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 setsOSEM 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. 2007

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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 gatingNoise increases proportionally with the number og gates

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Results: Noise properties

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