| 摘要 |
In a magnetic resonance (MR) method and system for the generation of diffusion information, diffusion-weighted MR images of an examination subject are generated, each image being generated using an individual diffusion gradient. The diffusion gradients, and therefore the MR images, are sorted such that, after the sorting, a predefined number of diffusion gradients respectively forms a group. Each diffusion gradient belongs to at least one of these groups, and the diffusion gradients of the respective same group are all as linearly independent of one another as possible. The MR images whose diffusion gradients form a group are assembled into an MR result image. Spatial transformations between the MR result images are determined, and the MR images are modified using these spatial transformations. The diffusion information is formed with the aid of the modified MR images. |
| 主权项 |
1. A method to generate diffusion information representing diffusion of predetermined molecules in tissue of a subject, comprising:
operating a magnetic resonance data acquisition unit, in which a subject is located, to obtain a plurality of diffusion-weighted magnetic resonance images of the subject, with each of said diffusion-weighted magnetic resonance images being generated with a respective, individual diffusion gradient; in a computerized processor, sorting the diffusion gradients to produce, after sorting, respective groups of said diffusion gradients with a predetermined number of said diffusion gradients in each group and each of said diffusion gradients belonging to at least one of said groups, to place diffusion gradients in respective groups of at least two diffusion gradients per group that are, within the respective groups, as linearly independent of each other as possible by having an absolute value of a scalar product of the at least two diffusion gradients that is minimal; in said processor, for each of said groups, combining the respective magnetic resonance images that were generated using the respective diffusion gradients in the respective group to form, for each group, a magnetic resonance result image; in said processor, determining spatial transformations between respective magnetic resonance result images that represent movement of said subject that exists in the respective magnetic resonance result images for which the spatial transformation is determined; in said processor, using the respective spatial transformations between respective magnetic resonance result images to modify the respective magnetic resonance result images to account for said movement in bringing the respective magnetic resonance result images into registration with each other; in said processor, forming diffusion information based on the modified magnetic resonance result images; and at a display in communication with said processor, displaying said magnetic resonance images with said diffusion information embodied therein. |
