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Characterization of ferromagnetic or conductive properties of metallic foreign objects embedded within the human body with magnetic iron detector (MID): Screening patients for MRI.
- Source :
-
Magnetic resonance in medicine [Magn Reson Med] 2015 May; Vol. 73 (5), pp. 2030-7. Date of Electronic Publication: 2015 Mar 26. - Publication Year :
- 2015
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Abstract
- Purpose: A preliminary assessment of the MRI-compatibility of metallic object possibly embedded within the patient is required before conducting the MRI examination. The Magnetic Iron Detector (MID) is a highly sensitive susceptometer that uses a weak magnetic field to measure iron overload in the liver. MID might be used to perform a screening procedure for MRI by determining the ferromagnetic/conductive properties of embedded metallic objects.<br />Methods: The study was composed by: (i) definition of MID sensitivity threshold; (ii) application of MID in a procedure to characterize the ferromagnetic/conductive properties of metallic foreign objects in 958 patients scheduled for MID examination.<br />Results: The detection threshold for ferromagnetic objects was found to be the equivalent of a piece of wire of length 2 mm and gauge 0.8 mm(2) and, representing purely conductive objects, an aluminum sheet of area 2 × 2 cm(2) . Of 958 patients, 165 had foreign bodies of unknown nature. MID was able to detect those with ferromagnetic and/or conducting properties based on fluctuations in the magnetic and eddy current signals versus control.<br />Conclusion: The high sensitivity of MID makes it suitable for assessing the ferromagnetic/conductive properties of metallic foreign objects embedded within the body of patients scheduled for MRI.<br /> (© 2015 Wiley Periodicals, Inc.)
- Subjects :
- Adult
Aged
Contraindications
Female
Humans
Iron Overload diagnosis
Male
Middle Aged
Patient Safety
Sensitivity and Specificity
Foreign Bodies diagnosis
Iron
Magnetic Fields
Magnetic Resonance Imaging methods
Magnetometry instrumentation
Magnetometry methods
Magnets
Mass Screening
Metals
Prostheses and Implants
Subjects
Details
- Language :
- English
- ISSN :
- 1522-2594
- Volume :
- 73
- Issue :
- 5
- Database :
- MEDLINE
- Journal :
- Magnetic resonance in medicine
- Publication Type :
- Academic Journal
- Accession number :
- 25820253
- Full Text :
- https://doi.org/10.1002/mrm.25604