Changes in apparent diffusion coefficient and T2 relaxation during radiotherapy for prostate cancer |
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| Authors: | Warren D. Foltz PhD Andy Wu BSc Peter Chung MD Charles Catton MD Andrew Bayley MD Michael Milosevic MD Robert Bristow MD Padraig Warde MD Anna Simeonov MSc David A. Jaffray PhD Masoom A. Haider MD Cynthia Ménard MD |
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| Affiliation: | 1. Radiation Medicine Program, Princess Margaret Hospital, and Department of Radiation Oncology, University of Toronto, Toronto, Canada;2. Joint Department of Medical Imaging, Princess Margaret Hospital, University of Toronto, Toronto, Canada |
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| Abstract: | Purpose: To evaluate regional and temporal changes in apparent diffusion coefficient (ADC) and T2 relaxation during radiation therapy (RT) in patients with low and intermediate risk localized prostate cancer. Materials and Methods: Seventeen patients enrolled on a prospective clinical trial where MRI was acquired every 2 weeks throughout eight weeks of image‐guided prostate IMRT (78 Gy/39 fractions). ADC and T2 quantification used entire prostate, central gland, benign peripheral zone, and tumor‐dense regions‐of‐interest, and mean values were evaluated for common response trends. Results: Overall, the RT responses were greater than volunteer measurement repeatability, and week 6 appeared to be an optimum time‐point for early detection. RT effects on the entire prostate were best detected using ADC (5–7% by week 2, P < 0.0125), effects on peripheral zone were best detected using T2 (19% reduction at week 6; P = 0.004) and effects on tumors were best detected using ADC (14% elevation at week 6; P = 0.004). Conclusion: ADC and T2 may be candidate biomarkers of early response to RT warranting further investigation against clinical outcomes. J. Magn. Reson. Imaging 2013;37:909–916. © 2012 Wiley Periodicals, Inc. |
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| Keywords: | prostate cancer radiation therapy T2 ADC treatment response |
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