A magnetic resonance imaging system provided with a receiver, a transmitter, a gradient amplifier and a multiple RF coil composed of a plurality of element coils, the element coils electrically connected to the receiver, the magnetic resonance imaging system configured to use the multiple RF coil to perform parallel imaging for an object to be imaged with a planned field of view, hereinafter referred to as FOV, the system comprising: a host computer, said host computer being configured to, based on software procedures stored within a memory: execute a sensitivity-map scan for acquiring sensitivity map data of the element coils; provide an interface for an operator and receive via said interface a reduction rate for parallel imaging, the planned-FOV and an indication of a desired pulse sequence; determine an acquisition-FOV from the reduction rate and the planned-FOV, the acquisition-FOV being determined so as to be reduced from the planned-FOV in a phase-encode direction by a factor equal to the reduction rate; determine an unfolding-FOV, wherein the size in the phase-encode direction of the unfolding-FOV becomes larger than that of the planned-FOV, the upper limit of the ratio of the size of the unfolding-FOV to that of the acquisition-FOV being the number of element coils; instruct a sequencer of said magnetic resonance imaging system to perform a parallel imaging scan using said multiple RF coil and the acquisition-FOV, wherein said sequencer is electrically connected to control the operation of the gradient amplifier, the transmitter and the receiver; obtain an acquisition-FOV reconstructed image for each of the element coils; apply, on the basis of the unfolding-FOV, unfolding processing to the acquisition-FOV reconstructed images so that the acquisition-FOV reconstructed images are unfolded using an unfolding scale defined by the ratio of the size of the unfolding-FOV to that of the acquisition-FOV for the entirety of the acquisition-FOV reconstructed image and said sensitivity map data to provide an unfolding-FOV image, wherein the size of the unfolding-FOV image in the phase-encode direction is equal to the unfolding-FOV; and produce an image, the size of the image in the phase-encode direction equal to the planned-FOV from the unfolding-FOV image obtained by the unfolding processing. execute a sensitivity-map scan for acquiring sensitivity map data of the element coils; provide an interface for an operator and receive via said interface a reduction rate for parallel imaging, the planned-FOV and an indication of a desired pulse sequence; determine an acquisition-FOV from the reduction rate and the planned-FOV, the acquisition-FOV being determined so as to be reduced from the planned-FOV in a phase-encode direction by a factor equal to the reduction rate; determine an unfolding-FOV, wherein the size in the phase-encode direction of the unfolding-FOV becomes larger than that of the planned-FOV, the upper limit of the ratio of the size of the unfolding-FOV to that of the acquisition-FOV being the number of element coils; instruct a sequencer of said magnetic resonance imaging system to perform a parallel imaging scan using said multiple RF coil and the acquisition-FOV, wherein said sequencer is electrically connected to control the operation of the gradient amplifier, the transmitter and the receiver; obtain an acquisition-FOV reconstructed image for each of the element coils; apply, on the basis of the unfolding-FOV, unfolding processing to the acquisition-FOV reconstructed images so that the acquisition-FOV reconstructed images are unfolded using an unfolding scale defined by the ratio of the size of the unfolding-FOV to that of the acquisition-FOV for the entirety of the acquisition-FOV reconstructed image and said sensitivity map data to provide an unfolding-FOV image, wherein the size of the unfolding-FOV image in the phase-encode direction is equal to the unfolding-FOV; and produce an image, the size of the image in the phase-encode direction equal to the planned-FOV from the unfolding-FOV image obtained by the unfolding processing.