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PEDRI of the miltitube phantom shown in Fig.1. Images were acquired with a) 573.625 MHz and b) 573.950 MHz EPR irradiation frequency, respectively. The MRI acquisition parameters (using gradient echo pulse sequence) were: TR, 500 ms; TE, 40 ms; matrix, 64 × 64; field of view, 80 × 80 mm; slice thickness, 20 mm; Number of repetitions, 4; acquisition time, 129 s; NMR frequency, 856 kHz. EPR irradiation power, 1.25 W, irradiation time, 130 s.
