Encyclopedia of Clinical Neuropsychology

2018 Edition
| Editors: Jeffrey S. Kreutzer, John DeLuca, Bruce Caplan


  • Robin SekerakEmail author
  • Nathan D. Zasler
Reference work entry
DOI: https://doi.org/10.1007/978-3-319-57111-9_76


Nikola Tesla


The official SI (System International – International agreement to use MKS units) Unit of magnetic field strength is the tesla (T). Magnetic field “strength” describes the Magnetic Induction or Magnetic Flux Density: the number of lines of magnetic flux per unit area. The unit of magnetic flux is the weber (Wb); so 1 T = 1 Wb/m2 (or kg × s−2 × A−1), where 1 Weber represents m2 × kg × s−2 × A−1. A conventional unit of magnetic field strength is the Gauss (in cgs units). 1 Tesla (T) = 10,000 gauss. In mathematical equations, the Tesla is used to avoid confusion and errors due to the need for conversion factors. A typical MRI scanner has a field strength of 1.5–3.0 T. Greater field strength allows better resolution. In the USA, 8 T is the maximum magnetic field strength approved by the FDA for clinical use on humans at this time. 11.7 T is available for research purposes in humans and 21.1 T is available for small animal studies.


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References and Readings

  1. Fanet, H. (2014). Medical imaging based on magnetic fields and ultrasounds. New Jersey: Wiley.CrossRefGoogle Scholar
  2. Saba, L. (2016). Image principles, neck and the brain. Florida: CRC Press.CrossRefGoogle Scholar

Copyright information

© Springer International Publishing AG, part of Springer Nature 2018

Authors and Affiliations

  1. 1.Waikato District Health BoardHamiltonNew Zealand
  2. 2.Concussion Care Centre of Virginia, Ltd.RichmondUSA