MRI magnet basics, T1 versus T2 weighting, and MRI safety screening concepts tested on radiologic technology certification exams.
34 cards · basic cards · AI-written, checked twice. Edit anything.
- What does the acronym MRI stand for?
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Magnetic Resonance Imaging- What unit measures magnetic field strength in MRI?
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Tesla- 1 Tesla equals how many Gauss?
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10,000 Gauss- What type of magnet is used in most clinical MRI scanners?
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Superconducting magnet- What substance cools the coils of a superconducting MRI magnet?
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Liquid helium- What is the term for a sudden, uncontrolled loss of superconductivity in an MRI magnet?
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A quench- Why is a magnet quench dangerous to people in the room?
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Escaping helium gas can displace oxygen and create an asphyxiation risk- Which atomic nucleus is most commonly imaged in clinical MRI?
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Hydrogen (a single proton)- What equation relates magnetic field strength to the precession frequency of protons?
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The Larmor equation- What is the main function of the gradient coils in an MRI system?
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They allow spatial localization of the MR signal- What is the main function of the RF coils in an MRI system?
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They transmit RF pulses and/or receive the returning MR signal- In MRI pulse sequences, what does TR stand for?
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Time to repetition, the time between successive RF excitation pulses- In MRI pulse sequences, what does TE stand for?
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Time to echo, the time between the RF pulse and the signal echo- A short TR combined with a short TE produces what type of image weighting?
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T1 weighted- A long TR combined with a long TE produces what type of image weighting?
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T2 weighted
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