caa a22 4500 605495483 CHVBK 20210128100531.0 cr unu---uuuuu 210128e20150201xx s 000 0 eng 10.1007/s00261-014-0215-9 doi (NATIONALLICENCE)springer-10.1007/s00261-014-0215-9 Diffusion-weighted imaging of the liver: comparison of image quality between monopolar and bipolar acquisition schemes at 3T [Elektronische Daten] [Andrew Rosenkrantz, Christian Geppert, Michael Kiritsy, Thorsten Feiweier, David Mossa, Hersh Chandarana] Purpose: To compare image quality of monopolar and bipolar diffusion-weighted imaging (DWI) sequences of the liver at 3T. Methods: 32 healthy volunteers (mean 27±8years; 27M/5F) and 11 patients (mean age 58±14years; 8M/3F) underwent liver MRI using a 3T system incorporating 2-channel parallel transmission for B1-shimming and reduced B1-inhomogeneity. Scans included free-breathing DWI sequences (b-value 0, 400, 800s/mm2) acquired using both monopolar and bipolar techniques. Estimated signal-to-noise ratio (eSNR), apparent diffusion coefficient (ADC), and measures of subjective image quality on b-800 images, scored on a 1-5 scale by two independent radiologists, were compared between sequences. Results: Monopolar sequence demonstrated significantly higher eSNR (volunteers: 12.7±4.0 vs. 11.3±3.5, patients: 11.4±4.0 vs. 10.2±3.3; p≤0.013) compared with the bipolar sequence. Monopolar sequence also achieved significantly higher scores for reader 1 in volunteers and patients in terms of clarity of right lobe edge, clarity of intra-hepatic vessels, conspicuity of the left lobe, and overall diagnostic quality (p≤0.031), as well as significantly higher scores for reader 2 in volunteers in terms of clarity of intra-hepatic vessels, conspicuity of the left lobe, and overall diagnostic quality (p≤0.035). Respiratory motion artifact was not significantly different between sequences in patients or volunteers for either reader (p≥0.191). Hepatic ADC was significantly lower using monopolar technique only in volunteers (1.28±0.12 vs. 1.43±0.15, p<0.001). Conclusion: In comparison with past studies performed at 1.5T, when using a modern 3T system, we observed improved image quality of liver DWI using a monopolar, rather than a bipolar, acquisition scheme, largely attributed to higher eSNR. Springer Science+Business Media New York, 2014 Liver nationallicence 3T MRI nationallicence Diffusion-weighted imaging nationallicence Image quality nationallicence Monopolar gradients nationallicence Bipolar gradients nationallicence Rosenkrantz Andrew Department of Radiology, NYU Langone Medical Center, 550 First Avenue, 10016, New York, NY, USA aut Geppert Christian Siemens Medical Solutions, New York, NY, USA aut Kiritsy Michael Department of Radiology, NYU Langone Medical Center, 550 First Avenue, 10016, New York, NY, USA aut Feiweier Thorsten Siemens Healthcare, Erlangen, Germany aut Mossa David Department of Radiology, NYU Langone Medical Center, 550 First Avenue, 10016, New York, NY, USA aut Chandarana Hersh Department of Radiology, NYU Langone Medical Center, 550 First Avenue, 10016, New York, NY, USA aut Abdominal Imaging Springer US; http://www.springer-ny.com 40/2(2015-02-01), 289-298 0942-8925 40:2<289 2015 40 261 https://doi.org/10.1007/s00261-014-0215-9 text/html Onlinezugriff via DOI BK010053 XK010053 XK010000 Metadata rights reserved Springer special CC-BY-NC licence nationallicence 1 research-article jats NATIONALLICENCE NATIONALLICENCE NL-springer NATIONALLICENCE 856 40 https://doi.org/10.1007/s00261-014-0215-9 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Rosenkrantz Andrew Department of Radiology, NYU Langone Medical Center, 550 First Avenue, 10016, New York, NY, USA aut NATIONALLICENCE 700 1- Geppert Christian Siemens Medical Solutions, New York, NY, USA aut NATIONALLICENCE 700 1- Kiritsy Michael Department of Radiology, NYU Langone Medical Center, 550 First Avenue, 10016, New York, NY, USA aut NATIONALLICENCE 700 1- Feiweier Thorsten Siemens Healthcare, Erlangen, Germany aut NATIONALLICENCE 700 1- Mossa David Department of Radiology, NYU Langone Medical Center, 550 First Avenue, 10016, New York, NY, USA aut NATIONALLICENCE 700 1- Chandarana Hersh Department of Radiology, NYU Langone Medical Center, 550 First Avenue, 10016, New York, NY, USA aut NATIONALLICENCE 773 0- Abdominal Imaging Springer US; http://www.springer-ny.com 40/2(2015-02-01), 289-298 0942-8925 40:2<289 2015 40 261