Figure 3. Images of small phantoms obtained simultaneously with PET and MR. PET images were acquired with ¹⁸F in 15 min (total counts 300k, activity in phantom 10 MBq). MR images were acquired on a 4.7T, 30 cm bore system in 15 min (spin echo, TE 30 ms, TR 2000 ms). For the hot-spot phantom—spot diameter 2 mm, spot separation 6 mm. The spatial resolution of the PET scanner is about 2 mm FWHM.