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A stenosis grade of 50% or more was considered haemodynamically significant. The potential of NCE-MRA for detection of stenosis was compared to CE-MRA, which was used as the standard of reference. The total number of visible segments as well as the mean artefact score and vessel-to-background values in healthy volunteers and ESRD patients were compared using the non-parametric McNemar and Wilcoxon signed ranks tests for paired find more samples. Interobserver agreement regarding diagnostic image quality (image quality?��?2) was assessed by the Cohen k test (k?<?0 indicating no agreement and 0�C0.20 as slight, 0.21�C0.40 as fair, 0.41�C0.60 as moderate, 0.61�C0.80 as substantial and 0.81�C1 as almost perfect agreement).20 In all statistical analyses, p values <0.05 were considered to be statistically significant. All statistical analyses were performed using Statistical Package for the Social Sciences (SPSS) 17.0.0 (SPSS Inc, Chicago, IL, USA) for Windows (Microsoft, Redmond, WA, USA). All CE-MRA and NCE-MRA examinations were performed successfully. No side effects after administration of GBCA were noted. None of the patients developed any symptoms of NSF (mean follow-up: 586?��?100 days). Results of objective and subjective image quality are listed in Table?3A. Typical examples of CE-MRA and NCE-MRA acquisitions are shown in Figure?2?and?Figure?3. For the arterial vascular tree, CE-MRA resulted in superior image quality and less artefacts <a href="http://www.selleckchem.com/products/ABT-737.html">ABT-737 order due to flow or magnetic field inhomogeneity, compared to NCE-MRA. In addition, CE-MRA resulted in a better vessel-to-background ratio when compared to NCE-MRA. On the other hand, for the venous system, NCE-MRA resulted in visualisation of more vessel segments, better image quality and higher vessel-to-background ratio compared to CE-MRA. However, NCE-MRA examinations were prone to more flow- and magnetic field inhomogeneity Temozolomide artefacts. In healthy volunteers, there was moderate interobserver agreement regarding the determination of diagnostic image quality in NCE-MRA and CE-MRA sequences. Kappa values were 0.50 and 0.58, for NCE-MRA and CE-MRA, respectively. In the ESRD patient population we found superior arterial depiction with CE-MRA compared to NCE-MRA, as well as less artefacts related to flow or magnetic field inhomogeneity. On the other hand, more venous segments were visualised using NCE-MRA. Image quality for veins was comparable with the two sequences (Table?3B). Flow- and black-banding artefacts were not present in the CE-MRA images. There was moderate interobserver agreement regarding the determination of diagnostic image quality in NCE-MRA (k?=?0.51) and a good interobserver agreement in CE-MRA (k?=?0.64).
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