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Prospective Synchronization
 
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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
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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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
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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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:
Guidelines for the Management of Patients with Heart Valve Prostheses and Annuloplasty Rings Referred for MRI Procedures
Tuesday, 1 January 2019   by www.ismrm.org    
Codman Neuro develops new MRI-resistant programmable valve for treatment of hydrocephalus
Tuesday, 22 September 2015   by www.news-medical.net    
Proton
 
A positively charged particle located in the nucleus of an atom. The number of protons in the nucleus governs the chemical properties of that element.
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Proton Density
 
The concentration of mobile Hydrogen atoms within a sample of tissue.

See also Hydrogen Density.
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Further Reading:
  Basics:
Magnetic resonance imaging
   by www.scholarpedia.org    
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 [last update: 2024-02-26 03:41:00]