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Diffusion-weighted (DW) MRI in lung cancers: ADC test-retest repeatability

  • Magnetic Resonance
  • Published:
European Radiology Aims and scope Submit manuscript

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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Authors

Corresponding author

Correspondence to Alex Weller.

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Guarantor

The scientific guarantor of this publication is Professor Nandita de-Souza

Conflict of interest

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.

Statistics and biometry

Dr Matthew Orton (The Institute of Cancer Research, London, UK) kindly provided statistical advice for this manuscript.

Ethical approval

Institutional Review Board approval was obtained (UK REC reference 15/LO/0882).

Informed consent

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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