| 摘要 |
In a method and a reconstruction device for reconstructing an image from MR raw data acquired with multiple coils and entered at sample points on a grid in k-space, the sample points are arranged on data entry trajectories, respectively, along one-dimensional edges in an equidistant grid dimension characteristic for the respective edge. If raw data were acquired at all sample points, k-space would be sufficiently scanned, but the raw data are entered only on a portion of the sample points so that sufficient scanning exists only in an internal region of k-space, with undersampling existing in an external region of k-space. Reconstruction of the missing raw data is performed by reconstructing raw data for a specific coil for the non-sampled sample points in the internal region using the raw data acquired with that coil for other sample points in the internal region, without using raw data acquired with other coils, and for the non-sampled sample points in the external region, using the raw data acquired for the internal region, as well as reconstructed raw data, and using raw data acquired with different coils. |
| 主权项 |
1. A method for reconstructing raw data, acquired from an object with a magnetic resonance apparatus, comprising:
providing raw data to a computer, said raw data having been acquired with multiple magnetic resonance coils and, via said computer, entering said raw data into an electronic memory, organized as k-space, along trajectories comprised of respective sample points of a grid, and defining said grid such that, when raw data are entered at all sample points, k-space would be completely scanned, and varying said trajectories when entering said raw data to cause said raw data to be entered at sample points respectively along one-dimensional edges having equidistant grid dimensions that are characteristic for the respective edge; entering the raw data into said memory only at a portion of said sample points, and thereby causing Nyquist-sufficient scanning to exist only in an internal region of k-space and causing Nyquist undersampling to exist in an external region of k-space, thereby causing raw data to be missing at sample points in k-space that were not filled with said raw data; in said computer, for each of said multiple magnetic resonance coils, reconstructing the missing raw data in said internal region using raw data acquired with the respective magnetic resonance coil and entered at other sample points in said internal region, without using raw data acquired from others of said multiple magnetic resonance coils, and reconstructing raw data in said external region using the raw data acquired for the respective magnetic resonance coil and entered in the internal region and the reconstructed raw data from the internal region for the respective magnetic resonance coil, and using raw data acquired from magnetic resonance coils among said multiple magnetic resonance coils other than said respective magnetic resonance coil; and from said computer, making the raw data reconstructed from said missing raw data available in electronic form, in a data file together with the other raw data entered into k-space, in a form suitable for further processing of said data file to reconstruct an image of said object. |
