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Is the skull a suitable reference?
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A phantom study
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Reference CT dataset rotated with center of rotation at the center of the
image data set
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Positioning assessed by IR, water level, ExacTrac X-ray, portal films and
implanted markers
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SBRT 2016 - D. Verellen
Gevaert
et al.
Int J Radiat Oncol Biol Phys 2012