Apparatus and method for improving balanced steady-state free precision in magnetic resonance imaging
US10151814B2 · kind B2 · utility
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Inventors
Key dates
| Filing date | Apr 20, 2016 |
| Grant date | Dec 11, 2018 |
| Priority date | — |
| Expiry date | Sep 2, 2036 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01R33/56563
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A method for improving image homogeneity of image data acquired from balanced Steady-State Free Precision (bSSFP) sequences in magnetic resonance imaging. Multiple bSSFP sequences are performed with different radio frequency phase increments to create multiple bSSFP image volumes with different phase offsets ϕ. Each image has voxels whose intensity M is a function of a nuclear resonance signal (or magnetization) measured by the MR imaging apparatus. Per-voxel fitting of a mathematical signal model onto the measured magnetization of the field of view in function of the phase offsets Φ. Then the spin density M0, the relaxation time ratio Λ and the local phase offset ΔΦ are determined from the fit for each voxel. A homogeneous image of the object is generated by calculating the signal intensity in each voxel, using the spin density M0 and the relaxation time ratio Λ, wherein ΔΦ is chosen such that Φ−ΔΦ=0°.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.