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Abstract #5176

Soft-Tissue Sarcomas demonstrate Fractional Anisotropy in Diffusion Tensor Imaging and Fractional Anisotropy Values Change After Treatment

Imogen Thrussell1,2, Jessica Winfield1,2, Sadiq Usman2, Jennifer Newman2, Georgina Hopkinson2, Shane Zaidi1,2, Aisha Miah1,2, Christina Messiou1,2, and Matthew Blackledge1,2
1The Institute of Cancer Research, London, United Kingdom, 2The Royal Marsden NHS Foundation Trust, London, United Kingdom

Synopsis

Keywords: Diffusion/other diffusion imaging techniques, Diffusion Tensor Imaging, Cancer, Fractional Anisotropy, DWI, ADC

In previous studies average values of Apparent Diffusion Coefficient (ADC) have been shown to change significantly after radiotherapy in Soft-Tissue Sarcomas (STS). In this study we evaluate the Fractional Anisotropy (FA) of STS before and after treatment and demonstrate that (i) tumours can exhibit significant diffusion anisotropy, and (ii) changes in FA are inversely correlated with ADC change. Diffusion-Tensor Imaging (DTI) may therefore provide important microstructural information when interpreting change in STS after radiotherapy, and that diffusion anisotropy should be accounted for when optimising diffusion-weighted imaging (DWI) protocols for STS.

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