[Repositioning accuracy of cerebral fractionated stereotactic radiotherapy using CT scanning]
Fiche publication
Date publication
septembre 2009
Auteurs
Membres identifiés du Cancéropôle Est :
Dr BERNIER-CHASTAGNER Valérie
Tous les auteurs :
Pasquier D, Dubus F, Castelain B, Delplanque M, Bernier V, Buchheit I, Kerr C, Santoro I, Huchet A, Causse N, Lartigau E
Lien Pubmed
Résumé
PURPOSE: To evaluate the accuracy of patient repositioning in fractionated cerebral stereotactic radiotherapy using a Brain Lab stereotactic cranial mask in conjunction with standard dental fixation. PATIENTS AND METHODS: Fifty planning and checking CT scans were performed in 25 patients. The check CT scan was performed before or after one of the three sessions of treatment. Coregistration to the planning CT scan was used to assess alignment of the isocentre to the reference markers. The relative position of the PTV with regard to isocentre allowed us to determine its total displacement (3D vector). RESULTS: Mean isocentre translations (+/-SD) taking into account direction were -0.01+/-0.7, -0.2+/-1.3 and 0.07+/-0.5mm in mediolateral, craniocaudal and anteroposterior directions respectively. Mean rotations (+/- SD) were -0.02+/-0.6, -0.08+/-0.3 and -0.1+/-0.3 degree in mediolateral, craniocaudal and anteroposterior axes respectively. Mean overall PTV displacement was 1.8+/-1.5mm. PTV displacement was smaller than 2 and 3mm in 19/25 and 23/25 patients respectively. CONCLUSION: The accuracy of patient positioning using a stereotactic cranial mask system is similar to those reported in the literature and shows a satisfactory reproducibility with a standard dental fixation.
Référence
Cancer Radiother. 2009 Sep;13(5):446-50