Publication date: Available online 1 March 2017
Source:Radiotherapy and Oncology
Author(s): Hans Ligtenberg, Elise Anne Jager, Joana Caldas-Magalhaes, Tim Schakel, Frank A. Pameijer, Nicolien Kasperts, Stefan M. Willems, Chris H.J. Terhaard, Cornelis P.J. Raaijmakers, Marielle E.P. Philippens
Background and purposeThe goal of this study was to improve target definition by deriving modality-specific margins for clinical target volumes (CTV) for laryngeal and hypopharyngeal cancer on CT, MRI and 18-FDG-PET.Material and methodsTwenty-five patients with T3/T4 laryngeal/hypopharyngeal cancer underwent CT, MRI and 18-FDG-PET scans before laryngectomy. HE-sections were obtained from the surgical specimen and tumor was delineated (tumorHE). The GTVs on CT and MRI were delineated in consensus. PET-based GTVs were automatically segmented. The three-dimensionally reconstructed specimen was registered to the various images. Modality-specific CTV margins were derived and added to the GTVs to achieve adequate tumor coverage. The resulting CTVs were compared with each other, to tumorHE, and to CTVCT10 constructed on CT with the clinical margin of 10mm.ResultsCTV margins of 4.3mm (CT), 6.1mm (MRI) and 5.2mm (PET) were needed to achieve adequate tumor coverage. The median volumes of the resulting modality-specific CTVs were 44ml (CT), 48ml (MRI) and 39ml (PET), while the CTV10mm was 80ml.ConclusionFor laryngohypopharyngeal tumors, 45–52% target volume reduction compared with CTV10mm is achievable when modality-specific CTV margins are used. PET-based CTVs were significantly smaller compared to CT- and MRI-based CTVs.
http://ift.tt/2lDMl1f
Σφακιανάκης Αλέξανδρος
ΩτοΡινοΛαρυγγολόγος
Αναπαύσεως 5 Άγιος Νικόλαος
Κρήτη 72100
00302841026182
00306932607174
alsfakia@gmail.com
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! # Ola via Alexandros G.Sfakianakis on Inoreader
Η λίστα ιστολογίων μου
Πέμπτη 2 Μαρτίου 2017
Modality-specific target definition for laryngeal and hypopharyngeal cancer on FDG-PET, CT and MRI
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