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Abstract #3907

On the deviation of actual isocenter slice position in magnetic resonance imaging

Julian Emmerich1, Sina Straub1, and Frederik Bernd Laun1,2

1Medical Physics in Radiology, German Cancer Research Center (DKFZ), Heidelberg, Germany, 2Institute of Radiology, University Hospital Erlangen, Erlangen, Germany

Due to imperfect laser positioning, actual isocenter slicepositions can deviate from manufacturer indication. Using MRI as tool for dose planning in MR guided radiation therapy, the geometric correct position of MR-slices is an essential quality parameter that can affect dose calculation and definition of the planning target volume (PTV). To evaluate the magnitude of the deviation of the actual slice position from the true isocenter of the scanner, a phantom study was performed. Scanner-dependent deviations in isocenter slice position occurred in the range of 1 mm - 5 mm.

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