Patent ID: 11918335
Assignee: SHENZHEN INSTITUTES OF ADVANCED TECHNOLOGY
Field: Measurement (Instruments)
Classification: CPC A  G | IPC A  G

Claim 8:
9. A magnetic resonance imaging apparatus, comprising a processor and a non-transitory memory, wherein the processor is coupled to the non-transitory memory, the processor is configured to execute an instruction and work with the non-transitory memory cooperatively to perform operations of:
obtaining three-dimensional under-sampling data of a target object,
wherein the three-dimensional under-sampling data is collected based on a first three-dimensional magnetic resonance imaging sequence;
the first three-dimensional magnetic resonance imaging sequence has a first sinusoidal gradient field on a phase direction and a second sinusoidal gradient field on a layer selection direction;
a duration of the first sinusoidal gradient field and a duration of the second sinusoidal gradient field are within a duration of a reading platform of a reading gradient field, wherein the reading gradient field is applied on a reading direction;
a 0-order moment of the first sinusoidal gradient field and a 0-order moment of the second sinusoidal gradient field are 0; and
a phase difference between the first sinusoidal gradient field the second sinusoidal gradient field is π/2;

calculating and obtaining a three-dimensional point spread function based on the three-dimensional under-sampling data or two-dimensional mapping data of the target object, wherein the two-dimensional mapping data and the three-dimensional under-sampling data have a same field of view;
calculating and obtaining a sensitivity map of the target object based on data of the target object collected by three-dimensional complete sampling; and
performing image reconstruction to the three-dimensional under-sampling data based on the three-dimensional point spread function and the sensitivity map to obtain a reconstructed magnetic resonance image.