The perfusion effect on the signal attenuation may be significant at low b values (0–150 s/mm2) in well-vascularized tissues, while it is assumed to vanish at higher b values due to the larger drop in signal compared to the thermal diffusivity effect.
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Radiation-induced parotid changes in oropharyngeal cancer patients: the role of early functional imaging and patient-/treatment-related factors.
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