MRI Lecture Notes Flashcards

Flashcards created from lecture notes on MRI focusing on key concepts, terminology, and safety guidelines.

What are the underlying physical principles of MRI?

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

What does B0 represent in MRI?

B0 represents the main magnetic field strength.

What causes a phase shift in the spinning protons in MRI?

Phase encoding gradient.

What is k-space in MRI?

K-space is a matrix of voxels where raw imaging data are stored, containing frequency and phase information.

What are the two fundamental types of pulse sequences in MRI?

Spin Echo and Gradient Echo.

What is the purpose of the RF coil in MRI?

To apply the RF pulse for signal excitation in the imaging process.

What are TR and TE in MRI?

TR (Repetition Time) and TE (Echo Time) are timing parameters that can be adjusted to emphasize particular types of contrast.

What biological effects can result from the MRI static magnetic field (B0)?

Effects may include vertigo, nausea, phosphenes, and metallic taste.

How can hazards associated with MRI be controlled?

Through authorizations, management, screening, labeling, training, and controlled access areas.

What should be done when the MRI system has a quench?

Immediately evacuate the MRI environment due to potential asphyxiation and cold burns.

What factors can affect the absorption rate of RF energy in MRI?

Field strength, flip angle, pulse sequence.

What is the risk of contact burns during MRI?

Contact burns can occur from metallic objects that act as conductors.

What impacts the spatial gradient dB/dz in MRI?

It describes how the magnetic field strength changes with distance, measured in tesla per meter (T/m) or gauss per centimeter (G/cm).