Magnetic resonance (MR) scanner (AQA A-Level Physics): Flashcards
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Type of magnet in MRI scanner
Type of magnet in MRI scanner
Superconducting magnet
Coolant for MRI superconducting magnet
Coolant for MRI superconducting magnet
Liquid helium
What nuclei does MRI detect?
What nuclei does MRI detect?
Protons (hydrogen nuclei)
Wobbling rotation of protons in magnetic field
Wobbling rotation of protons in magnetic field
Precession
Purpose of gradient coils in MRI
Purpose of gradient coils in MRI
Vary magnetic field strength in different body regions
What excites protons in MRI?
What excites protons in MRI?
RF (radiofrequency) pulses
Signal emitted by de-exciting protons
Signal emitted by de-exciting protons
RF (radiofrequency) signals
Two proton alignment directions in magnetic field
Two proton alignment directions in magnetic field
Parallel or antiparallel
How to adjust MRI image contrast
How to adjust MRI image contrast
Change time between RF pulses
MRI contraindication
MRI contraindication
Patients with metal implants (e.g. pacemakers)