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Cochlear ImplantMRI Resource Directory:
 - Safety -
 

MRI Safety Guidance
Not necessarily a contraindication, but the examination may damage or impair it. Interference in electronic cochlear implants and ferromagnetic mechanical stapedial replacements has been reported.

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• For this and other aspects of MRI safety see our InfoSheet about MRI Safety.
• Patient-related information is collected in our MRI Patient Information.

 
Further Reading:
  Basics:
Pain, magnet displacement in MRI in patients with cochlear implants
Thursday, 20 November 2014   by medicalxpress.com    
Pediatric and Adult Cochlear Implantation1
2003   by radiographics.rsnajnls.org    
  News & More:
FDA Approves MED-EL's SYNCHRONY Cochlear Implant
Friday, 23 January 2015   by www.businesswire.com    
Hazards: Scanners Can Damage Hearing Implants
Wednesday, 10 December 2008   by www.nytimes.com    
FDA Approves PULSAR, SONATA, CONCERT
Thursday, 13 June 2013   by www.onlinetmd.com    
MRI Safety Resources 
Nerve Stimulator - Safety Products - Stent - Stimulator pool - Cochlear Implant
 
ContraindicationsForum -
related threadsMRI Resource Directory:
 - Safety -
 
The principal contraindications of the MRI procedure are mostly related to the presence of metallic implants in a patient. The risks of MRI scans increase with the used field strength. In general, implants are becoming increasingly MR safe and an individual evaluation is carried out for each case.


MRI Safety Guidance
Some patients should not be examined in MRI machines, or come closer than the 5 Gauss line to the system.
Absolute Contraindications for the MRI scan:
electronically, magnetically, and mechanically activated implants
ferromagnetic or electronically operated active devices like automatic cardioverter defibrillators
cardiac pacemakers
metallic splinters in the eye
ferromagnetic haemostatic clips in the central nervous system (CNS)
Patients with absolute contraindications should not be examined or only with special MRI safety precautions. Patients with an implanted cardiac pacemaker have been scanned on rare occasions, but pacemakers are generally considered an absolute contraindication. Relative contraindications may pose a relative hazard, and the type and location of an implant should be assessed prior to the MRI examination.
Relative Contraindications for the MRI scan:
cochlear implants
other pacemakers, e.g. for the carotid sinus
insulin pumps and nerve stimulators
lead wires or similar wires (MRI Safety risk)
prosthetic heart valves (in high fields, if dehiscence is suspected)
haemostatic clips (body)
non-ferromagnetic stapedial implants
Osteosynthesis material is usually anchored so well in the patients that no untoward effect will result. Another effect on metal parts in the patient's body is the heating of these parts through induction. In addition, image quality may be severely degraded. The presence of other metallic implants such as surgical clips etc. should be made known to the MRI operators. Most of these materials are non-magnetic, but if magnetic, they can pose a hazard.
See also MRI safety, Pregnancy, Claustrophobia and Tattoos.

Radiology-tip.comRadiation Safety,  As Low As Reasonably Achievable
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Further Reading:
  Basics:
MRI in Patients with Implanted Devices: Current Controversies
Monday, 1 August 2016   by www.acc.org    
Newer Heart Devices Safe During MRI
Monday, 23 August 2004   by www.hospimedica.com    
Physics of MRI Safety
   by www.aapm.org    
FDA Releases New Guidance On Establishing Safety, Compatibility Of Passive Implants In MR Environments
Tuesday, 16 December 2014   by www.meddeviceonline.com    
  News & More:
Making Pacemakers and ICDs MRI-Safe
Wednesday, 8 March 2017   by www.mddionline.com    
Implantable Infusion Pumps in the Magnetic Resonance (MR) Environment: FDA Safety Communication - Important Safety Precautions
Wednesday, 11 January 2017   by www.fda.gov    
Women with permanent make-up tattoos suffer horrific facial burns after going in for MRI scans - which create an electric current in the ink
Monday, 4 July 2016   by www.dailymail.co.uk    
Positive diagnosis for neural therapeutic implants
Tuesday, 19 April 2016   by medicalxpress.com    
Codman Neuro develops new MRI-resistant programmable valve for treatment of hydrocephalus
Tuesday, 22 September 2015   by www.news-medical.net    
MRI Resources 
Online Books - Sequences - Intraoperative MRI - Supplies - Case Studies - Pathology
 
