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What is the Setup Correction Threshold for Image Guided Head and Neck Radiotherapy? by J.L. Wloch; M. Matuszak; Q. Wu; D. Yan is a scholarly article available to read on EtoBox.

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Purpose/Objective(s): Parotid gland sparing IMRT in head and neck radiotherapy is feasible and reduces xerostomia. Sparing of the contralateral submandibular gland is now investigated as a further improvement for the treatment of oropharyngeal tumors. To ensure optimal tumor coverage and gland sparing, adequate fixation and position verification becomes more and more important. In this study we investigate the use of a patient specific thermoplast headrest for extra immobilization in combination with kV cone-beam CT for position verification. Further, our off-line position correction protocol is evaluated and optimized to further reduce systematic setup errors. Materials/Methods: Twenty head and neck cancer patients were immobilized with either standard (std, Posifix supine) or individual headrests (ind, both Civco, Kalona USA) in combination with an individual five-point thermoplastic mask. Cone-beam CTs (XVI, Elekta Stockholm Sweden) were made before and after the first five fractions and weekly thereafter. Position correction was done according to a NAL protocol. Positioning data were gathered and analyzed for random and systematic errors for several setup correction protocols,

Author

J.L. Wloch; M. Matuszak; Q. Wu; D. Yan

Publisher

Elsevier Science; Elsevier ; Elsevier BV (ISSN 0360-3016)

Published

2009

Language

EN