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 (RF) 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; control the gradient system and the radio frequency system to generate a third imaging sequence comprising third balanced gradient pulse trains and RF pulses, where phases of successive RF pulses in the third imaging sequence differ by a third pulse phase increment different from the first pulse phase increment and the second pulse phase increment, to detect third signals emitted from the patient tissue in response to the third imaging sequence, and to generate a third image based on the third 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; apply motion-correction processing to the third image to generate a third motion-corrected image; and generate a composite image based on the first motion-corrected image, the second motion-corrected image and the third motion-corrected image.