighted images, as expected, signal attenuation was observed in areas of paraaortic lymph nodes after MION-47 injection. However, using IRON the paraaortic lymph nodes exhibited very high contrast enhancement, which remained 3 days after injection. CNR with IRON was 2.2 +/- 0.8 at baseline, increased markedly 1 day after injection (23.5 +/- 5.4, P < 0.01 vs. baseline), and remained high after 3 days (21.8 +/- 5.7, *P < 0.01 vs. baseline). CNR was also high in blood 1 day after injection (42.7 +/- 7.2 vs. 1.8 +/- 0.7 at baseline, P < 0.01) but approached baseline after 3 days (1.9 +/- 1.4, P = NS vs. baseline). CONCLUSION:IRON in conjunction with superparamagnetic nanoparticles can be used to perform 'positive contrast' MR-lymphography, particularly 3 days after injection of the contrast agent, when signal is no longer visible within blood vessels. The proposed method may have potential as an adjunct for nodal staging in cancer screening. (c) 2008 Wiley-Liss, Inc.
Authors: Matthias Stuber; Wesley D Gilson; Michael Schär; Dorota A Kedziorek; Lawrence V Hofmann; Saurabh Shah; Evert-Jan Vonken; Jeff W M Bulte; Dara L Kraitchman Journal: Magn Reson Med Date: 2007-11 Impact factor: 4.668
Authors: Dow-Mu Koh; Gina Brown; Louis Temple; Asraf Raja; Paul Toomey; Nicholas Bett; Andrew R Norman; Janet E Husband Journal: Radiology Date: 2004-02-19 Impact factor: 11.105
Authors: Mukesh G Harisinghani; Jelle Barentsz; Peter F Hahn; Willem M Deserno; Shahin Tabatabaei; Christine Hulsbergen van de Kaa; Jean de la Rosette; Ralph Weissleder Journal: N Engl J Med Date: 2003-06-19 Impact factor: 91.245
Authors: Yoshimi Anzai; Catherine W Piccoli; Eric K Outwater; William Stanford; David A Bluemke; Pamela Nurenberg; Sanjay Saini; Kenneth R Maravilla; David E Feldman; Udo P Schmiedl; James A Brunberg; Isaac R Francis; Steven E Harms; Peter M Som; Clare M Tempany Journal: Radiology Date: 2003-09 Impact factor: 11.105
Authors: Jason S Weinstein; Csanad G Varallyay; Edit Dosa; Seymur Gahramanov; Bronwyn Hamilton; William D Rooney; Leslie L Muldoon; Edward A Neuwelt Journal: J Cereb Blood Flow Metab Date: 2009-09-16 Impact factor: 6.200
Authors: Dipanjan Pan; Shelton D Caruthers; Junjie Chen; Patrick M Winter; Angana SenPan; Anne H Schmieder; Samuel A Wickline; Gregory M Lanza Journal: Future Med Chem Date: 2010-03 Impact factor: 3.808
Authors: Patrick M Winter; Shelton D Caruthers; Gregory M Lanza; Samuel A Wickline Journal: J Cardiovasc Magn Reson Date: 2010-11-03 Impact factor: 5.364