Method for calculating signal-to-noise ratio in parallel acquisition image reconstruction
First Claim
1. A method for calculating a signal-to-noise ratio of a parallel-acquired image of an object in a parallel acquisition image reconstruction, comprising:
- acquiring the parallel-acquired image by a MRI device;
determining a reconstruction expression for a linear operation of the image reconstruction, ρ
=Mr, wherein ρ
is a reconstructed image of the parallel-acquired image, M is the reconstruction expression, and r is raw data of the parallel-acquired image by an image processing unit;
determining a weighted coefficient of the image reconstruction according to the reconstruction expression by the image processing unit; and
calculating the signal-to-noise ratio of the parallel-acquired image according to the weighted coefficient and the raw data by the image processing unit,wherein the raw data comprises a uniform under-sampling data in K-space, orwherein the raw data comprises a mixed sampling data by combining the uniform under-sampling data and low frequency full-sampling data in the K-space.
3 Assignments
0 Petitions
Accused Products
Abstract
The invention discloses a method for calculating the signal-to-noise ratio (SNR) in parallel acquisition image reconstruction, comprising: determining a reconstruction expression for a linear operation of the image reconstruction; determining a weighted coefficient according to the reconstruction expression; calculating the SNR according to the weighted coefficient and the raw data. The SNR not only is relevant to the geometric shape and position of the coils, but also is influenced by the reconstruction method and the sampling mode. The SNR is calculated based on contribution of the raw data at positions in the reading direction from all the phase-coding lines in all acquisition channels. It reflects more precisely the loss of the SNR in the parallel acquisition image reconstruction, especially the changes in the SNR caused by the number of the reference lines combined during the reconstruction.
5 Citations
15 Claims
-
1. A method for calculating a signal-to-noise ratio of a parallel-acquired image of an object in a parallel acquisition image reconstruction, comprising:
-
acquiring the parallel-acquired image by a MRI device; determining a reconstruction expression for a linear operation of the image reconstruction, ρ
=Mr, wherein ρ
is a reconstructed image of the parallel-acquired image, M is the reconstruction expression, and r is raw data of the parallel-acquired image by an image processing unit;determining a weighted coefficient of the image reconstruction according to the reconstruction expression by the image processing unit; and calculating the signal-to-noise ratio of the parallel-acquired image according to the weighted coefficient and the raw data by the image processing unit, wherein the raw data comprises a uniform under-sampling data in K-space, or wherein the raw data comprises a mixed sampling data by combining the uniform under-sampling data and low frequency full-sampling data in the K-space. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
-
Specification