US 12,105,168 B2
Operating an MRI apparatus
Stephan Biber, Erlangen (DE); Adrian Bampton, Abingdon (GB); Markus Vester, Nuremberg (DE); Andre de Oliveira, Uttenreuth (DE); Volker Model, Fürth (DE); Jürgen Nistler, Erlangen (DE); Andreas Potthast, Erlangen (DE); and Adam Paul Johnstone, Thame (GB)
Assigned to Siemens Healthineers AG, Forchheim (DE)
Filed by Siemens Healthcare GmbH, Erlangen (DE)
Filed on Aug. 5, 2022, as Appl. No. 17/882,526.
Application 17/386,533 is a division of application No. 16/546,296, filed on Aug. 20, 2019, granted, now 11,193,997.
Application 17/882,526 is a continuation of application No. 17/386,533, filed on Jul. 27, 2021, granted, now 11,550,009.
Prior Publication US 2022/0381860 A1, Dec. 1, 2022
Int. Cl. G01V 3/00 (2006.01); A61B 5/055 (2006.01); G01R 33/3815 (2006.01); G01R 33/44 (2006.01); G01R 33/36 (2006.01); G01R 33/54 (2006.01)
CPC G01R 33/3815 (2013.01) [A61B 5/055 (2013.01); G01R 33/446 (2013.01); G01R 33/3635 (2013.01); G01R 33/54 (2013.01)] 19 Claims
OG exemplary drawing
 
1. A method of operating a magnetic resonance imaging (MRI) apparatus, the method comprising:
identifying a center frequency during an imaging procedure and recording center frequencies of a magnet identified in successive imaging procedures;
identifying, by a processor, a number of decay-related characteristics of a main magnetic field of the MRI apparatus, the identifying of the number of decay-related characteristics of the main magnetic field comprising analyzing the center frequencies, the main magnetic field being a static B0 field; and
adapting a schedule for re-ramping the magnet based on a decay-related characteristic of the number of decay-related characteristics,
wherein analyzing the center frequencies comprises averaging a plurality of center frequencies measured during patient scans during a specified interval.