Impact of MRI on target volume definition in head and neck cancer patients.

Publisher: BioMed Central Country of Publication: England NLM ID: 101265111 Publication Model: Electronic Cited Medium: Internet ISSN: 1748-717X (Electronic) Linking ISSN: 1748717X NLM ISO Abbreviation: Radiat Oncol Subsets: MEDLINE

Original Publication: [London] : BioMed Central, 2006-

Head and Neck Neoplasms*/diagnostic imaging ; Head and Neck Neoplasms*/radiotherapy ; Radiation Oncology*; Humans ; Magnetic Resonance Imaging ; Chemoradiotherapy ; Patient Positioning

Background: Target volume definition for curative radiochemotherapy in head and neck cancer is crucial since the predominant recurrence pattern is local. Additional diagnostic imaging like MRI is increasingly used, yet it is usually hampered by different patient positioning compared to radiotherapy. In this study, we investigated the impact of diagnostic MRI in treatment position for target volume delineation.
Methods: We prospectively analyzed patients who were suitable and agreed to undergo an MRI in treatment position with immobilization devices prior to radiotherapy planning from 2017 to 2019. Target volume delineation for the primary tumor was first performed using all available information except for the MRI and subsequently with additional consideration of the co-registered MRI. The derived volumes were compared by subjective visual judgment and by quantitative mathematical methods.
Results: Sixteen patients were included and underwent the planning CT, MRI and subsequent definitive radiochemotherapy. In 69% of the patients, there were visually relevant changes to the gross tumor volume (GTV) by use of the MRI. In 44%, the GTV_MRI would not have been covered completely by the planning target volume (PTV) of the CT-only contour. Yet, median Hausdorff und DSI values did not reflect these differences. The 3-year local control rate was 94%.
Conclusions: Adding a diagnostic MRI in RT treatment position is feasible and results in relevant changes in target volumes in the majority of patients.
(© 2023. BioMed Central Ltd., part of Springer Nature.)

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Keywords: HNSCC; IMRT; Local control; MRI imaging; Radiotherapy; Target volume delineation

Date Created: 20230906 Date Completed: 20230908 Latest Revision: 20230922

20240514

PMC10483850

10.1186/s13014-023-02326-0

37674171