Abstract
Purpose
To determine the test-retest repeatability of Apparent Diffusion Coefficient (ADC) measurements across institutions and MRI vendors, plus investigate the effect of post-processing methodology on measurement precision.
Methods
Thirty malignant lung lesions >2 cm in size (23 patients) were scanned on two occasions, using echo-planar-Diffusion-Weighted (DW)-MRI to derive whole-tumour ADC (b = 100, 500 and 800smm-2). Scanning was performed at 4 institutions (3 MRI vendors). Whole-tumour volumes-of-interest were copied from first visit onto second visit images and from one post-processing platform to an open-source platform, to assess ADC repeatability and cross-platform reproducibility.
Results
Whole-tumour ADC values ranged from 0.66-1.94x10-3mm2s-1 (mean = 1.14). Within-patient coefficient-of-variation (wCV) was 7.1% (95% CI 5.7–9.6%), limits-of-agreement (LoA) -18.0 to 21.9%. Lesions >3 cm had improved repeatability: wCV 3.9% (95% CI 2.9–5.9%); and LoA -10.2 to 11.4%. Variability for lesions <3 cm was 2.46 times higher. ADC reproducibility across different post-processing platforms was excellent: Pearson’s R2 = 0.99; CoV 2.8% (95% CI 2.3-3.4%); and LoA -7.4 to 8.0%.
Conclusion
A free-breathing DW-MRI protocol for imaging malignant lung tumours achieved satisfactory within-patient repeatability and was robust to changes in post-processing software, justifying its use in multi-centre trials. For response evaluation in individual patients, a change in ADC >21.9% will reflect treatment-related change.
Key Points
• In lung cancer, free-breathing DWI-MRI produces acceptable images with evaluable ADC measurement.
• ADC repeatability coefficient-of-variation is 7.1% for lung tumours >2 cm.
• ADC repeatability coefficient-of-variation is 3.9% for lung tumours >3 cm.
• ADC measurement precision is unaffected by the post-processing software used.
• In multicentre trials, 22% increase in ADC indicates positive treatment response.
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Abbreviations
- DW-MRI:
-
Diffusion-weighted magnetic resonance imaging
- ADC:
-
Apparent diffusion coefficient
- NSCLC:
-
Non small-cell lung cancer
- SCLC:
-
Small-cell lung cancer
- EORTC:
-
European Organization for Research and Treatment of Cancer
- CRUK:
-
Cancer Research UK
- UK:
-
United Kingdom
- GE:
-
General Electric
- STIR:
-
Short-tau inversion recovery
- NSA:
-
Number of signal averages
- LoA:
-
Limits of Agreement
- wCV:
-
Within subject Coefficient of Variation
- ICC:
-
Intra-class correlation
- CCC:
-
Concordance correlation coefficient
- IDL:
-
Interactive digital language
- DICOM:
-
Digital Imaging and Communications in Medicine
- EPSRC:
-
Engineering and Physical Sciences Research Council
- NIHR:
-
National Institute for Health Research (UK)
- NHS:
-
National Health Service
- ICR:
-
Institute of Cancer Research (UK)
- RMH:
-
Royal Marsden Hospital (UK)
- MRC:
-
Medical Research Council (UK)
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Acknowledgements
We acknowledge CRUK and EPSRC support to the Cancer Imaging Centre at ICR and RMH in association with MRC & Dept of Health C1060/A10334, C1060/A16464 and NHS funding to the NIHR Biomedical Research Centre and the Clinical Research Facility in Imaging. AW and M-VP were funded by Innovative Medicines Initiative Joint Undertaking under grant agreement number 115151.
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The scientific guarantor of this publication is Professor Nandita de-Souza
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The authors of this manuscript declare relationships with the following companies: Alderley Imaging Ltd (Waterton: Director; Stockholder); AstraZeneca (Waterton: Former employee; Stockholder).
Funding
The research leading to these results has received support from the Innovative Medicines Initiative Joint Undertaking (www.imi.europa.eu) under grant agreement number 115151, the resources of which are composed of financial contributions from the European Union's Seventh Framework Programme (FP7/2007-2013) and EFPIA companies’ in kind contribution. The authors are members of the QuIC-ConCePT Consortium whose participants include: AstraZeneca, European Organisation for Research and Treatment of Cancer (EORTC), University of Cambridge, University of Manchester, Westfälische Wilhelms-Universität Münster, Radboud University Nijmegen Medical Center, Institut National de la Santé et de la Recherche Médical, Stichting Maastricht Radiation Oncology “Maastro Clinic”, VUmc Amsterdam, King’s College London, Universitair Ziekenhuis Antwerpen, Institute of Cancer Research – Royal Cancer Hospital, Erasmus Universitair Medisch Centrum Rotterdam, Imperial College of Science Technology and Medicine, Keosys S.A.S., Eidgenössische Technische Hochschule Zürich, Amgen NV, Eli Lilly and Company Ltd, GlaxoSmithKline Research & Development Limited, Merck KGa, Pfizer Limited, F.Hoffmann - La Roche Ltd, Sanofi-Aventis Research and Development.
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Dr Matthew Orton (The Institute of Cancer Research, London, UK) kindly provided statistical advice for this manuscript.
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Institutional Review Board approval was obtained (UK REC reference 15/LO/0882).
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Written informed consent was obtained from all subjects (patients) in this study.
Methodology
• prospective
• cross-sectional study
• multicentre study
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Weller, A., Papoutsaki, M.V., Waterton, J.C. et al. Diffusion-weighted (DW) MRI in lung cancers: ADC test-retest repeatability. Eur Radiol 27, 4552–4562 (2017). https://doi.org/10.1007/s00330-017-4828-6
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DOI: https://doi.org/10.1007/s00330-017-4828-6