MRI ARMRIT 2025 MRI INSTRUMENTATION TEST
QUESTIONS AND ANSWERS
How many MRI Magnets exist and what are they ?
Three types
Permanent
Resistive
Superconductive
What is a permanent magnet?
Made of naturally ferromagnetic material
What is the field strength of a permanent magnet?
0-.03 Tesla
Good homogeneity
What are the advantages of a permanent magnet?
No fringe field
Low field strength range
No electrical power to maintain B0
No cryogen
What are the disadvantages of a permanent magnet?
Low field strength
Weight range
What is a Resistive magnet?
Requires continuous flow of electricity in electromagnetic coils and have a B0
Operates above tan superconductive
QUESTIONS AND ANSWERS
How many MRI Magnets exist and what are they ?
Three types
Permanent
Resistive
Superconductive
What is a permanent magnet?
Made of naturally ferromagnetic material
What is the field strength of a permanent magnet?
0-.03 Tesla
Good homogeneity
What are the advantages of a permanent magnet?
No fringe field
Low field strength range
No electrical power to maintain B0
No cryogen
What are the disadvantages of a permanent magnet?
Low field strength
Weight range
What is a Resistive magnet?
Requires continuous flow of electricity in electromagnetic coils and have a B0
Operates above tan superconductive
