US 12,245,848 B2
MR imaging for radiation therapy planning
Steffen Weiss, Hamburg (DE)
Assigned to Koninklijke Philips N.V., Eindhoven (NL)
Appl. No. 17/916,822
Filed by KONINKLIJKE PHILIPS N.V., Eindhoven (NL)
PCT Filed Apr. 1, 2021, PCT No. PCT/EP2021/058552
§ 371(c)(1), (2) Date Oct. 4, 2022,
PCT Pub. No. WO2021/204640, PCT Pub. Date Oct. 14, 2021.
Claims priority of application No. 20168130 (EP), filed on Apr. 6, 2020.
Prior Publication US 2023/0148894 A1, May 18, 2023
Int. Cl. A61B 5/055 (2006.01); G01R 33/44 (2006.01)
CPC A61B 5/055 (2013.01) [G01R 33/443 (2013.01); A61B 2576/00 (2013.01)] 19 Claims
OG exemplary drawing
 
1. A method of magnetic resonance (MR) imaging of a body of a patient positioned in an examination volume of an MR device, the method comprising:
acquiring first MR imaging data representative of at least one region of the body;
analyzing said first MR imaging data to delineate at least one anatomical structure within said at least one region of the body;
acquiring second MR imaging data of said at least one body region using a multi-point Dixon sequence;
deriving a BO map from said second MR imaging data;
analyzing said BO map to determine at least one low fidelity region of said BO map;
performing BO mapping to refine the BO map using a multi-acquisition gradient echo sequence, comprising a dual acquisition gradient echo sequence restricted to at least one region where said delineated anatomical structure and said low fidelity region overlap completely or partially; and
correcting geometrical distortions in said first and/or second MR imaging data using the refined BO map.