Evaluation of magnetic resonance safety of veterinary radiofrequency identification devices at 1 T.
← Research streamThree commercial veterinary microchips were evaluated at 1 T for translational force, torque, heating, artifact production, and function. Translation and torque were larger than expected from normal activity under normal gravity; no significant heating was ob…
Study snapshot
Abstract
Implants containing metallic components have the potential to become heated or move within the patient while in the magnetic resonance (MR) environment. Despite containing a ferromagnetic core and having been in use for over 20 years, no information is available on the safety of veterinary radiofrequency identification devices during MR examinations. These devices are the most commonly encountered metallic implants in dogs and cats undergoing MR imaging. Three commercial veterinary microchips were evaluated for safety in the MR environment at 1 T. Parameters tested were translational force, torque, heating, artifact production, and function. Translation and torque were larger than that expected from normal activity under normal gravity. No significant heating was observed. Signal void artifacts may affect diagnosis if they are too close to the area of clinical importance. Microchip function was unaffected by routine clinical MR imaging. Capsule formation around devices is a major factor in counteracting translation and torque. Our findings support that is acceptable for patients to undergo MR imaging with this 1 T system following an interval of 3 months postimplantation to allow capsule growth. Because of the complex interactions involved, these observations may not be translatable to MR scanners of different field strength and/or manufacturer. Further safety testing of these and other radiofrequency identification devices is therefore recommended at different field strengths and equipment specifications.
AI evidence extraction
Structured fields below were generated from the paper’s abstract and metadata to make the evidence easier to inspect. Automated extraction may be incomplete or incorrect; verify important details against the original paper.
Main findings
Three commercial veterinary microchips were evaluated at 1 T for translational force, torque, heating, artifact production, and function. Translation and torque were larger than expected from normal activity under normal gravity; no significant heating was observed; microchip function was unaffected by routine clinical MR imaging. Signal void artifacts could affect diagnosis if near the area of clinical importance, and the authors suggest MR imaging is acceptable on this 1 T system after 3 months postimplantation to allow capsule growth.
Outcomes measured
- translational force
- torque
- heating
- artifact production
- device function
Limitations
- Findings may not be translatable to MR scanners of different field strength and/or manufacturer
- Complex interactions in MR environment; further safety testing at different field strengths/equipment specifications recommended
View raw extracted JSON
{
"study_type": "other",
"exposure": {
"band": null,
"source": "veterinary radiofrequency identification devices (microchips) in MR environment",
"frequency_mhz": null,
"sar_wkg": null,
"duration": null
},
"population": "dogs and cats undergoing MR imaging (context); devices tested ex vivo/in MR environment",
"sample_size": 3,
"outcomes": [
"translational force",
"torque",
"heating",
"artifact production",
"device function"
],
"main_findings": "Three commercial veterinary microchips were evaluated at 1 T for translational force, torque, heating, artifact production, and function. Translation and torque were larger than expected from normal activity under normal gravity; no significant heating was observed; microchip function was unaffected by routine clinical MR imaging. Signal void artifacts could affect diagnosis if near the area of clinical importance, and the authors suggest MR imaging is acceptable on this 1 T system after 3 months postimplantation to allow capsule growth.",
"effect_direction": "mixed",
"limitations": [
"Findings may not be translatable to MR scanners of different field strength and/or manufacturer",
"Complex interactions in MR environment; further safety testing at different field strengths/equipment specifications recommended"
],
"evidence_strength": "low",
"confidence": 0.74,
"peer_reviewed_likely": "yes",
"keywords": [
"magnetic resonance",
"MRI safety",
"veterinary microchip",
"radiofrequency identification",
"implant heating",
"translational force",
"torque",
"artifact"
],
"suggested_hubs": [
{
"slug": "engineering",
"weight": 0.6,
"reason": "Bench/technical evaluation of implant behavior (force, torque, heating, artifacts) in an MR environment."
}
]
}AI-extracted fields are generated from the abstract and metadata and may be incomplete or incorrect. This material is for informational purposes and is not medical advice.
Identifiers and source
DOI: 10.1111/j.1740-8261.2010.01762.x
PubMed: 21388467
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