P Mürtz1, M Kaschner2, A Lakghomi3, J Gieseke4, W A Willinek5, H H Schild6, D Thomas7. 1. Department of Radiology, University of Bonn, Sigmund-Freud-Straße 25, 53105 Bonn, Germany. Electronic address: petra.muertz@ukb.uni-bonn.de. 2. Department of Radiology, University of Bonn, Sigmund-Freud-Straße 25, 53105 Bonn, Germany. Electronic address: Marius.Kaschner@med.uni-duesseldorf.de. 3. Department of Radiology, University of Bonn, Sigmund-Freud-Straße 25, 53105 Bonn, Germany. Electronic address: Asadeh.Lakghomi@ukb.uni-bonn.de. 4. Philips Healthcare, Lübeckertordamm 5, 20099 Hamburg, Germany; Department of Radiology, University of Bonn, Sigmund-Freud-Straße 25, 53105 Bonn, Germany. Electronic address: juergen.gieseke@ukb.uni-bonn.de. 5. Department of Radiology, University of Bonn, Sigmund-Freud-Straße 25, 53105 Bonn, Germany. Electronic address: winfried.willinek@ukb.uni-bonn.de. 6. Department of Radiology, University of Bonn, Sigmund-Freud-Straße 25, 53105 Bonn, Germany. Electronic address: hans.schild@ukb.uni-bonn.de. 7. Department of Radiology, University of Bonn, Sigmund-Freud-Straße 25, 53105 Bonn, Germany. Electronic address: daniel.thomas@ukb.uni-bonn.de.
Abstract
PURPOSE: To compare intraindividually the nerve conspicuity of the brachial and lumbosacral plexus on diffusion-weighted (DW) MR neurography (MRN) at two different field strengths. MATERIALS AND METHODS: 16 healthy volunteers were investigated at 3.0 T and 1.5 T applying optimized variants of a DW spin-echo echo-planar imaging sequence with short TI inversion recovery fat suppression. Full-volume (FV) and curved sub-volume (CSV) maximum intensity projection (MIP) images were reconstructed and nerve conspicuity was visually assessed. Moreover, visible length and sharpness of the nerves were quantitatively analyzed. RESULTS: On FV MIP images, nerve conspicuity at 3.0 T compared to 1.5 T was worse for brachial plexus (P=0.00228), but better for lumbosacral plexus (P=0.00666). On CSV MIP images, nerve conspicuity did not differ significantly for brachial plexus, but was better at 3.0 T for lumbosacral plexus (P=0.00091). The visible length of the analyzed nerves did not differ significantly with the exception of some lumbosacral nerves, which were significantly longer at 3.0 T. The sharpness of all investigated nerves was significantly higher at 3.0 T by about 40-60% for cervical and 97-169% for lumbosacral nerves. CONCLUSION: DW MRN imaging at 3.0 T compared to 1.5 T is superior for lumbosacral plexus, but not for brachial plexus.
PURPOSE: To compare intraindividually the nerve conspicuity of the brachial and lumbosacral plexus on diffusion-weighted (DW) MR neurography (MRN) at two different field strengths. MATERIALS AND METHODS: 16 healthy volunteers were investigated at 3.0 T and 1.5 T applying optimized variants of a DW spin-echo echo-planar imaging sequence with short TI inversion recovery fat suppression. Full-volume (FV) and curved sub-volume (CSV) maximum intensity projection (MIP) images were reconstructed and nerve conspicuity was visually assessed. Moreover, visible length and sharpness of the nerves were quantitatively analyzed. RESULTS: On FV MIP images, nerve conspicuity at 3.0 T compared to 1.5 T was worse for brachial plexus (P=0.00228), but better for lumbosacral plexus (P=0.00666). On CSV MIP images, nerve conspicuity did not differ significantly for brachial plexus, but was better at 3.0 T for lumbosacral plexus (P=0.00091). The visible length of the analyzed nerves did not differ significantly with the exception of some lumbosacral nerves, which were significantly longer at 3.0 T. The sharpness of all investigated nerves was significantly higher at 3.0 T by about 40-60% for cervical and 97-169% for lumbosacral nerves. CONCLUSION: DW MRN imaging at 3.0 T compared to 1.5 T is superior for lumbosacral plexus, but not for brachial plexus.
Authors: Elisabeth Klupp; Barbara Cervantes; Nico Sollmann; Franziska Treibel; Dominik Weidlich; Thomas Baum; Ernst J Rummeny; Claus Zimmer; Jan S Kirschke; Dimitrios C Karampinos Journal: Clin Neuroradiol Date: 2018-07-23 Impact factor: 3.649