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Activator
 
Chemical, usually acetic acid in the fixer and sodium carbonate in the developer, to neutralize the developer and to swell the gelatin, respectively.
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Active Device
 
The term 'active' refers to any medical device that can only serve its intended use with the supply of power by any means including, but not limited to line, battery, or gas power. Examples of active devices include ventilators, pacemakers, and patient monitoring devices.
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Further Reading:
  News & More:
Modern Implantable Heart Devices Safe For Use In MRI Scans
Wednesday, 16 March 2005   by www.sciencedaily.com    
Newer Heart Devices Safe During MRI
Monday, 23 August 2004   by www.hospimedica.com    
MRI Resources 
Lung Imaging - Mobile MRI - Non-English - Quality Advice - Online Books - MRI Technician and Technologist Jobs
 
Active Shielding
 
Magnetic shielding through the use of secondary shielding coils designed to produce a magnetic field that cancels the field from primary coils in regions where it is not desired. These coils may be inside the magnet cryostat. Active shielding can be applied to the main magnet or to the gradient magnetic fields.
See also Magnetic Shielding, Self Shielding and Room Shielding.
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• View the DATABASE results for 'Active Shielding' (6).Open this link in a new window

 
Further Reading:
  Basics:
HEALTH AND SAFETY RISKS IN MAGNETIC SHIELDING DESIGN AND CONSTRUCTION FOR MAGNETIC RESONANCE IMAGING (MRI) SUITES(.pdf)
Thursday, 16 February 2012   by researchrepository.napier.ac.uk    
Dealing with Increased MRI Field Strength
Tuesday, 1 October 2013   by www.evaluationengineering.com    
Active Shimming
 
Shimming by suitably adjusting the currents in shim coils for qualitiy assurance.
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• View the DATABASE results for 'Active Shimming' (4).Open this link in a new window

 
Further Reading:
  Basics:
Second Order Shimming of High Field Magnets
   by www.healthcare.siemens.com    
Dealing with Increased MRI Field Strength
Tuesday, 1 October 2013   by www.evaluationengineering.com    
  News & More:
Improved shim method based on the minimization of the maximum off-resonance frequency for balanced SSFP
Monday, 1 June 2009   by www.ncbi.nlm.nih.gov    
Actively Shielded Magnet
 
See Active Shielding.
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• View the DATABASE results for 'Actively Shielded Magnet' (2).Open this link in a new window

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