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Several PDA thresholding methods :
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HPt : hyperperfused voxels using a 1.75 fixed threshold
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hPg and HPg : hypoperfused and hyperfused voxels using a histogram-based Gaussian method
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DRg : diffusion-restricted method using a histogram based method
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HPg&DRg : HPg voxels with diffusion restrictioin
Khalifa et al, J NeuroOncol 2016
PWI : predictive value for sites of relapse