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Abstract #0657

Pulmonary MRA: Differentiation of pulmonary embolism from Gibbs artifact

Peter Bannas 1,2 , Mark L Schiebler 1 , Utaroh Motosugi 1 , Christopher J Francois 1 , Scott B Reeder 1,3 , and Scott K Nagle 1,3

1 Department of Radiology, University of Wisconsin, Madison, Madison, WI, United States, 2 Department of Radiology, University Medical Center Hamburg-Eppendorf, Hamburg, Hamburg, Germany, 3 Department of Medical Physics, University of Wisconsin, Madison, Madison, WI, United States

The aim of our study was to establish a quantitative and objective approach to differentiate Gibbs artifact from true pulmonary emboli, in order to improve the diagnostic performance of pulmonary MRA for diagnosis of pulmonary embolism. The percentage of signal loss between the vessel lumen and the central dropout was calculated on both first-pass and steady state MRA from 65 signal drops in 28 patients. Gibbs artifacts revealed a significantly lower signal drop as compared to pulmonary embolism. ROC analyses suggest an optimum threshold value of 53% (first-pass) and 42%-signal drop (steady state) to differentiate between Gibbs artifact and PE.

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