1. A system comprising: a chassis defining a bore; a main magnet to generate a polarizing magnetic field within the bore; a gradient system to apply a gradient magnetic field to the polarizing magnetic field; a radio frequency system to apply an RF pulse to patient tissue disposed within the bore and to receive signals from the patient tissue; and a computing system to receive the signals from the RF system, the computing system to execute program code to: control the gradient system and the radio frequency system to generate a first imaging sequence comprising first balanced gradient pulse trains and RF pulses, where phases of successive RF pulses in the first imaging sequence differ by a first pulse phase increment, to detect first signals emitted from the patient tissue in response to the first imaging sequence, and to generate a first image based on the first signals; control the gradient system and the radio frequency system to generate a second imaging sequence comprising second balanced gradient pulse trains and RF pulses, where phases of successive RF pulses in the second imaging sequence differ by a second pulse phase increment different from the first pulse phase increment, to detect second signals emitted from the patient tissue in response to the second imaging sequence, and to generate a second image based on the second signals; apply motion-correction processing to the first image to generate a first motion-corrected image; apply motion-correction processing to the second image to generate a second motion-corrected image; and generate a composite image based on the first motion-corrected image and the second motion-corrected image.