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Strahlentherapie und Onkologie

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01-07-2021 | Magnetic Resonance Imaging | Original Article

Comparison of treatment position with mask immobilization and standard diagnostic setup in intracranial MRI radiotherapy simulation

Authors: Vesna Mekiš, Valerija Žager Marciuš, Dominika Rogina, Laura Dolenc, Nejc Mekiš

Published in: Strahlentherapie und Onkologie | Issue 7/2021

Abstract

Purpose

This study aims to compare the quality of images resulting from magnetic resonance imaging of patients who underwent intracranial MRI simulation using two different setups (treatment position with mask immobilization and standard diagnostic setup). Due to a larger number of channels and lack of mask immobilization in the standard diagnostic setup, we would like to evaluate whether this is an appropriate technique for MRI treatment planning.

Methods

In total, 70 patients who underwent MR imaging of the brain at 1.5T were included in the study (48 for 6‑channel flex coil, 22 for 24-channel HNU face bill coil). Contrast-enhanced 3D T1w and T2 FLAIR images were acquired. Images were subjectively compared for artifact appearance and general image quality by three radiographers. Objective comparison of contrast rate, contrast-to-noise ratio, and signal-to-noise ratio was also performed.

Results

FLAIR and contrast-enhanced 3D T1w images showed various artifacts, such as susceptibility and movement artifacts. There were no statistically significant differences regarding the evaluation of movement artifacts between two coils and two different immobilization methods. There were also no statistically significant differences (p > 0.05) between the 6‑channel flex coil and 24-channel HNU face bill coil regarding qualitative general image quality and objective measures.

Conclusion

There were no statistically significant differences between the occurrence of movement artifacts, overall image quality, and objective image quality in treatment position with mask immobilization and standard diagnostic setup. Based on this result, we can conclude that a standard diagnostic setup is also applicable in intracranial MRI treatment planning with no loss to image quality. Registration of the imaging plans was not performed in this study; therefore, it might still be necessary to perform measurements of tumor delineation matching and geometrical accuracy acceptance in our institution.

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Title: Comparison of treatment position with mask immobilization and standard diagnostic setup in intracranial MRI radiotherapy simulation
Authors: Vesna Mekiš
Valerija Žager Marciuš
Dominika Rogina
Laura Dolenc
Nejc Mekiš
Publication date: 01-07-2021
Publisher: Springer Berlin Heidelberg
Keywords: Magnetic Resonance Imaging
Magnetic Resonance Imaging
Brain Tumor
Radiotherapy
Published in: Strahlentherapie und Onkologie / Issue 7/2021
Print ISSN: 0179-7158
Electronic ISSN: 1439-099X
DOI: https://doi.org/10.1007/s00066-021-01776-3

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Comparison of treatment position with mask immobilization and standard diagnostic setup in intracranial MRI radiotherapy simulation

Abstract

Purpose

Methods

Results

Conclusion

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