Systems and methods for evaluating image quality

A method implemented on at least one machine each of which has at least one processor and at least one storage device for reconstructing a target cardiac image, the target cardiac image including a plurality of elements, each element of the plurality of elements being a pixel or voxel, the method comprising:

• obtaining projection data generated by an imaging device, the projection data including a plurality of sub-sets of projection data, each sub-set of projection data corresponding to a cardiac motion phase;
• obtaining a plurality of cardiac images corresponding to one or more cardiac motion phases based on the plurality of sub-sets of projection data corresponding to the one or more cardiac motion phases;
• determining a quality index for each cardiac image of the plurality of cardiac images;
• determining a phase of interest base on the plurality of quality indexes;
• and
• obtaining the target cardiac image of the phase of interest.

A system for reconstructing a target cardiac image, comprising:

• at least one storage device storing a set of instructions;
• and
• at least one processor in communication with the storage device, wherein when executing the set of instructions, the at least one processor is configured to cause the system to perform operations including:
• obtaining projection data generated by an imaging device, the projection data including a plurality of sub-sets of projection data, each sub-set of projection data corresponding to a cardiac motion phase;
• obtaining a plurality of cardiac images corresponding to one or more cardiac motion phases based on the plurality of sub-sets of projection data corresponding to the one or more cardiac motion phases;
• determining a quality index for each cardiac image of the plurality of cardiac images;
• determining a phase of interest base on the plurality of quality indexes;
• and
• obtaining the target cardiac image of the phase of interest.

A non-transitory computer readable medium storing instructions, the instructions, when executed by at least one processor, causing the at least one processor to implement a method comprising:

• obtaining projection data generated by an imaging device, the projection data including a plurality of sub-sets of projection data, each sub-set of projection data corresponding to a cardiac motion phase;
• obtaining a plurality of cardiac images corresponding to one or more cardiac motion phases based on the plurality of sub-sets of projection data corresponding to the one or more cardiac motion phases;
• determining a quality index for each cardiac image of the plurality of cardiac images;
• determining a phase of interest base on the plurality of quality indexes;
• and
• obtaining the target cardiac image of the phase of interest.