6.5.3 Magnetic Resonance Imaging (MRI)

• MRI exposes patients to ionizing radiation.

  False
• Steps in the MRI image creation process

  1️⃣ Protons align in a magnetic field

  2️⃣ Radio waves are applied

  3️⃣ Protons absorb energy and change alignment

  4️⃣ Radio waves are turned off

  5️⃣ Protons emit energy as they return to original alignment
• Which imaging technique has a shorter scan time, MRI or X-ray?

  X-ray
• What happens to protons when a radio wave pulse is applied in NMR?

  They absorb energy
• NMR is the underlying principle of MRI.


  True
• MRI does not use ionizing radiation, making it safer than X-ray imaging.
• Applying a radio wave pulse causes protons to absorb energy
• Order the components of an MRI system by their primary function:

  1️⃣ Main Magnet: Generates a strong magnetic field

  2️⃣ Gradient Coils: Produce localized field gradients

  3️⃣ RF Coil: Transmits radio waves

  4️⃣ Computer System: Processes signals for image reconstruction
• What type of image does the computer system in MRI reconstruct?

  3D image
• What are the two key components used in MRI to create detailed images?

  Radio waves and magnetic fields
• Order the steps involved in creating an MRI image

  1️⃣ Protons align in a magnetic field

  2️⃣ Radio waves are applied

  3️⃣ Protons absorb energy

  4️⃣ Radio waves are turned off

  5️⃣ Protons emit energy
• MRI provides high detail of soft tissues
• What is the underlying principle of MRI?

  Nuclear magnetic resonance
• What happens to protons when radio waves are turned off in NMR?

  They emit energy
• A radio wave pulse in MRI causes protons to change their alignment


  True
• Which component of an MRI system processes signals to create the final image?

  Computer system
• What is a primary advantage of MRI over X-ray imaging?

  Higher contrast for soft tissues
• When protons emit energy, the amount depends on their local environment.


  True
• MRI uses ionizing radiation to produce images, unlike X-ray imaging.

  False
• When protons are placed in a strong magnetic field, they align either parallel or anti-parallel to the field.
• MRI provides high-resolution images of bone structures.

  False
• What is the underlying principle behind MRI?

  Nuclear magnetic resonance
• When protons return to their original alignment, they emit energy.
• Steps in the NMR process

  1️⃣ Body is placed in a strong magnetic field

  2️⃣ Protons align parallel or anti-parallel

  3️⃣ Radio wave pulse is applied

  4️⃣ Protons absorb energy and change alignment

  5️⃣ Protons emit energy as they return to original alignment
• What type of energy is emitted by protons as they return to their original alignment in MRI?

  Radio frequency
• What is the primary advantage of MRI over X-ray imaging in terms of radiation exposure?

  No ionizing radiation
• The amount of energy emitted by protons depends on their local environment.


  True
• MRI relies on the absorption and emission of energy by protons in the body's tissues.


  True
• What type of radiation is not used in MRI imaging?

  Ionizing radiation
• The energy emitted by protons in MRI is used to construct the image

  True
• Contrast agents are always required in MRI for high-quality images

  False
• Protons in the body align either parallel or anti-parallel to a magnetic field in NMR


  True
• MRI produces high-contrast images without exposing patients to ionizing radiation
• What is the purpose of the main magnet in an MRI system?

  Aligns protons
• Placing the patient in a strong magnetic field aligns protons in the body

  True
• The radio frequency (RF) coil transmits a radio wave pulse, causing the protons to absorb energy.
• Which component of the MRI system detects the emitted energy from protons?

  RF coil
• Match the medical application with the imaging technique best suited for it:

  Brain tumors ↔️ MRI

  Bone fractures ↔️ X-ray

  Heart disease ↔️ CT angiography
• Which imaging technique is highly effective for visualizing joints, ligaments, and tendons?

  MRI
• CT scans are often used initially for imaging abdominal and pelvic organs, with MRI providing higher-resolution follow-up.

  True