Ringe KI Luetkens JA Fimmers R Hammerstingl RM Layer G Maurer MH Nähle CP Michalik S Reimer P Schraml C Schreyer AG Stumpp P Vogl TJ Wacker FK Willinek W Kukuk GM 2018 PURPOSE To assess the interrater agreement and reliability of experienced abdominal radiologists in the characterization and grading of arterial phase gadoxetate disodium-related respiratory motion artifact on liver MRI. MATERIALS AND METHODS This prospective multicenter study was initiated by the working group for abdominal imaging within the German Roentgen Society (DRG), and approved by the local IRB of each participating center. 11 board-certified radiologists independently reviewed 40 gadoxetate disodium-enhanced liver MRI datasets. Motion artifacts in the arterial phase were assessed on a 5-point scale. Interrater agreement and reliability were calculated using the intraclass correlation coefficient (ICC) and Kendall coefficient of concordance (W), with p < 0.05 deemed significant. RESULTS The ICC for interrater agreement and reliability were 0.983 (CI 0.973 - 0.990) and 0.985 (CI 0.978 - 0.991), respectively (both p < 0.0001), indicating excellent agreement and reliability. Kendall's W for interrater agreement was 0.865. A severe motion artifact, defined as a mean motion score ≥ 4 in the arterial phase was observed in 12 patients. In these specific cases, a motion score ≥ 4 was assigned by all readers in 75 % (n = 9/12 cases). CONCLUSION Differentiation and grading of arterial phase respiratory motion artifact is possible with a high level of inter-/intrarater agreement and interrater reliability, which is crucial for assessing the incidence of this phenomenon in larger multicenter studies. KEY POINTS · Inter- and intrarater agreement for motion artifact scoring is excellent among experienced readers.. · Interrater reliability for motion artifact scoring is excellent among experienced readers.. · Characterization of severe motion artifacts proved feasible in this multicenter study.. CITATION FORMAT · Ringe KI, Luetkens JA, Fimmers R et al. Characterization of Severe Arterial Phase Respiratory Motion Artifact on Gadoxetate Disodium-Enhanced MRI - Assessment of Interrater Agreement and Reliability. Fortschr Röntgenstr 2017; 190: 341 - 347. application/pdf https://sonar.ch/global/documents/235852 eng info:eu-repo/semantics/altIdentifier/doi/10.1055/s-0044-100727 info:eu-repo/semantics/altIdentifier/pmid/29448290 info:eu-repo/semantics/openAccess RoFo : Fortschritte auf dem Gebiete der Rontgenstrahlen und der Nuklearmedizin. - 2018 Artifacts Attitude of Health Personnel Gadolinium DTPA Germany Injections, Intravenous Liver Magnetic Resonance Imaging Observer Variation Prospective Studies Pulsatile Flow Radiologists Reproducibility of Results Respiratory Mechanics Switzerland Characterization of Severe Arterial Phase Respiratory Motion Artifact on Gadoxetate Disodium-Enhanced MRI - Assessment of Interrater Agreement and Reliability. http://purl.org/coar/resource_type/c_6501