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1. (WO2018065233) DIRECT MEASUREMENT OF THE B0-OFF-RESONANCE FIELD DURING MAGNETIC RESONANCE FINGERPRINTING

Pub. No.:    WO/2018/065233    International Application No.:    PCT/EP2017/073974
Publication Date: Fri Apr 13 01:59:59 CEST 2018 International Filing Date: Sat Sep 23 01:59:59 CEST 2017
IPC: G01R 33/24
G01R 33/44
G01R 33/56
G01R 33/50
Applicants: KONINKLIJKE PHILIPS N.V.
Inventors: MEINEKE, Jan, Jakob
AMTHOR, Thomas, Erik
KOKEN, Peter
SOMMER, Karsten
Title: DIRECT MEASUREMENT OF THE B0-OFF-RESONANCE FIELD DURING MAGNETIC RESONANCE FINGERPRINTING
Abstract:
The invention provides for a magnetic resonance imaging system (100). Machine executable instructions cause a processor controlling the MRI system to control (200) the magnetic resonance imaging system with the pulse sequence commands to acquire the magnetic resonance data. The pulse sequence commands are configured for controlling the magnetic resonance imaging system to acquire the magnetic resonance data according to a magnetic resonance fingerprinting protocol. The pulse sequence commands are configured for controlling the magnetic resonance imaging system to acquire the magnetic resonance data during multiple pulse repetitions (302). The pulse sequence commands are configured for controlling the magnetic resonance imaging system to cause gradient induced spin rephasing at least twice during each of the multiple pulse repetitions using a gradient magnetic field generating system (110, 112). The pulse sequence commands are configured for controlling the magnetic resonance imaging system to acquire at least two magnetic resonance signals during each of the multiple pulse repetitions. Each of the at least two magnetic resonance signals is measured during a separate one of the gradient induced spin rephasing. The magnetic resonance data comprises the at least two magnetic resonance signals acquired during each of the multiple pulse repetitions. Execution of the machine executable instructions further cause the processor to calculate (202) a B0-off-resonance map (158) using the magnetic resonance data, wherein the B0-off-resonance map is descriptive of a B0-off-resonance magnetic field of the magnetic resonance imaging system when the subject is within the imaging zone, wherein the B0-off-resonance map is at least partially calculated using at least two magnetic resonance signals measured during a single pulse repetition. Execution of the machine executable instructions further cause the processor to generate (204) at least one magnetic resonance parametric map by comparing the magnetic resonance data with a magnetic resonance fingerprinting dictionary (152).