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    Towards a 'resolution limit' for DW-MRI tumor microstructural models: A simulation study investigating the feasibility of distinguishing between microstructural changes

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    Authors
    McHugh, Damien J
    Hubbard, Cristinacce PL
    Naish, JH
    Parker, Geoff J M
    Affiliation
    Division of Informatics, Imaging and Data Sciences, The University of Manchester, Manchester, United Kingdom
    Issue Date
    2018
    
    Metadata
    Show full item record
    Abstract
    PURPOSE: To determine the feasibility of extracting sufficiently precise estimates of cell radius, R, and intracellular volume fraction, fi , from DW-MRI data in order to distinguish between specific microstructural changes tissue may undergo, specifically focusing on cell death in tumors. METHODS: Simulations with optimized and non-optimized clinical acquisitions were performed for a range of microstructures, using a two-compartment model. The ability to distinguish between (i) cell shrinkage with cell density constant, mimicking apoptosis, and (ii) cell size constant with cell density decreasing, mimicking loss of cells, was evaluated based on the precision of simulated parameter estimates. Relationships between parameter precision, SNR, and the magnitude of specific parameter changes, were used to infer SNR requirements for detecting changes. RESULTS: Accuracy and precision depended on microstructural properties, SNR, and the acquisition protocol. The main benefit of optimized acquisitions tended to be improved accuracy and precision of R, particularly for small cells. In most cases considered, higher SNR was required for detecting changes in R than for changes in fi . CONCLUSIONS: Given the relative changes in R and fi due to apoptosis, simulations indicate that, for a range of microstructures, detecting changes in R require higher SNR than detecting changes in fi , and that such SNR is typically not achieved in clinical data. This suggests that if apoptotic cell size decreases are to be detected in clinical settings, improved SNR is required. Comparing measurement precision with the magnitude of expected biological changes should form part of the validation process for potential biomarkers.
    Citation
    McHugh DJ, Hubbard Cristinacce PL, Naish JH, Parker GJM. Towards a �resolution limit� for DW-MRI tumor microstructural models: A simulation study investigating the feasibility of distinguishing between microstructural changes. Magnetic Resonance in Medicine [Internet]. 2018 Oct 19.
    Journal
    Magn Reson Med
    URI
    http://hdl.handle.net/10541/621366
    DOI
    10.1002/mrm.27551
    PubMed ID
    30338871
    Additional Links
    https://dx.doi.org/10.1002/mrm.27551
    Type
    Article
    Language
    en
    ae974a485f413a2113503eed53cd6c53
    10.1002/mrm.27551
    Scopus Count
    Collections
    All Paterson Institute for Cancer Research

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