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Paper   IPM / Cognitive Sciences / 13958
School of Cognitive Sciences
  Title:   Torque and Translational Force Estimation for Ferromagnetic Objects: the Saturation Effect
1.  V. Ghodrati
2.  A. Nasiraei Moghaddam
  Status:   In Proceedings
  Proceeding: Proc. Intl. Soc. Mag. Reson. Med. 23 (2015)
  Year:  2015
  Supported by:  IPM
Translational force and torque that acts on the ferromagnetic object in the magnetic field depends on the shape and volume of object, magnetic field strength and spatial gradient of the static magnetic field1. Ferromagnetic objects in the MR-environment experienced linear magnetic region or saturation region. conventional approximation of the force and torque on the ferromagnetic ellipsoid of revolution are based on the linear magnetic region2. However, almost ferromagnetic objects placed in the saturation region in the commercial MR-scanners. Therefore, it is necessary to considered saturation region for these objects. Here, the approximated strength for the magnetic field that can be saturated the almost ferromagnetic objects will be presented. a simple simulation with Ansoft Maxwell 3D will be performed to show the Cast-Iron as a ferromagnetic object placed in the highly saturation region. Also, it will show that just by using the linear region, the approximation of force will be 1.5 times overestimated in comparison by considering of real states for these objects.

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