R Ma Cañón1, I Azinovic, M Lobato, J Navarro, J Rebollo. 1. Oncología Radioterápica, Plataforma de Oncología, USP Hospital San Jaime, Torrevieja, Alicante, Spain. rosam.canon@usphospitales.com
Abstract
PURPOSE: Evaluate the fiducial marker-based position verification in the external-beam radiotherapy of patients with cranial tumour. METHODS: Thirteen patients with intracranial tumours were treated with external- beam radiotherapy using 3 gold markers implanted in the skull. Before each fraction the patient was positioned on the treatment table and 2 orthogonal portal images were performed to localise the 3 gold seeds and the target position was calculated using a commercialised computer program (ISOLOC software, MEDTEC). This program provides the couch movements required to move the target to the isocentre. RESULTS: When the set-up error was corrected using the coordinates of the 3 markers, the final movements were less than 2 mm in all cases: lateral, mean v., 1.21 mm; longitudinal, 1.23 mm; and anteroposterior, 1.18 mm. No serious complications related to the gold marker insertion were noted. CONCLUSION: The use of 3 implanted fiducial seeds is an optimal technique for precise set-up in patients with brain tumours treated with external radiotherapy. This commercial system is highly suitable for fractionated stereotactic irradiation.
PURPOSE: Evaluate the fiducial marker-based position verification in the external-beam radiotherapy of patients with cranial tumour. METHODS: Thirteen patients with intracranial tumours were treated with external- beam radiotherapy using 3 gold markers implanted in the skull. Before each fraction the patient was positioned on the treatment table and 2 orthogonal portal images were performed to localise the 3 gold seeds and the target position was calculated using a commercialised computer program (ISOLOC software, MEDTEC). This program provides the couch movements required to move the target to the isocentre. RESULTS: When the set-up error was corrected using the coordinates of the 3 markers, the final movements were less than 2 mm in all cases: lateral, mean v., 1.21 mm; longitudinal, 1.23 mm; and anteroposterior, 1.18 mm. No serious complications related to the gold marker insertion were noted. CONCLUSION: The use of 3 implanted fiducial seeds is an optimal technique for precise set-up in patients with brain tumours treated with external radiotherapy. This commercial system is highly suitable for fractionated stereotactic irradiation.
Authors: D Vetterli; H Riem; D M Aebersold; R H Greiner; P Manser; P Cossmann; L Kemmerling; E J Born; R Mini Journal: Med Phys Date: 2004-04 Impact factor: 4.071
Authors: F Lohr; J Debus; C Frank; K Herfarth; O Pastyr; B Rhein; M L Bahner; W Schlegel; M Wannenmacher Journal: Int J Radiat Oncol Biol Phys Date: 1999-09-01 Impact factor: 7.038