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MR Compatibility

MRI Safety Guidance
If a device is to be labeled MR Safe, the following information should be provided:
Data demonstrating that when the device is introduced or used in the MRI environment (i.e. the MRI scan room) it does not pose an increased safety risk to the patient or other personnel,
a scientifically-based rationale for why data are not necessary to prove the safety of the device in the MR environment (for example, a passive device made entirely of a polymer known to be nonreactive in strong magnetic fields).
If a device is to be labeled MR Compatible, the following information should be provided:
Data demonstrating that when the device is introduced or used in the MRI environment, it is MR safe that it performs its intended function without performance degradation, and that it does not adversely affect the function of the MRI scanner (e.g. no significant image artifacts or noise). Any image artifact or noise due to the medical device should be quantified (e.g., % volume affected, signal to noise ratio),
a scientifically-based rationale for why data are not necessary to prove the compatibility of the device in the MRI environment.
Test Conditions:
The static magnetic field strength (Gauss (G) or Tesla (T)) to which the device was tested and demonstrated to be MRI 'safe', 'compatible', or 'intended for use in' should be related to typical machine ratings (e.g. 0.5 T, 1.5 T, 2.0 T, and shielded or unshielded magnet, etc).
The same conditions should be used for the spatial gradient (field strength per unit distance (i.e., G/cm)) in which the device was tested and demonstrated to be 'safe', 'compatible', or 'intended for use in'.
Also the RF transmitter power used during testing of the device, should be related to this typical machine ratings.
• For this and other aspects of MRI safety see our InfoSheet about MRI Safety.
• Patient-related information is collected in our MRI Patient Information.

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• View the NEWS results for 'MR Compatibility' (2).Open this link in a new window.
Further Reading:
Newer Heart Devices Safe During MRI
Monday, 23 August 2004   by    
  News & More:
Boston Scientific and Biophan in MRI Collaboration
Friday, 21 November 2003   by    
MRI safety targeted as new group offers credentialing test
Monday, 12 January 2015   by    
FDA Releases New Guidance On Establishing Safety, Compatibility Of Passive Implants In MR Environments
Tuesday, 16 December 2014   by    
MRI Safety Resources 
Safety Products - Safety pool - Nerve Stimulator - Safety Training - Implant and Prosthesis pool
MR Guided InterventionsMRI Resource Directory:
 - MR Guided Interventions -
Possible MR guided interventions are breast MRI, liver and bone biopsies. Open MRI is advantageous to guide interventional procedures because this type of MRI scanner provides a better patient access.
Before the MRI guided biopsy is started, all the necessary precautions ensuring normal sterile and safe conditions for an intervention have to be performed. This includes the special safety issues concerning MRI surroundings and special equipment, like non-magnetic biopsy needles, localization tools (e.g. wires to mark lesions prior to surgery with breast MRI guidance) etc.
See also 5 Gauss Line, Contraindications, Low Field MRI, MR Compatibility, Magnetic Resonance Guided Focused Ultrasound and Computer Aided Detection.

• View the DATABASE results for 'MR Guided Interventions' (8).Open this link in a new window

Further Reading:
Bringing innovative technologies together
Monday, 18 November 2013   by    
NeuroArm Robot Promises to Revolutionise MRI-guided Neurosurgery
Wednesday, 7 November 2007   by    
Magnetic resonance imaging guided musculoskeletal interventions
at 0.23T
Physics of MRI Safety
  News & More:
Magnetic Resonance Image-Guided Focused Ultrasound System Market Volatile, But The Path Of Least Resistance Remains Higher
Tuesday, 24 January 2017   by    
FDA clears ViewRay's next-gen, MRI-guided radiation therapy device
Tuesday, 28 February 2017   by    
Siemens, U. of Twente Biopsy Robot Promises Greater Precision, Less Cost
Friday, 22 January 2016   by    
New MRI-Guided Catheter Shows Major Potential for Stroke Treatment
Tuesday, 29 December 2015   by    
Magnetic resonance-guided motorized transcranial ultrasound system for blood-brain barrier permeabilization along arbitrary trajectories in rodents
Thursday, 24 December 2015   by    
Polish study on MRI-ultrasound for targeted prostate biopsy wins CEM award
Tuesday, 12 November 2013   by    
C4 Imaging Announces FDA 510(k) Clearance of its Positive-Signal MRI Marker - Sirius™
Friday, 6 December 2013   by    
MRI Resources 
MRI Technician and Technologist Career - Blood Flow Imaging - Pathology - Services and Supplies - Health - Shoulder MRI
MRI SafetyMRI Resource Directory:
 - Safety -
There are different types of contraindications that would prevent a person from being examined with an MRI scanner. MRI systems use strong magnetic fields that attract any ferromagnetic objects with enormous force. Caused by the potential risk of heating, produced from the radio frequency pulses during the MRI procedure, metallic objects like wires, foreign bodies and other implants needs to be checked for compatibility. High field MRI requires particular safety precautions. In addition, any device or MRI equipment that enters the magnet room has to be MR compatible. MRI examinations are safe and harmless, if these MRI risks are observed and regulations are followed.

