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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