1. A method for rapid acquisition of MRI data at multiple points in time in an MRI scan using tailored signal excitation modules, said method comprising the steps of: (a) obtaining tailored signal excitation modules by using RF excitation pulses in combination with one or more magnetic field gradients; (b) acquiring an aliased k-space dataset at a point in time using a pulse sequence that employs said obtained tailored signal excitation modules, which tag and overlap distinct k-space points; (c) repeating steps (a) and (b) for acquiring aliased k-space datasets at multiple time points in a scan while tagging the overlapped k-space points as a function of time to obtain an accelerated k-t dataset; (d) undoing k-space aliasing in the acquired k-space datasets by Fourier transforming them along the time axis followed by a filtering process to separate the overlapped points; and (e) performing a Fourier transformation along one or more axes of the un-aliased k-space datasets to generate image frames for the different time points at which data was acquired.