Exam (elaborations)
MRI ARMRIT 2024 MRI Instrumentation Questions and Answers
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MRI ARMRIT 2024 MRI Instrumentation
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MRI ARMRIT 2024 MRI InstrumentationHow many MRI Magnets are there and what are they ? - answerThree types
Permanent
Resistive
Superconductive
What is a permanent magnet? - answerMade up of naturally ferromagnetic material
What is the field strength of a permanent magnet? - answer0-.03 Tesla
Homogeneity is good
What are the advantages of a permanent magnet? - answerNo fringe field
Low field strength range
No electrical power to maintain B0
No cryogen
What are the disadvantages of a permanent magnet? - answerLow field strength
Weight range
What is a Resistive magnet? - answerRequires constant current of electricity in
electromagnetic coils and maintain a B0
Operates at temperatures higher tan superconductive
What is the field strength of a resistive magnet? - answer0-0.6 Tesla
Homogeneity is Fair
Advantages of a resistive magnet? - answerEasy to construct
Low fringe field
Low field strength
Can be turned off when not performing MRI scans
Disadvantages of a resistive magnet? - answerSensitive to temperature fluctuations
Expensive electrical power cost to maintain B o and cooling system.
What is a Superconductive magnet? - answerA magnetic field that is produced by an
electrical current flowing near absolute zero.
When does the magnet becomes superconductive? - answer4 degrees Kelvin
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