Quantitative and textural analysis of magnetization transfer and diffusion images in the early detection of brain metastases

Nicola L. Ainsworth, Mary A. McLean, Dominick J.O. McIntyre, Davina J. Honess, Anna M. Brown, Susan V. Harden, John R. Griffiths

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7 Citations (Scopus)

Abstract

Purpose: The sensitivity of the magnetization transfer ratio (MTR) and apparent diffusion coefficient (ADC) for early detection of brain metastases was investigated in mice and humans. Methods: Mice underwent MRI twice weekly for up to 31 d following intracardiac injection of the brain-homing breast cancer cell line MDA-MB231-BR. Patients with small cell lung cancer underwent quarterly MRI for 1 year. MTR and ADC were measured in regions of metastasis and matched contralateral tissue at the final time point and in registered regions at earlier time points. Texture analysis and linear discriminant analysis were performed to detect metastasis-containing slices. Results: Compared with contralateral tissue, mouse metastases had significantly lower MTR and higher ADC at the final time point. Some lesions were visible at earlier time points on the MTR and ADC maps: 24% of these were not visible on corresponding T2-weighted images. Texture analysis using the MTR maps showed 100% specificity and 98% sensitivity for metastasis at the final time point, with 77% sensitivity 2–4 d earlier and 46% 5–8 d earlier. Only 2 of 16 patients developed metastases, and their penultimate scans were normal. Conclusions: Some brain metastases may be detected earlier on MTR than conventional T2; however, the small gain is unlikely to justify “predictive” MRI. Magn Reson Med 77:1987–1995, 2017.

Original languageEnglish
Pages (from-to)1987-1995
Number of pages9
JournalMagnetic Resonance in Medicine
Volume77
Issue number5
DOIs
Publication statusPublished - May 2017
Externally publishedYes

Keywords

  • brain metastasis
  • cancer
  • diffusion
  • magnetization transfer
  • MRI
  • texture analysis

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