Computation of Transmitted and Received$rm B1$Fields in Magnetic Resonance Imaging

Computation of B1 fields is a key issue for determination and correction of intensity nonuniformity in magnetic resonance images. This paper presents a new method for computing transmitted and received
$ B_1$
fields. Our method combines a modified MRI acquisition protocol and an estimation technique based on the Levenberg–Marquardt algorithm and spatial filtering. It enables accurate estimation of transmitted and received
$ B_1$
fields for both homogeneous and heterogeneous objects. The method is validated using numerical simulations and experimental data from phantom and human scans. The experimental results are in agreement with theoretical expectations.