Over decades, frequency-modulated (FM) pulses have gained popularity for their ability to overcome flip angle errors that arise from experimental imperfections (e.g., B1 and B0 inhomogeneity). Beyond this, their unique properties have been exploited to expand the experimental capabilities of MRI, including generating unique image contrasts and performing spatial encoding. The MRI contrasts are based rotating frame relaxations (T1rho and T2rho) that occur during the application of FM pulses when performing an adiabatic full-passage (AFP). Well-known MRI spatial-encoding methods are the SPEN techniques that exploit the temporal-dependence of spin flips using a frequency-swept pulse and a B0 gradient. Most recently, we have discovered yet another spatial-encoding approach that exploits a B1 gradient and the spatial dependence of spin evolution around the effective field of AFPs in a Carr-Purcell train. This method, called FREE (Frequency-modulated Rabi-Encoded Echoes), with its robust insensitivity to B1 and B0 inhomogeneities, promises to eliminate the need for B0 gradients conventionally used to encode in MRI. Our goal is to exploit FREE to enable a new class of MRI scanner that produces high quality images, with capability to produce all the required contrasts for research and clinical applications, without the costly B0 gradient hardware and infrastructure of standard MRI systems.