Water content, diffusion measures and FET-PET measured simultaneously on a hybrid 3T scanner in 40 brain tumour patients were investigated. Despite reasonable expectations of finding some microscopic-structure-driven correlations between these parameters, compared here for the first time, low correlations were found in healthy tissue. Interestingly, the correlation between water content and diffusion indices -while still rather low - increased in tumour tissue. Importantly, this implies that each parameter reflects different aspects and thus their combination should be more powerful for oncology than using single parameters
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