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.