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    Considering tumour volume for motion corrected DWI of colorectal liver metastases increases sensitivity of ADC to detect treatment-induced changes

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    Authors
    Pathak, Ryan
    Tian, J
    Thacker, N
    Morris, D
    Ragheb, H
    Saunders, C
    Saunders, Mark P
    Jackson, A
    Affiliation
    University of Manchester, Wolfson Molecular Imaging Centre, Manchester, UK
    Issue Date
    2019
    
    Metadata
    Show full item record
    Abstract
    ADC is a potential post treatment imaging biomarker in colorectal liver metastasis however measurements are affected by respiratory motion. This is compounded by increased statistical uncertainty in ADC measurement with decreasing tumour volume. In this prospective study we applied a retrospective motion correction method to improve the image quality of 15 tumour data sets from 11 patients. We compared repeatability of ADC measurements corrected for motion artefact against non-motion corrected acquisition of the same data set. We then applied an error model that estimated the uncertainty in ADC repeatability measurements therefore taking into consideration tumour volume. Test-retest differences in ADC for each tumour, was scaled to their estimated measurement uncertainty, and 95% confidence limits were calculated, with a null hypothesis that there is no difference between the model distribution and the data. An early post treatment scan (within 7 days of starting treatment) was acquired for 12 tumours from 8 patients. When accounting for both motion artefact and statistical uncertainty due to tumour volumes, the threshold for detecting significant post treatment changes for an individual tumour in this data set, reduced from 30.3% to 1.7% (95% limits of agreement). Applying these constraints, a significant change in ADC (5th and 20th percentiles of the ADC histogram) was observed in 5 patients post treatment. For smaller studies, motion correcting data for small tumour volumes increased statistical efficiency to detect post treatment changes in ADC. Lower percentiles may be more sensitive than mean ADC for colorectal metastases.
    Citation
    Pathak R, Tian J, Thacker NA, Morris DM, Ragheb H, Saunders C, et al. Considering tumour volume for motion corrected DWI of colorectal liver metastases increases sensitivity of ADC to detect treatment-induced changes. Sci Rep. 2019 Mar 7;9(1):3828.
    Journal
    Scientific Reports
    URI
    http://hdl.handle.net/10541/621785
    DOI
    10.1038/s41598-019-40565-y
    PubMed ID
    30846790
    Additional Links
    https://dx.doi.org/10.1038/s41598-019-40565-y
    Type
    Article
    Language
    en
    ae974a485f413a2113503eed53cd6c53
    10.1038/s41598-019-40565-y
    Scopus Count
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