DBR50023 - Principle Operation of MRI

What does MRI stand for?

• Magnetic Radiation Imaging

• Magnetic Resonance Imaging

• Medical Radiography Imaging

• Microscopic Resolution Imaging

Which property of atomic nuclei is exploited in MRI?

• Electronegativity

• Nuclear magnetic resonance

• Atomic mass

• Ionization energy

In MRI, what is the primary magnetic field generated by?

• Electromagnets

• X-ray tubes

• Ultrasound transducers

• Lasers

What is the unit of measurement for the strength of the magnetic field in MRI?

• Volts

• Teslas

• Hertz

• Amperes

In MRI, how are radiofrequency pulses used to create images?

• To create a static magnetic field

• To excite hydrogen nuclei

• To measure temperature

• To generate X-rays

What phenomenon allows MRI to distinguish between different types of tissues based on their hydrogen density and relaxation times?

• Resonance enhancement

• Spin precession

• Chemical bonding

• Ionization

In MRI, what is the purpose of the RF coil?

• To generate the main magnetic field

• To produce gradient fields

• To detect the MR signal

• To cool the magnet

Which type of MRI contrast is primarily associated with differences in tissue relaxation times?

• T1-weighted

• T2-weighted

• Proton density

• Diffusion-weighted

What is the primary advantage of using a 3T MRI scanner over a 1.5T scanner?

• Faster scan times

• Higher spatial resolution

• Reduced cost

• Lower risk of artifacts

What is the term for the time it takes for the MR signal to decay after the RF pulse is turned off?

• Spin echo

• Relaxation time

• Proton density

• Ischemia