Wieviele respiratorische Gates? Einfluss der Anzahl an Gates auf atem-getriggerte PET Aufnahmen Mohammad Dawood, Florian Büther, Ottmar Schober, M Schäfers,

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Presentation transcript:

Wieviele respiratorische Gates? Einfluss der Anzahl an Gates auf atem-getriggerte PET Aufnahmen Mohammad Dawood, Florian Büther, Ottmar Schober, M Schäfers, Klaus P Schäfers Euoropean Institute of Molecular Imaging, University of Münster

M. Dawood, European Institute of Molecular Imaging, Münster Motivation 18F-FDG PET 1 h.p.i., 9 gated Patient data sets OSEM reconstruction from listmode data

M. Dawood, European Institute of Molecular Imaging, Münster Acquisition of respiratory signal Dawood et al, Medical Physics, Sep. 2007

M. Dawood, European Institute of Molecular Imaging, Münster Variations in respiratory signals Relation between variations in amplitude and cycle length

M. Dawood, European Institute of Molecular Imaging, Münster Respiratory gating Dawood et al, Medical Physics, Sep Amplitude based gating Time based gating

M. Dawood, European Institute of Molecular Imaging, Münster Motion

M. Dawood, European Institute of Molecular Imaging, Münster Results: Capturing the motion Optimal gating is achieved with amplitude based gating using 8 gates

M. Dawood, European Institute of Molecular Imaging, Münster No change in noise properties with amplitude or time based gating Noise increases proportionally with the number og gates Amplitude based gating Time based gating Results: Noise properties

Vielen Dank für Ihre Aufmerksamkeit!