Safety concerns in magnetic resonance imaging include:
the magnetic field strength;
possible 'missile effects' caused by magnetic forces;
the potential for heating of body tissue due to the application of the radio frequency energy;
the effects on implanted active devices such as cardiac pacemakers or insulin pumps;
magnetic torque effects on indwelling metal (clips, etc.);
the audible acoustic noise;
danger due to cryogenic liquids;
the application of contrast medium;

MRI Safety Guidance
It is important to remember when working around a superconducting magnet that the magnetic field is always on. Under usual working conditions the field is never turned off. Attention must be paid to keep all ferromagnetic items at an adequate distance from the magnet. Ferromagnetic objects which came accidentally under the influence of these strong magnets can injure or kill individuals in or nearby the magnet, or can seriously damage every hardware, the magnet itself, the cooling system, etc.. See MRI resources Accidents.
The doors leading to a magnet room should be closed at all times except when entering or exiting the room. Every person working in or entering the magnet room or adjacent rooms with a magnetic field has to be instructed about the dangers. This should include the patient, intensive-care staff, and maintenance-, service- and cleaning personnel, etc..
The 5 Gauss limit defines the 'safe' level of static magnetic field exposure. The value of the absorbed dose is fixed by the authorities to avoid heating of the patient's tissue and is defined by the specific absorption rate. Leads or wires that are used in the magnet bore during imaging procedures, should not form large-radius wire loops. Leg-to-leg and leg-to-arm skin contact should be prevented in order to avoid the risk of burning due to the generation of high current loops if the legs or arms are allowed to touch. The patient's skin should not be in contact with the inner bore of the magnet.
The outflow from cryogens like liquid helium is improbable during normal operation and not a real danger for patients.
The safety of MRI contrast agents is tested in drug trials and they have a high compatibility with very few side effects. The variations of the side effects and possible contraindications are similar to X-ray contrast medium, but very rare. In general, an adverse reaction increases with the quantity of the MRI contrast medium and also with the osmolarity of the compound.
See also 5 Gauss Fringe Field, 5 Gauss Line, Cardiac Risks, Cardiac Stent, dB/dt, Legal Requirements, Low Field MRI, Magnetohydrodynamic Effect, MR Compatibility, MR Guided Interventions, Claustrophobia, MRI Risks and Shielding.
Radiology-tip.comRadiation Safety,  Ionizing Radiation
Radiology-tip.comUltrasound Safety,  Absorbed Dose

• View the DATABASE results for 'MRI Safety' (42).Open this link in a new window

• View the NEWS results for 'MRI Safety' (13).Open this link in a new window.
Further Reading:
MRI Safety
2001   by    
What MRI Sequences Produce the Highest Specific Absorption Rate (SAR), and Is There Something We Should Be Doing to Reduce the SAR During Standard Examinations?
Thursday, 16 April 2015   by    
Contrast Agents: Safety Profile
  News & More:
Implantable Infusion Pumps in the Magnetic Resonance (MR) Environment: FDA Safety Communication - Important Safety Precautions
Wednesday, 11 January 2017   by    
Newer Heart Devices Safe During MRI
Monday, 23 August 2004   by    
FDA Releases New Guidance On Establishing Safety, Compatibility Of Passive Implants In MR Environments
Tuesday, 16 December 2014   by    
Modern Implantable Heart Devices Safe For Use In MRI Scans
Wednesday, 16 March 2005   by    
Searchterm 'MR Compatibility' was also found in the following services: 
News  (1)  Resources  (3)  
Unshielded Electric Components
Unshielded electric components in the magnet room will excite RF noise artifacts (interference) in different variations. RF 'buzz' will be seen over a range of frequencies on the images. The artifact runs in frequency encoding direction.

Image Guidance
Take care to use only MR compatible (special shielded) devices.
See also MR Compatibility.
Further Reading:
Thursday, 16 February 2012   by    
  News & More:
Electrical Noise in Intraoperative Magnetic Resonance Imaging reveals the intricacies of human brain – integrated consciousness with connectors to chilled universe
Sunday, 18 January 2009   by    
MRI Resources 
Pregnancy - Raman Spectroscopy - Developers - Blood Flow Imaging - Pathology - Bioinformatics
Metal ArtifactInfoSheet: - Artifacts - 
Case Studies, 
Reduction Index, 
etc.MRI Resource Directory:
 - Artifacts -
Quick Overview

Artifact Information
NAME Metal, susceptibility
DESCRIPTION Signal dropout, bright spots
REASON Field inhomogeneity
HELP Remove the metal

Ferromagnetic metal will cause a magnetic field inhomogeneity, which in turn causes a local signal void, often accompanied by an area of high signal intensity, as well as a distortion of the image. They create their own magnetic field and dramatically alter precession frequencies of protons in the adjacent tissues. Tissues adjacent to ferromagnetic components become influenced by the induced magnetic field of the metal hardware rather than the parent field and, therefore, either fail to precess or do so at a different frequency and hence do not generate useful signal. Two components contribute to susceptibility artifact, induced magnetism in the ferromagnetic component itself and induced magnetism in protons adjacent to the component.
Artifacts from metal may have varied appearances on MRI scans due to different type of metal or configuration of the piece of metal. The biocompatibility of metallic alloys, stainless steel, cobalt chrome and titanium alloy is based on the presence of a constituent element within the alloy that has the ability to form an adherent oxide coating that is stable, chemically inert and hence biocompatible. In relation to imaging titanium alloys are less ferromagnetic than both cobalt and stainless steel, induce less susceptibility artifact and result in less marked image degradation.

Image Guidance
Remove the metal when possible or take a not so sensitive sequence (a SE or another sequence with a rephasing 180° pulse). See also Susceptibility Artifact.

• View the DATABASE results for 'Metal Artifact' (2).Open this link in a new window

Further Reading:
Metal-Induced Artifacts in MRI
Metal Artefact Reduction
Thursday, 9 June 2011   by    
MRI Resources 
Brain MRI - Online Books - Veterinary MRI - Mobile MRI - MRI Reimbursement - Software
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