A new method of non-uniform image correction is proposed. Image non-uniformity is originated from the spatial distribution of RF transmission and reception fields, represented as B 1 + and B 1 - , respectively. In our method, B 1 + mapping was performed in vivo by a phase method. In B 1 - mapping, images with multiple TEs were acquired with a multi-echo adiabatic spin echo (MASE) sequence which enables homogeneous excitation. By T 2 fitting of these images an M 0 map ( M 0 MASE ) was obtained, in which signal intensity was expressed as the product of B 1 - and M 0 ( 1 - e - TR / T 1 ) . The ratio of this M 0 MASE map to the B 1 + map showed a similar spatial pattern in different human brains. These ratios of M 0 MASE to B 1 + in 24 subjects were averaged and then fitted with a spatially polynomial function to obtain a ratio map of B 1 - / B 1 + ( α ) . Uniform image was achieved in spin echo (SE), MASE and inversion recovery turboFLASH (IRTF) images using measured B 1 + and calculated B 1 - by α B 1 + . Water fractions in gray and white matters obtained from the M 0 images corrected by this method were in good agreement with previously reported values. From these experimental results, the proposed method of non-uniformity correction is validated at 4.7 T imaging.