#1
Which of the following materials is generally considered safe in MRI environments?
Aluminum
ExplanationNon-magnetic material, safe for use in MRI environments.
#2
What does the acronym MRI stand for?
Magnetic Resonance Imaging
ExplanationImaging technique that uses magnetic fields and radio waves.
#3
What is the purpose of a 'pre-MRI screening questionnaire' for patients?
To identify potential risks or contraindications related to the MRI procedure
ExplanationAssesses patient risks before undergoing MRI.
#4
In MRI, what does the term 'TE' stand for?
Time of Echo
ExplanationTime between the excitation pulse and echo signal.
#5
What is the purpose of the 'bore' in an MRI machine?
To provide a tunnel-like space for patients during scans
ExplanationEnclosed space where the patient lies during the scan.
#6
Which of the following is NOT a common safety concern in MRI?
Ionizing radiation exposure
ExplanationMRI does not use ionizing radiation in imaging.
#7
What is the purpose of the 'zone system' in MRI safety?
To define areas within the MRI suite based on the level of magnetic field exposure
ExplanationOrganizes areas based on magnetic field strength to mitigate risks.
#8
What is the purpose of the 'MR Conditional' designation for medical devices?
It means the device can be used in MRI environments under certain conditions
ExplanationDevices that can be safely used under specified MRI conditions.
#9
Which of the following is true regarding the '5 Gauss Line' in MRI safety?
It indicates the distance from the MRI machine within which magnetic fields are hazardous
ExplanationDefines the distance where magnetic fields pose risks.
#10
Which of the following is a common method to mitigate the risk of projectile accidents in MRI?
Using non-ferromagnetic materials in the MRI suite
ExplanationPrevents ferromagnetic objects from becoming projectiles.
#11
What is the primary danger associated with ferromagnetic materials in the MRI environment?
They can be attracted to the magnet, posing a projectile risk
ExplanationFerromagnetic objects can become dangerous projectiles.
#12
What is the purpose of the 'quench vent' in MRI systems?
To regulate the flow of liquid helium and prevent a catastrophic quench
ExplanationPrevents overheating by regulating liquid helium.
#13
What is the primary concern regarding patient implants in MRI?
They may cause interference with the magnetic field
ExplanationImplants can distort MRI images or cause harm.
#14
What is the primary concern associated with 'magnetohydrodynamic effect' in MRI?
It can induce electrical currents in the body
ExplanationMovement in a magnetic field can create electric currents.