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Result : Searchterm 'Safety Guidance' found in 0 term [] and 27 definitions []
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ProsthesesMRI Resource Directory:
 - Safety -
 
Generally, joint and limb prostheses presents low MRI risks of heating and magnetic attraction, but image artifacts can be caused by them.


MRI Safety Guidance
If possible, prostheses should be removed prior to the MR examination. Risks are depending on the field strength, the used material, the shape and the length of prostheses. A material like titanium alloy is safely. The use of a low to mid field MRI device presents also a high safety.
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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.

MRI Safety Resources 
Claustrophobia - Cochlear Implant - Stimulator pool - Breast Implant - Implant and Prosthesis pool
 
Prosthetic Heart ValvesMRI Resource Directory:
 - Safety -
 
The interactions between the most tested heart valve prostheses and the magnetic field of MRI devices are of no significance. However, there are many different types of heart valve prostheses and in the particular case their MRI safety should be checked.
MRI Safety Guidance
Prosthetic heart valves, depending on the type and the material, are not necessarily considered to be dangerous in fields up to 3T. Patients should not undergo high field MRI examinations if valve dehiscence is clinically suspected.
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• View the DATABASE results for 'Prosthetic Heart Valves' (2).Open this link in a new window

 
Further Reading:
  Basics:
Prosthetic Heart Valves: Evaluation of Magnetic Field Interactions, Heating, and Artifacts at 1.5 T
2000   by www.imrser.org    
  News & More:
Codman Neuro develops new MRI-resistant programmable valve for treatment of hydrocephalus
Tuesday, 22 September 2015   by www.news-medical.net    
MRI Resources 
Absorption and Emission - Online Books - Jobs - Stent - Musculoskeletal and Joint MRI - Service and Support
 
Quench
 
Quenching is the cryogen boil off (liquid helium) which is used to cool the superconducting magnet coils of high field MRI systems. This results in a loss of superconductivity in the magnet, in a rapid increase in the resistivity of the magnet, which generates heat that results in further evaporation of the cryogen.


MRI Safety Guidance
A quench can cause total magnet failure and should be avoided.
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• View the DATABASE results for 'Quench' (5).Open this link in a new window

 
Further Reading:
  Basics:
Cryogenic Liquids and their Hazards
   by www.ccohs.ca    
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Skin Depth
 
Time-dependent electromagnetic fields are significantly attenuated by conducting media (including the human body); the skin depth gives a measure of the average depth of penetration of the RF field. A high power frequency tunable RF source can be rapidly switched on and off. This produces a large RF field perpendicular to the magnetic field. This RF field is focused by the body coil. The RF source and coils must be tunable in both frequency and impedance to 'match the impedance' of the patient's body.


MRI Safety Guidance
The skin depth may be a limiting factor in MR imaging at very high frequencies (high magnetic fields). The skin depth also affects the Q of the coils.
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Further Reading:
  News & More:
Magnetic resonance-guided motorized transcranial ultrasound system for blood-brain barrier permeabilization along arbitrary trajectories in rodents
Thursday, 24 December 2015   by www.ncbi.nlm.nih.gov    
MRI Resources 
Contrast Enhanced MRI - Safety Products - Quality Advice - Artifacts - Spectroscopy - Manufacturers
 
Skin PatchesMRI Resource Directory:
 - Safety -
 
Pharmaceutical products in transdermal skin patches may cause burns due to the absorption of RF energy.


MRI Safety Guidance
Such patches must be removed prior to MR examinations.
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MRI Resources 
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