Method of MR imaging of at least a portion of a body placed in the examination volume of a MR device , the method comprising the steps of: - subjecting the portion of the body to an imaging sequence of RF pulses and switched magnetic field gradients, which imaging sequence is a stimulated echo sequence including: i) two preparation RF pulses (α) radiated toward the portion of the body during a preparation period , and ii) one reading RF pulse (β) or a train of reading RF pulses (β) radiated toward the portion of the body during an acquisition period temporally subsequent to the preparation period , wherein the at least two preparation RF pulses (α) and one or more reading RF pulses (β) have a sequence timing so as to form one or more FID signals (I 1 ) and one or more stimulated echo signals (I 2 ); - acquiring one or more FID signals (I 1 ) and one or more stimulated echo signals (I 2 ) during the acquisition period ; the flip angle and the sequence timing of the reading RF pulses causing equal T 2 * weighting of the one or more FID signals (I 1 ) and the one or more stimulated echo signals (I 2 ) during the acquisition period ; - deriving a B 1 map indicating the spatial distribution of the RF field of the RF pulses within the portion of the body from the acquired FID (I 1 ) and stimulated echo (I 2 ) signals, wherein an MR image is reconstructed from the FID signals (I 1 ) and another MR image is reconstructed from the stimulated echo signals (I 2 ), wherein the B 1 map is derived from the voxel-wise intensity ratio of the two MR images. - subjecting the portion of the body to an imaging sequence of RF pulses and switched magnetic field gradients, which imaging sequence is a stimulated echo sequence including: i) two preparation RF pulses (α) radiated toward the portion of the body during a preparation period , and ii) one reading RF pulse (β) or a train of reading RF pulses (β) radiated toward the portion of the body during an acquisition period temporally subsequent to the preparation period , wherein the at least two preparation RF pulses (α) and one or more reading RF pulses (β) have a sequence timing so as to form one or more FID signals (I 1 ) and one or more stimulated echo signals (I 2 ); i) two preparation RF pulses (α) radiated toward the portion of the body during a preparation period , and ii) one reading RF pulse (β) or a train of reading RF pulses (β) radiated toward the portion of the body during an acquisition period temporally subsequent to the preparation period , wherein the at least two preparation RF pulses (α) and one or more reading RF pulses (β) have a sequence timing so as to form one or more FID signals (I 1 ) and one or more stimulated echo signals (I 2 ); - acquiring one or more FID signals (I 1 ) and one or more stimulated echo signals (I 2 ) during the acquisition period ; the flip angle and the sequence timing of the reading RF pulses causing equal T 2 * weighting of the one or more FID signals (I 1 ) and the one or more stimulated echo signals (I 2 ) during the acquisition period ; - deriving a B 1 map indicating the spatial distribution of the RF field of the RF pulses within the portion of the body from the acquired FID (I 1 ) and stimulated echo (I 2 ) signals, wherein an MR image is reconstructed from the FID signals (I 1 ) and another MR image is reconstructed from the stimulated echo signals (I 2 ), wherein the B 1 map is derived from the voxel-wise intensity ratio of the two MR images. <EOS>