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MR SAFETY-STATIC MAGNETIC FIELD

Physics

MR SAFETY-STATIC MAGNETIC FIELD

1. A voltage could be induced in flowing blood if the static magnetic field is very large.

2. The MHRA (Medicines and Healthcare products Regulatory Agency) have provided guidance on the safety of the main magnetic field:
- Pregnant patients should never be exposed to > 2.5 T
- No patient should be exposed to > 4 T
- If a patient is exposed to > 2.5 T they must have a panic button and be in constant visual contact.
- Over 24 hours, the average staff exposure should be < 0.2 T.
- Patients with a pacemaker should not be exposed to > 0.5 mT (note millitesla).


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REFERENCES

1. Bushberg, J. T. (2012). The essential physics of medical imaging. Philadelphia: Wolters Kluwer Health/Lippincott Williams & Wilkins. Find it at Amazon
2. Heggie, J. C., Liddell, N. A., & Maher, K. P. (1997). Applied imaging technology. Melbourne: St. Vincents Hospital.

Ⓒ A. Manickam 2018

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