REVISION TEST

What is the function of the cryogen in an MRI machine?

• A) Improve image contrast

• B) Cool the gradient coils

• C) Maintain superconductivity in the magnet

• D) Prevent patient motion

Which shielding technique is used to prevent RF interference in MRI rooms?

• A) Lead shielding

• B) Copper shielding (Faraday cage)

• C) Iron shielding

• D)Water shielding

Who invented MRI?

• Phelps

• Wilhelm Conrad Röntgen

• Dr. Raymond Vahan Damadian

• Thomas Edison

What is a "quench" in the context of MRI?

• A) Loss of image signal

• B) Sudden drop in room temperature

• C) Sudden loss of superconductivity in the magnet

• D) Malfunction of gradient coils

Can you undergo an MRI scan if you have metallic implants?

• Yes

• No

• Depends on the situation

MRI is used to detect the following EXCEPT

• Stroke

• Brain injury from trauma

• Tumors

• Moving fluid

What is the primary gas used as a cryogen in MRI systems?

• A) Helium

• B) Hydrogen

• C) Nitrogen

• D) Carbon dioxide

What is the most immediate response if a quench occurs and helium is venting into the MRI room?

• A) Increase scan speed

• B) Turn off RF coils

• C) Evacuate the room immediately

• D) Call for patient assistance

What is the main component used in MRI to generate the magnetic field?

• A) X-rays
  
  

• B) Ultrasound

• C) Superconducting magnet

• 
  D) Gamma rays

Which nucleus is most commonly used in clinical MRI?

• A) Carbon-12

• B) Oxygen-16

• C) Hydrogen-1

• D) Nitrogen-14