Dynamic adaptation of a degree of signal compression for MRT image processing
An apparatus and a method for generating an image from N reception signal data sets of signals received by a plurality of coils of a magnetic resonance tomography appliance from a region of a body to be examined using an image processing computer are provided. The apparatus includes a degree-of-compression determining device. A ratio N/M of the number N of N reception signal data sets generated from the signals received by the plurality of coils to a smaller number M of mode data sets is defined taking account of a plurality of parameters. The plurality of parameters at least also represent system resources of the image processing computer. Using a compression computer, the N reception signal data sets are compressed into M mode data sets. After this, the M mode data sets are used by the image processing computer for generating the image of the region of the body.
1. A method for generating an image with N reception signal data sets generated based on signals received from a plurality of coils of a magnetic resonance tomography appliance from a region of a body to be examined using an image processing computer, the method comprising:
defining, using a degree-of-compression determining device, a ratio N/M of a number N of the N reception signal data sets generated from the signals received by the plurality of coils to a smaller number M of mode data sets taking account of a plurality of parameters, the plurality of parameters at least also representing system resources of the image processing computer, wherein a parameter of the plurality of parameters comprises a required image reconstruction time received as input of a user of a magnetic resonance tomography (MRT) device and maximally accepted by the user;
compressing, using a compression computer, the N reception signal data sets into the M mode data sets; and
generating, using the image processing computer, an image of the region of the body using the M mode data sets.
2. The method of claim 1 , wherein an additional parameter of the plurality of parameters comprises a memory of the image processing computer that is available for an image reconstruction.
3. The method of claim 1 , wherein an additional parameter of the plurality of parameters comprises computing power or processor power of at least one processor of the image processing computer that is available for an image reconstruction.
4. The method of claim 1 , wherein an additional parameter of the plurality of parameters comprises an expected image reconstruction time required for image reconstruction using the image processing computer.
5. The method of claim 1 , wherein an additional parameter of the plurality of parameters comprises a permissible signal-to-noise ratio loss as a result of the image generation.
6. The method of claim 1 , further comprising an estimated expected image reconstruction time required for image reconstruction using the image processing computer before the ratio N/M is defined.
7. The method of claim 1 , wherein the generating comprises utilizing system resources of the image processing computer to a predetermined extent or percentage proportion.
8. The method of claim 7 , wherein the system resources comprise processor power of the image processing computer that is available for an image reconstruction, memory of the image processing computer that is available for the image reconstruction, or a combination thereof.
9. The method of claim 1 , wherein the M mode data sets are in each case further processing channels, principal components, k-space data sets, or a combination thereof.
10. The method of claim 1 , wherein the method is performed based on a partial parallel acquisition.
11. The method of claim 1 , further comprising performing, using a reduction matrix and a matrix multiplication, a compression of reception signal data sets generated by N coils of a magnetic resonance tomography (MRT) local coil array to the M mode data sets usable for a subsequent MRT image reconstruction, wherein M is less than N.
12. The method of claim 11 , wherein the reduction matrix is an eigenvector matrix.
13. The method of claim 12 , wherein the reduction matrix is an eigenvector matrix for a PCA-based compression method.
14. The method of claim 1 , wherein the M mode data sets are principal component data sets.
15. The method of claim 14 , wherein the principal components data sets are of a principal component analysis.
16. An apparatus for generating an image with signals received by coils of a magnetic resonance tomography appliance, the apparatus comprising:
N coils configured for receiving signals from a region of a body to be examined, N reception signal data sets being generatable from the received signals;
a degree-of-compression determining device configured to define a ratio N/M of a number N of reception signal data sets to a smaller number M of mode data sets to be processed further taking account of a plurality of parameters, the plurality of parameters at least also representing system resources of an image processing computer, wherein a parameter of the plurality of parameters comprises a required image reconstruction time received as input of a user of a magnetic resonance tomography (MRT) device and maximally accepted by the user;
a compression computer configured to generate the M mode data sets from the reception signal data sets from the N coils; and
an image processing computer configured for generating the image of the region of the body from the mode data sets.
17. The apparatus of claim 16 , wherein an additional parameter of the plurality of parameters comprises a memory of the image processing computer that is available for an image reconstruction.
18. The apparatus of claim 16 , wherein an additional parameter of the plurality of parameters comprises computing power or processor power of a processor of the image processing computer that is available for an image reconstruction.
19. The apparatus of claim 16 , wherein an additional parameter of the plurality of parameters comprises an expected image reconstruction time required for image reconstruction using the image processing computer.
20. The apparatus of claim 16 , wherein an additional parameter of the plurality of parameters is a permissible signal-to-noise ratio loss as a result of the image generation.
21. The apparatus of claim 16 , wherein the system resources of the image processing computer are useable to a predetermined extent or proportion for generating the image of the region of the body.
22. The apparatus of claim 21 , wherein the system resources comprises processor power of the image processing computer that is available for an image reconstruction, memory of the image processing computer that is available for the image reconstruction, or a combination thereof.
23. The apparatus of claim 16 , wherein the M modes are in each case further processing channels, principal components, k-space data sets, or a combination thereof.
24. The apparatus of claim 16 , wherein the apparatus is configured for partial parallel acquisition.
25. The apparatus of claim 16 , further comprising a reduction matrix configured for a compression, by matrix multiplications, of N reception signal data sets generated by the N coils of a magnetic resonance tomography (MRT) local coil array to the M mode data sets usable for a subsequent MRT image reconstruction, and wherein M is less than N.
26. The apparatus of claim 25 , wherein the reduction matrix is an eigenvector matrix.
27. The apparatus of claim 26 , wherein the reduction matrix is for a PCA-based compression.
28. The apparatus of claim 16 , wherein the M mode data sets are principal component data sets.
29. The apparatus of claim 28 , wherein the M mode data sets are component data sets for principal components of a PCA or principal component analysis.