Frequency-encoded magnetic resonance imaging with dynamic radio frequency field gradients

Abstract Magnetic Resonance Imaging is the gold standard for soft tissue diagnostic imaging but relies on expensive, failure-prone, and loud magnetic field gradients for spatial encoding. Radiofrequency field gradients are a promising alternative, yet they have never achieved frequency encoding, the technique that allows an image to be acquired continuously in milliseconds and without which scan times would increase by orders of magnitude. Here we show that the Bloch-Siegert shift can apply a sp