Figure 2

The 64 mT MRI scanner (Hyperfine, Guilford, CT) with retractable 0.5 mT field line extended above the unit. (b) A close-up image showing an array of samples arranged within a water-filled phantom and situated within the head coil for imaging. (c) A T1-weighted fast spin echo image showing a cross section of the phantom, containing a series of 8.5 nm SPION samples (TI = 900 ms, TE = 5.96 ms).