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@ARTICLE{Henkner:126709,
      author       = {K. Henkner and M. Winter and G. Echner$^*$ and B. Ackermann
                      and S. Brons and J. Horn and O. Jäkel$^*$ and C.
                      Karger$^*$},
      title        = {{A} motorized solid-state phantom for patient-specific dose
                      verification in ion beam radiotherapy.},
      journal      = {Physics in medicine and biology},
      volume       = {60},
      number       = {18},
      issn         = {1361-6560},
      address      = {Bristol},
      publisher    = {IOP Publ.},
      reportid     = {DKFZ-2017-02737},
      pages        = {7151 - 7163},
      year         = {2015},
      abstract     = {For regular quality assurance and patient-specific
                      dosimetric verification under non-horizontal gantry angles
                      in ion beam radiotherapy, we developed and commissioned a
                      motorized solid state phantom. The phantom is set up under
                      the selected gantry angle and moves an array of 24
                      ionization chambers to the measurement position by means of
                      three eccentrically-mounted cylinders. Hence, the phantom
                      allows 3D dosimetry at oblique gantry angles. To achieve the
                      high standards in dosimetry, the mechanical and dosimetric
                      accuracy of the phantom was investigated and corrections for
                      residual uncertainties were derived. Furthermore, the exact
                      geometry as well as a coordinate transformation from
                      cylindrical into Cartesian coordinates was determined. The
                      developed phantom proved to be suitable for quality
                      assurance and 3D-dose verifications for proton- and carbon
                      ion treatment plans at oblique gantry angles. Comparing dose
                      measurements with the new phantom under oblique gantry
                      angles with those in a water phantom and horizontal beams,
                      the dose deviations averaged over the 24 ionization chambers
                      were within $1.5\%.$ Integrating the phantom into the HIT
                      treatment plan verification environment, allows the use of
                      established workflow for verification measurements.
                      Application of the phantom increases the safety of patient
                      plan application at gantry beam lines.},
      cin          = {E040},
      ddc          = {570},
      cid          = {I:(DE-He78)E040-20160331},
      pnm          = {315 - Imaging and radiooncology (POF3-315)},
      pid          = {G:(DE-HGF)POF3-315},
      typ          = {PUB:(DE-HGF)16},
      pubmed       = {pmid:26334387},
      doi          = {10.1088/0031-9155/60/18/7151},
      url          = {https://inrepo02.dkfz.de/record/126709},
}