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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