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    MRI commissioning of 1.5T MR-linac systems - a multi-institutional study

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    Authors
    Tijssen, N
    Philippens, P
    Paulson, S
    Glitzner, M
    Chugh, B
    Wetscherek, A
    Dubec, Michael
    Wang, J
    van der Heide, A
    Affiliation
    The Christie Hospital NHS Foundation Trust, Manchester
    Issue Date
    2019
    
    Metadata
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    Abstract
    BACKGROUND: Magnetic Resonance linear accelerator (MR-linac) systems represent a new type of technology that allows for online MR-guidance for high precision radiotherapy (RT). Currently, the first MR-linac installations are being introduced clinically. Since the imaging performance of these integrated MR-linac systems is critical for their application, a thorough commissioning of the MRI performance is essential. However, guidelines on the commissioning of MR-guided RT systems are not yet defined and data on the performance of MR-linacs are not yet available. MATERIALS & METHODS: Here we describe a comprehensive commissioning protocol, which contains standard MRI performance measurements as well as dedicated hybrid tests that specifically assess the interactions between the Linac and the MRI system. The commissioning results of four MR-linac systems are presented in a multi-center study. RESULTS: Although the four systems showed similar performance in all the standard MRI performance tests, some differences were observed relating to the hybrid character of the systems. Field homogeneity measurements identified differences in the gantry shim configuration, which was later confirmed by the vendor. CONCLUSION: Our results highlight the importance of dedicated hybrid commissioning tests and the ability to compare the machines between institutes at this very early stage of clinical introduction. Until formal guidelines and tolerances are defined the tests described in this study may be used as a practical guideline. Moreover, the multi-center results provide initial bench mark data for future MR-linac installations.
    Citation
    Tijssen N, Philippens P, Paulson S, Glitzner M, Chugh B, Wetscherek A, et al. MRI commissioning of 1.5T MR-linac systems - a multi-institutional study. Radiother Oncol. 2019 Mar;132:114-20.
    Journal
    Radiotherapy Oncology
    URI
    http://hdl.handle.net/10541/621693
    DOI
    10.1016/j.radonc.2018.12.011
    PubMed ID
    30825959
    Additional Links
    https://dx.doi.org/10.1016/j.radonc.2018.12.011
    Type
    Article
    Language
    en
    ae974a485f413a2113503eed53cd6c53
    10.1016/j.radonc.2018.12.011
    Scopus Count
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