Abstract # 2057 Repositioning Accuracy Of Two Different Mask Systems: A Comparison By True 3D-3D Matching With Cone-Beam CT

Presenter: Boda-Heggemann, Judit

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patients receiving radiotherapy for intracranial/head and neck tumors were
enrolled. 14 patients were positioned in rigid masks (Delta-Cast EliteTM);
9 in thermoplastic masks. CBCT volume imaging was performed before each
treatment fraction, and was analysed online for immediate correction and also
in detail afterwards offline. Offline matching was performed either limited to
the intracranial region or restricted to the neck region by different
physicians and by an automatic bone matching algorithm (138 alignments). X, y
and z components of translation of the target isocenter, the calculated
absolute magnitude target isocenter translation vector and target isocenter
rotation in x, y and z directions were analysed for each registration.

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