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- Title
Imaging protocols for renal multiparametric MRI and MR urography: results of a consensus conference from the French Society of Genitourinary Imaging.
- Authors
Rouvière, Olivier; Cornelis, François; Brunelle, Serge; Roy, Catherine; André, Marc; Bellin, Marie-France; Boulay, Isabelle; Eiss, David; Girouin, Nicolas; Grenier, Nicolas; Hélénon, Olivier; Lapray, Jean-François; Lefèvre, Arnaud; Matillon, Xavier; Ménager, Jean-Michel; Millet, Ingrid; Ronze, Sébastien; Sanzalone, Thomas; Tourniaire, Jean; Rocher, Laurence
- Abstract
<bold>Objectives: </bold>To develop technical guidelines for magnetic resonance imaging aimed at characterising renal masses (multiparametric magnetic resonance imaging, mpMRI) and at imaging the bladder and upper urinary tract (magnetic resonance urography, MRU).<bold>Methods: </bold>The French Society of Genitourinary Imaging organised a Delphi consensus conference with a two-round Delphi survey followed by a face-to-face meeting. Two separate questionnaires were issued for renal mpMRI and for MRU. Consensus was strictly defined using a priori criteria.<bold>Results: </bold>Forty-two expert uroradiologists completed both survey rounds with no attrition between the rounds. Fifty-six of 84 (67%) statements of the mpMRI questionnaire and 44/71 (62%) statements of the MRU questionnaire reached final consensus. For mpMRI, there was consensus that no injection of furosemide was needed and that the imaging protocol should include T2-weighted imaging, dual chemical shift imaging, diffusion-weighted imaging (use of multiple b-values; maximal b-value, 1000 s/mm2) and fat-saturated single-bolus multiphase (unenhanced, corticomedullary, nephrographic) contrast-enhanced imaging; late imaging (more than 10 min after injection) was judged optional. For MRU, the patients should void their bladder before the examination. The protocol must include T2-weighted imaging, anatomical fast T1/T2-weighted imaging, diffusion-weighted imaging (use of multiple b-values; maximal b-value, 1000 s/mm2) and fat-saturated single-bolus multiphase (unenhanced, corticomedullary, nephrographic, excretory) contrast-enhanced imaging. An intravenous injection of furosemide is mandatory before the injection of contrast medium. Heavily T2-weighted cholangiopancreatography-like imaging was judged optional.<bold>Conclusion: </bold>This expert-based consensus conference provides recommendations to standardise magnetic resonance imaging of kidneys, ureter and bladder.<bold>Key Points: </bold>• Multiparametric magnetic resonance imaging (mpMRI) aims at characterising renal masses; magnetic resonance urography (MRU) aims at imaging the urinary bladder and the collecting systems. • For mpMRI, no injection of furosemide is needed. • For MRU, an intravenous injection of furosemide is mandatory before the injection of contrast medium; heavily T2-weighted cholangiopancreatography-like imaging is optional.
- Subjects
MAGNETIC resonance imaging; BLADDER; DIFFUSION magnetic resonance imaging; URINARY organs; INTRAVENOUS injections
- Publication
European Radiology, 2020, Vol 30, Issue 4, p2103
- ISSN
0938-7994
- Publication type
journal article
- DOI
10.1007/s00330-019-06530-z