Noise analysis systems and methods

A system for noise analysis, comprising:

• at least one storage device including a set of instructions;
• and
• at least one processor in communication with the at least one storage device, wherein when executing the set of instructions, the at least one processor is configured to direct the system to perform operations including:
• obtaining a plurality of signals of a target object by using a magnetic resonance imaging (MRI) device to apply an MR pulse sequence to the target object;
• determining, based on the plurality of signals, a first value of a first signal representation and a second value of a second signal representation of the target object, wherein the first signal representation and the second signal representation are defined as reciprocal with respect to each other;
• determining a value of a noise parameter based on the first value of the first signal representation and the second value of the second signal representation;
• obtaining at least one noise reduction image by correcting at least one of the plurality of signals based on the noise parameter.

A non-transitory computer readable medium, comprising at least one set of instructions for noise analysis, wherein when executed by one or more processors of a computing device, the at least one set of instructions causes the computing device to perform a method, the method comprising:

• obtaining magnetic resonance (MR) data of a target object by using a magnetic resonance imaging (MRI) device to apply an MR pulse sequence to the target object;
• reconstructing a plurality of MR images of the target object based on the MR data;
• determining, based on the plurality of MR images, a first value of a first signal representation and a second value of a second signal representation of the target object, wherein the first signal representation and the second signal representation are defined as reciprocal with respect to each other;
• determining a noise parameter image based on the first value of the first signal representation and the second value of the second signal representation, wherein each pixel point in the noise parameter image corresponds to a physical point of the target object, and a pixel value of each pixel point is associated with a value of a noise parameter at its corresponding physical point;
• obtaining at least one noise reduction image by correcting at least one of the plurality of MR images based on the noise parameter image;
• and
• sending the at least one noise reduction image to a terminal for display.