MRI_Cross_sectional_imaging__2_-_Part_2

What are the underlying physical principles of MRI?

Signal Generation, Introduction to weightings, Basics of Equipment, Hardware and Safety.

What does the term 'B0' refer to in MRI?

The static magnetic field strength.

How is signal localization achieved in MRI?

By using gradients to create linear variations of the magnetic field strength.

What is the function of gradient coils in an MRI system?

They cause a change in the magnetic field strength to locate signals from specific areas.

What types of imaging planes are used in MRI?

Coronal, Axial, and Sagittal.

What does TR stand for in MRI pulse sequences?

Repetition Time.

What is FLAIR in MRI?

Fluid-Attenuated Inversion Recovery; it suppresses the signal from fluids.

What is K-space in MRI?

A matrix of voxels where raw imaging data are stored.

What determines the contrast in MRI imaging?

The combination of TR (Repetition Time) and TE (Echo Time) settings.

What is the primary safety concern associated with static magnetic fields in MRI?

Projectile hazards from ferromagnetic objects.

How can RF deposition be mitigated in MRI?

By using measures such as increasing the TR, reducing flip angles, and maintaining patient cooling.

What must be done to maintain MRI safety regarding authorized personnel?

Staff must be trained, labeled, and monitored to control access to MRI areas.

What is the purpose of the Larmor frequency in MRI?

It is the frequency at which the hydrogen nuclei resonate in the magnetic field.

What is SAR in the context of MRI?

Specific Absorption Rate; it measures the amount of energy absorbed by the body.

What is the role of the MRI Responsible Person?

To ensure day-to-day safety and compliance in the MRI department.

What can occur if resistance increases in a superconducting magnet?

A magnetic quench may happen, leading to loss of magnetic field.