US 12,135,362 B2
B0 field inhomogeneity estimation using internal phase maps from long single echo time MRI acquisition
Guillaume Daval-Frerot, Sainte-Geneviève-des-Bois (FR); Aurelien Massire, Palaiseau (FR); Mathilde Ripart, Seraincourt (FR); Boris Mailhe, Plainsboro, NJ (US); Mariappan S. Nadar, Plainsboro, NJ (US); Alexandre Vignaud, Paris (FR); and Philippe Ciuciu, Longpont-sur-Orge (FR)
Assigned to Siemens Healthineers AG, Forchheim (DE); and Commissariat a l Energie Atomique et aux Energies Alternatives, Paris (FR)
Filed by Siemens Healthineers AG, Forchheim (DE); and Commissariat a l Energie Atomique et aux Energies Alternatives, Paris (FR)
Filed on Apr. 30, 2021, as Appl. No. 17/245,993.
Claims priority of provisional application 63/124,911, filed on Dec. 14, 2020.
Prior Publication US 2022/0189081 A1, Jun. 16, 2022
Int. Cl. G01R 33/48 (2006.01); G01R 33/24 (2006.01); G01R 33/44 (2006.01); G01R 33/56 (2006.01); G01R 33/565 (2006.01)
CPC G01R 33/4824 (2013.01) [G01R 33/243 (2013.01); G01R 33/445 (2013.01); G01R 33/5608 (2013.01); G01R 33/56563 (2013.01)] 19 Claims
OG exemplary drawing
 
1. A method for creating a magnetic resonance (MR) image from MR data, the method comprising:
receiving, by a processor, the MR data;
applying, by the processor, a transform to the MR data, wherein a result of the applying is an image space representation of the MR data;
applying, by the processor, a virtual coil combination method to the image space representation of the MR data,
determining, by the processor, a wrapped phase map of the image space representation of the MR data, wherein the wrapped phase map is determined based on the virtual coil combination method applied to the image space representation of the MR data;
obtaining, by the processor, an unwrapped phase map based on the wrapped phase map;
scaling, by the processor, the unwrapped phase map into a B0 field map, the scaling based on only the influence of B0 field inhomogeneities on phases in the MR data;
reconstructing, by the processor, the MR image based on the MR data;
correcting, by the processor, the MR image based on the B0 field map; and
outputting, by the processor, the MR image.