Consistency of Intensity-based Density Value Assignment for Bone Voxels for MR-only Simulation in Radiation Therapy Planning
Michael Helle 1 , Nicole Schadewaldt 1 , Heinrich Schulz 1 , Marloes Frantzen-Steneker 2 , Christian Stehning 1 , Uulke van der Heide 2 , and Steffen Renisch 1
Philips Research, Hamburg, Germany,
of Radiation Oncology, The Netherlands Cancer Institute,
Radiation therapy planning (RTP) based on magnetic
resonance imaging (MRI) is an emerging application that
benefits from the superior display of soft tissue
contrasts and the delineation of tumor and critical
organs. A new approach based on a Cartesian T1-Dixon
acquisition has been introduced which makes it possible
to classify soft tissue and cortical bone structures in
the pelvic region. In this study, the consistency of the
density value assignment of bone voxels is investigated
on patient datasets who received both MR and CT imaging.
The proposed assignment scheme gives correct overall
mass densities on a population level.
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