10.3 Magnetic resonance imaging (MRI)

• What does MRI use to produce detailed images of the body's internal structures?

  Magnetic fields and radio waves
• Match the MRI component with its purpose:

  RF Coils ↔️ Emit and receive radio waves

  Gradient Coils ↔️ Encode spatial information
• MRI provides lower image detail compared to X-ray and CT scans.

  False
• The strong magnetic fields in MRI align the hydrogen protons in the body.
• Steps in the basic principles of MRI:

  1️⃣ Magnetic fields align protons

  2️⃣ Protons absorb radio wave energy

  3️⃣ Protons re-emit signals

  4️⃣ Scanner measures signals

  5️⃣ Detailed images are constructed
• Strong magnetic fields in MRI align hydrogen protons in the body.


  True
• Gradient coils create small variations in the magnetic field to locate the source of detected signals.
• Which imaging method provides excellent soft tissue contrast without radiation?

  MRI
• The gradient coils in MRI create variations in the magnetic field across the body.


  True
• The strong magnet in MRI aligns the hydrogen protons in the body.
• The RF coils in an MRI scanner emit and receive radio waves to excite and detect the aligned protons
• Why is the alignment of hydrogen protons crucial in MRI?

  Foundation for imaging
• Radio waves in MRI excite hydrogen protons, which then create a signal detected by the scanner.


  True
• What do gradient coils achieve during spatial encoding in MRI?

  Magnetic field variations
• Image reconstruction in MRI involves processing detected signals using mathematical algorithms.


  True
• The strong magnet in an MRI scanner aligns hydrogen protons in the body.
• Why is the use of non-ionizing radio waves in MRI considered a key advantage over ionizing radiation techniques?

  Safety
• What type of waves are used in MRI to excite hydrogen protons?

  Radio waves
• MRI uses ionizing radiation, unlike X-ray and CT scans.

  False
• Order the three key steps in creating images in MRI:

  1️⃣ Spatial Encoding

  2️⃣ Signal Detection

  3️⃣ Image Reconstruction
• RF coils in MRI detect signals from excited hydrogen protons
• What role do RF coils play in MRI?

  Emit and detect radio waves
• Which heart condition can MRI help identify?

  Cardiomyopathy
• MRI is unsuitable for patients with certain metallic implants
• Patient movement during an MRI scan can introduce artifacts in the image.

  True
• Why is MRI more expensive than X-rays or CT scans?

  Complex technology
• The strong magnet in an MRI scanner aligns the protons in the body.
• Which imaging method does not use ionizing radiation?

  MRI
• Which imaging method offers excellent soft tissue contrast?

  MRI
• In Nuclear Magnetic Resonance (NMR), protons absorb and re-emit radio wave energy.


  True
• What property of hydrogen protons is exploited in MRI?

  Nuclear magnetic resonance
• What is the primary purpose of gradient coils in MRI?

  Encode spatial information
• MRI uses ionizing radiation, unlike X-ray and CT scans.

  False
• The three basic principles of MRI are magnetic fields, NMR, and imaging.
• What is a key advantage of MRI compared to X-ray and CT scans?

  No ionizing radiation
• What is the purpose of the strong magnet in an MRI scanner?

  Align hydrogen protons
• Gradient coils in an MRI scanner create small variations in the magnetic field strength across the body.


  True
• Gradient coils create small variations in the magnetic field strength, allowing the MRI scanner to locate the source of detected signals
• Match the imaging technique with the type of radiation used:

  MRI ↔️ Non-ionizing radio waves

  X-ray ↔️ Ionizing radiation
• The RF coils emit radio waves to excite the aligned hydrogen protons, which then re-emit energy to create a detectable signal