Fig. 4. Typical brain images from healthy adults produced by the low-cost and shielding-free 0.055 T MRI scanner.

Whole-brain axial, coronal and sagittal sections of the brain were acquired at two common contrasts, namely a T1-weighted (T1W) images using the 3D gradient-echo sequence and b T2W using 3D fast spin echo sequence. c Whole-brain axial sections acquired with fluid-attenuated inversion recovery (FLAIR) like contrast using the 3D FSE sequence with short TR. Scan times are 5.5 mins, 7.5 mins and 7.5 mins for T1W, T2W and FLAIR protocols, respectively. All images are displayed at a spatial resolution of 1 × 1 × 5 mm³, while the acquisition resolution is approximately 2 × 2 × 10 mm³. The axial (23 yrs. old; male) and coronal/sagittal (23 yrs. old; male) images shown here were acquired from two healthy adults, respectively.