Patent Document ID: 20070156044
Application ID: 11518036
Patent Status: 0

Claim One:
1. A method for producing an image of a subject positioned in a field of view (FOV) of a magnetic resonance imaging system, the steps comprising: a) acquiring with the MRI system a set of projection views of the subject positioned in the FOV using a pulse sequence with a motion sensitizing gradient directed along a first direction, the set of projection views forming a first undersampled image data set; b) acquiring with the MRI system a second set of projection views of the subject positioned in the FOV using the pulse sequence with a different motion sensitizing gradient directed along the first direction, the second set of projection views forming a second undersampled image data set; c) repeating steps a) and b) a plurality of times to acquire additional first and second sets of projection views, wherein the projection views in the additional sets of projection views are interleaved; d) producing a plurality of complex difference projection data sets by subtracting I and Q components in corresponding projection views in each of said first and second undersampled image data sets; e) reconstructing a plurality of undersampled complex difference images from the corresponding plurality of complex difference projection data sets; f) producing a plurality of I component projection data sets from the plurality of complex difference images; g) producing an I component composite image from projection data in a plurality of said I component projection data sets; h) producing a plurality of Q component projection data sets from the plurality of complex difference images; i) producing a Q component composite image from projection data in a plurality of said Q component projection data sets; j) reconstructing an I image from an I component projection data set by: j)i) backprojecting the projection views in the I component projection data set into the FOV and weighting the value backprojected into each I image pixel by the normalized value of the corresponding pixel in the I component composite image; and j)ii) summing the backprojected values for each I image pixel; k) reconstructing a Q image from a Q component projection data set by: k)i) backprojecting the projection views in the Q component projection data set into the FOV and weighting the value backprojected into each Q image pixel by the normalized value of the corresponding pixel in the Q component composite image; and k)ii) summing the backprojected values for each Q image pixel; and l) combining the reconstructed I image with the reconstructed Q image to form a complex difference image.