Magnetic resonance imaging apparatus, processing apparatus and medical image processing method

1. A magnetic resonance imaging apparatus comprising:

processing circuitry configured to:

generate reference k-space data by applying inverse transform of reconstruction processing to a reference image;

generate a plurality of reference partial k-space data items so as to respectively correspond to a plurality of partial k-space data items relating to a plurality of frames at different filling positions in a k-space and arranged in time sequence, based on the filling positions and the reference k-space data;

generate a plurality of difference k-space data items by taking differences between the partial k-space data items and the reference k-space data items to each of the frames;

generate a plurality of difference images by applying the reconstruction processing respectively to the difference k-space data items; and

generate a plurality of composite images by combining the reference image with each of the difference images.

2. The magnetic resonance imaging apparatus according to claim 1 , wherein the processing circuitry is further configured to generate the reference partial k-space data items by extracting k-space traces respectively corresponding to the filling positions from the reference k-space data.

3. The magnetic resonance imaging apparatus according to claim 1 , wherein the processing circuitry is further configured to generate the reference image by applying the reconstruction processing to the k-space data obtained by integrating all of the partial k-space data items.

4. The magnetic resonance imaging apparatus according to claim 1 , wherein the processing circuitry is further configured to generate the reference image by applying the reconstruction processing to the k-space data obtained by integrating two or more of the partial k-space data items.

5. The magnetic resonance imaging apparatus according to claim 1 , wherein the processing circuitry is further configured to generate the reference image by applying the reconstruction processing to the k-space data collected before collection of the partial k-space data items.

6. The magnetic resonance imaging apparatus according to claim 1 , wherein the processing circuitry is further configured to generate the reference image by applying the reconstruction processing to the k-space data collected after collection of the partial k-space data items.

7. The magnetic resonance imaging apparatus according to claim 1 , wherein the processing circuitry is further configured to generate the reference image by applying the reconstruction processing to the k-space data collected before or after an angiographic examination.

8. The magnetic resonance imaging apparatus according to claim 1 , wherein the processing circuitry is further configured to perform a radial scan and acquire the partial k-space data items.

9. The magnetic resonance imaging apparatus according to claim 1 , wherein the processing circuitry is further configured to perform a spiral scan and acquire the partial k-space data items.

10. The magnetic resonance imaging apparatus according to claim 1 , wherein the processing circuitry is further configured to perform a Cartesian scan and acquire the partial k-space data items.

11. The magnetic resonance imaging apparatus according to claim 1 , wherein the processing circuitry is further configured to generate the difference images by applying the reconstruction processing which introduced a correlation between the frames.

12. The magnetic resonance imaging apparatus according to claim 11 , wherein the correlation is compressed sensing.

13. The magnetic resonance imaging apparatus according to claim 1 , wherein the processing circuitry is further configured to generate the composite images by combining the reference image with each of the difference images.

14. A processing apparatus comprising:

processing circuitry configured to:

generate reference k-space data by applying inverse transform of reconstruction processing to a reference image;

generate a plurality of reference partial k-space data items so as to respectively correspond to a plurality of partial k-space data items relating to a plurality of frames at different filling positions in a k-space and arranged in time sequence, based on the filling positions and the reference k-space data;

generate a plurality of difference k-space data items by taking differences between the partial k-space data items and the reference k-space data items to each of the frames;

generate a plurality of difference images by applying the reconstruction processing respectively to the difference k-space data items; and

generate a plurality of composite images by combining the reference image with each of the difference images.

15. A medical image processing method comprising:

generating reference k-space data by applying inverse transform of reconstruction processing to a reference image;

generating a plurality of reference partial k-space data items so as to respectively correspond to a plurality of partial k-space data items relating to a plurality of frames at different filling positions in a k-space and arranged in time sequence, based on the filling positions and the reference k-space data;

generating a plurality of difference k-space data items by taking differences between the partial k-space data items and the reference k-space data items to each of the frames;

generating a plurality of difference images by applying the reconstruction processing respectively to the difference k-space data items; and

generating a plurality of composite images by combining the reference image with each of the difference images.