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Magnetic Resonance Imaging (MRI) System Components

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Questions and Answers

What is the function of the Main magnet in an MRI system?

To produce gradient magnetic field
To generate static magnetic field (correct)
To slide the patient into the MRI machine
To produce radiofrequency waves

Why is the Radio-frequency (RF) coil important in an MRI system?

To produce radiofrequency waves that penetrate the body (correct)
To slide the patient into the MRI machine
To produce gradient magnetic field
To generate static magnetic field

What is the role of the Computer system in an MRI setup?

To generate static magnetic field
To detect RF signals emitted by the patient's body and feed this information into the computer system (correct)
To produce radiofrequency waves
To slide the patient into the MRI machine

Why do static magnetic fields used in MRIs have a frequency of 0 Hz?

To indicate direction changes over time (B) Signup and view all the answers

What is the main difference between Earth's magnetic field and an MRI magnet's field?

Earth's magnetic field is weaker than the MRI magnet's field. (A) Signup and view all the answers

Why should pregnant patients not be exposed to an MRI machine > 2.5 T?

High-intensity fields can affect fetal development. (B) Signup and view all the answers

What is the function of the gradient magnetic field in an MRI machine?

To produce different intensities for imaging purposes. (A) Signup and view all the answers

What distinguishes a superconductive magnet from a permanent magnet in an MRI machine?

Superconductive magnets do not require cryogen. (A) Signup and view all the answers

Why have permanent magnets with a horizontal field been considered innovative?

They allow patients to be positioned upright during scanning. (A) Signup and view all the answers

Which disadvantage is associated with permanent magnets in MRI machines?

Large fringe field (D) Signup and view all the answers

What is a significant advantage of resistive electromagnets compared to other types of electromagnets?

Low capital costs (A) Signup and view all the answers

Why are resistive electromagnets preferred when capital costs are a major concern?

Low capital costs (A) Signup and view all the answers

What is a key disadvantage of resistive electromagnets that limits their application in some contexts?

High power consumption (A) Signup and view all the answers

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