Important considerations in measurement of attractive force on metallic implants in MR imagers

N. J. Kagetsu, A. W. Litt

Research output: Contribution to journalArticlepeer-review

54 Scopus citations

Abstract

Almost all reported measurements of the attractive force exerted on metallic implants in magnetic fields of magnetic resonance imagers have been obtained at the portal. This study was done to determine whether the maximum force on an implant is at the portal. Horizontal attractive forces on needles were measured along the axis of the bore at various distances from the portal of a 0.3-T vertical-field magnet and 0.5- and 1.5-T solenoid magnets. Upward vertical forces along the top of the bore were also measured. The horizontal forces 40 cm in from the portals of the 0.5- and 1.5-T magnets were 70%-80% greater than the horizontal forces at the portal. The upward vertical force at the top of the 0.3-T magnet bore, 63 cm in from the portal, was 20 times the horizontal force at the portal and was twice the maximum force measured in the 0.5-T magnet. The maximum force was not at the portal.

Original languageEnglish
Pages (from-to)505-508
Number of pages4
JournalRadiology
Volume179
Issue number2
DOIs
StatePublished - 1991
Externally publishedYes

Keywords

  • Foreign bodies
  • Magnetic resonance (MR), physics
  • Magnetic resonance (MR), safety
  • Radiology and radiologists, iatrogenic injury

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