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y of evidence is low. Further studies are warranted. In cases of head and neck cancer treated with intra-arterial chemotherapy, no objective indices are available for determining the distribution of anticancer drugs administered to multiple arteries. To establish such indices, noninvasive measurements of drug concentrations are required in the arterial perfusion area of each artery. In MRI, changes in 1/T (Δ1/T ) are correlated with the contrast agent concentration. We focused on these properties and investigated whether it is possible to estimate anticance