TY - JOUR
T1 - Off-resonance angiography
T2 - A new method to depict vessels-phantom and rabbit studies
AU - Korosoglou, Grigorios
AU - Shah, Saurabh
AU - Vonken, Evert Jan
AU - Gilson, Wesley D.
AU - Schär, Michael
AU - Tang, Lijun
AU - Kraitchman, Dara L.
AU - Boston, Raymond C.
AU - Sosnovik, David E.
AU - Weiss, Robert G.
AU - Weissleder, Ralph
AU - Stuber, Matthias
N1 - Copyright:
Copyright 2012 Elsevier B.V., All rights reserved.
PY - 2008/11
Y1 - 2008/11
N2 - Purpose: To evaluate the utility of inversion recovery with on-resonant water suppression (IRON) in combination with injection of the long-circulating monocrystalline iron oxide nanoparticle (MION)-47 for contrast material-enhanced magnetic resonance (MR) angiography. Materials and Methods: Experiments were approved by the institutional animal care committee. Eleven rabbits were imaged at baseline before injection of a contrast agent and then serially 5-30 minutes, 2 hours, 1 day, and 3 days after a single intravenous bolus injection of 80 μmol of MION-47 per kilogram of body weight (n = 6) or 250 μmol/kg MION-47 (n = 5). Conventional T1-weighted MR angiography and IRON MR angiography were performed on a clinical 3.0-T imager. Signal-to-noise and contrast-to-noise ratios were measured in the aorta of rabbits in vivo. Venous blood was obtained from the rabbits before and after MION-47 injection for use in phantom studies. Results: In vitro blood that contained MION-47 appeared signal attenuated on T1-weighted angiograms, while characteristic signal-enhanced dipolar fields were observed on IRON angiograms. In vivo, the vessel lumen was signal attenuated on T1-weighted MR angiograms after MION-47 injection, while IRON supported high intravascular contrast by simultaneously providing positive signal within the vessels and suppressing background tissue (mean contrast-to-noise ratio, 61.9 ± 12.4 [standard deviation] after injection vs 1.1 ± 0.4 at baseline, P < .001). Contrast-to-noise ratio was higher on IRON MR angiograms than on conventional T1-weighted MR angiograms (9.0 ± 2.5, P < .001 vs IRON MR angiography) and persisted up to 24 hours after MION-47 injection (76.2 ± 15.9, P < .001 vs baseline). Conclusion: IRON MR angiography in conjunction with superparamagnetic nanoparticle administration provides high intravascular contrast over a long time and without the need for image subtraction.
AB - Purpose: To evaluate the utility of inversion recovery with on-resonant water suppression (IRON) in combination with injection of the long-circulating monocrystalline iron oxide nanoparticle (MION)-47 for contrast material-enhanced magnetic resonance (MR) angiography. Materials and Methods: Experiments were approved by the institutional animal care committee. Eleven rabbits were imaged at baseline before injection of a contrast agent and then serially 5-30 minutes, 2 hours, 1 day, and 3 days after a single intravenous bolus injection of 80 μmol of MION-47 per kilogram of body weight (n = 6) or 250 μmol/kg MION-47 (n = 5). Conventional T1-weighted MR angiography and IRON MR angiography were performed on a clinical 3.0-T imager. Signal-to-noise and contrast-to-noise ratios were measured in the aorta of rabbits in vivo. Venous blood was obtained from the rabbits before and after MION-47 injection for use in phantom studies. Results: In vitro blood that contained MION-47 appeared signal attenuated on T1-weighted angiograms, while characteristic signal-enhanced dipolar fields were observed on IRON angiograms. In vivo, the vessel lumen was signal attenuated on T1-weighted MR angiograms after MION-47 injection, while IRON supported high intravascular contrast by simultaneously providing positive signal within the vessels and suppressing background tissue (mean contrast-to-noise ratio, 61.9 ± 12.4 [standard deviation] after injection vs 1.1 ± 0.4 at baseline, P < .001). Contrast-to-noise ratio was higher on IRON MR angiograms than on conventional T1-weighted MR angiograms (9.0 ± 2.5, P < .001 vs IRON MR angiography) and persisted up to 24 hours after MION-47 injection (76.2 ± 15.9, P < .001 vs baseline). Conclusion: IRON MR angiography in conjunction with superparamagnetic nanoparticle administration provides high intravascular contrast over a long time and without the need for image subtraction.
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U2 - 10.1148/radiol.2491071706
DO - 10.1148/radiol.2491071706
M3 - Article
C2 - 18780823
AN - SCOPUS:56149083342
VL - 249
SP - 501
EP - 509
JO - Radiology
JF - Radiology
SN - 0033-8419
IS - 2
ER -