Credit CardsMRI Resource Directory:
 - Safety -
 

MRI Safety Guidance
The magnetic memory of credit and similar cards, as well as magnetic devices such as tapes, will be erased by MR magnets.
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Foreign BodiesMRI Resource Directory:
 - MRI Accidents -
 

MRI Safety Guidance
Occult incorporated ferromagnetic foreign bodies are dangerous, in particular those close to the eyes. The patient's history may help because many patients do not remember such accidents. In case of doubt, X-rays should be taken prior to MR imaging.
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MRI Resources 
Services and Supplies - Journals - Jobs - Spine MRI - Resources - Used and Refurbished MRI Equipment
 
Helium
 
The element helium (He) was discovered 1868 when P.J.C. Janssen and N. Lockyer detected a new line in the solar spectrum during the solar eclipse. Lockyer and E. Frankland suggested the name helium (Gr. Helios, the sun) for the new element. In 1895, helium was discovered in the uranium mineral cleveite and in 1907 it was found out that alpha particles are helium nuclei.
Properties: Helium belongs to the noble gases, is colorless, odorless, and occurs in two naturally isotopes, helium 3 and helium 4. As an inert gas, helium does not react chemically largely and don't burns. Helium 4 makes up over 99% of naturally occurring helium atoms. Helium is extracted from natural gas e.g. present in various radioactive minerals as a decay product. Deposits and sources are in the USA, Poland, the USSR, and a few in India. The rare deposits and increased consumption lead to a shortage of this gas.
K. Onnes worked for many years to liquefy helium, which persisted as a gas to the lowest temperature. Helium does not freeze at atmospheric pressure. The density of helium vapor at his boiling point of 4.2 Kelvin is very high, with the vapor expanding greatly when heated to room temperature. Nb, Tc, Pb, La, V, and Ta are superconductors at liquid helium temperature. Liquid helium is commonly used as a cryogen for superconducting magnets. A rapid evaporation of the cryogen is named Quench. See also Quenching.


MRI Safety Guidance
Cryogenic liquids and their associated cold vapors can produce effects on the skin similar to a thermal burn and can cause frostbite. Prolonged breathing of extremely cold gases may damage the lungs and in absence of enough air or oxygen, asphyxiation and death can occur. Unprotected skin can stick to very cold metal (e.g. cooled by liquid helium) and then tear when pulled away.
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Further Reading:
  Basics:
Superfluid helium-4
Monday, 12 February 2018   by en.wikipedia.org    
Cryogenic Liquids and their Hazards
   by www.ccohs.ca    
Liquid Helium
   by hyperphysics.phy-astr.gsu.edu    
  News & More:
MR Solutions new pre clinical MRI scanners overcome helium shortage
Thursday, 20 June 2013   by www.heraldonline.com    
Tech firms, medical research threatened by helium shortage
Thursday, 19 September 2013   by www.livemint.com    
Cooling MRI magnets without a continuous supply of scarce helium
Tuesday, 13 August 2013   by www.wired.co.uk    
Helium shortage has wide impact Effects medical research, MRIs, party supplies
Wednesday, 15 August 2012   by www.niagarathisweek.com    
How 9/11 Made The Global Helium Shortage Worse
Thursday, 3 July 2014   by www.popsci.com    
MRI Resources 
Movies - MRA - Breast Implant - Cardiovascular Imaging - MRI Physics - MRI Centers
 
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