MRI Q&A

1 Tesla is equal to

• 15000 gauss

• 10000 Gauss

• 1000 Gauss

• 5000 Gauss

What is the name of our MRI Scanner

• Magnetom Essenza

• Magnetom Avanto

• Somatom Essenza

• Magnetom Discovery

What is the precessional frequency of hydrogen protons at 0.5T

• 21.25 MHz

• 42,57 MHz

• 63.8 MHz

• 127.7 MHz

Where is the south pole end in our MRI scanner usually

• Towards the service entrance side

• Towards the roof

• Towards the floor

• Towards the Patient Table Side

If the current in a wire doubles, the induced magnetic field

• Quadruples

• Doubles

• Remains the same

• Is reduced by half

The direction of magnetic field lines surrounding a wire can be determined using

• The left-hand rule

• The right-hand rule

• Faraday's Law

• Lenz' Law

Concerning magnetic field strengths, which statement is true?

• The earth's magnetic field is about 0.5 G.

• A junkyard electromagnet that picks up cars is much stronger than the main field of most MR scanners.

• Research MR scanners for humans now exist with field strengths exceeding 20 T.

• Higher field strength scanners have wider bores than lower field strength scanners to accommodate the extra flux lines

Which of the following materials is paramagnetic?

• Water

• Fat

• Bone

• Air

Answer explanation

Most biological tissues (including water, fat, and bone) are weakly diamagnetic. Molecular O₂ is paramagnetic, overwhelming the weak diamagnetism of the other components of air N₂ and CO₂.