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A new 17O‐labeled blood contrast agent was injected intravenously in control dogs. Electrocardiogram (ECG)‐triggered myocardial T1ρ imaging was performed to obtain spin‐locking T1ρ‐weighted myocardial signals for the detection of resultant metabolite H217O water in the heart. Bolus and slow injection methods of various doses of the 17O‐labeled and 16O‐labeled agents were carried out in order to evaluate...