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MRI Shimming Process

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Questions and Answers

What is the purpose of shimming in the context of superconducting magnets?

To decrease the strength of the magnetic field
To increase the homogeneity of the magnetic field (correct)
To introduce irregularities in the magnetic field
To disrupt the functioning of the RF coils

Which type of coils are essential components for MRI systems to obtain clear images?

Superconducting Coils
Steel Coils
RF Coils (correct)
Passive Coils

How is active shimming different from passive shimming?

Active shimming uses additional magnetic fields, while passive shimming does not
Active shimming requires electric current adjustment, while passive shimming does not (correct)
Active shimming aims to decrease magnetic field homogeneity, while passive shimming increases it
Active shimming does not use coils, while passive shimming relies on coils

What is the primary function of RF coils in MRI scanners?

Receive and/or transmit RF signals (D) Signup and view all the answers

Which type of coils are necessary for adjusting the static magnetic field homogeneity?

Coils with adjustable current (C) Signup and view all the answers

What is the main role of RF coils in an MRI system?

Receiving and transmitting radiofrequency waves (C) Signup and view all the answers

What is the purpose of shimming in MRI?

To improve the homogeneity of the static magnetic field (A) Signup and view all the answers

Which statement best describes passive shimming?

It adds small pieces of iron or magnetized materials to adjust the magnetic field. (D) Signup and view all the answers

What is active shimming in MRI characterized by?

Performing electrical adjustments with coils that have adjustable current. (A) Signup and view all the answers

Why is it necessary to shim an MRI magnet?

To make the homogeneity of the static magnetic field more uniform (A) Signup and view all the answers

Which method involves pieces of steel with good magnetic qualities in shimming?

Passive shimming (B) Signup and view all the answers

What does shimming involve in terms of adjusting the magnetic field homogeneity?

Using mechanical and/or electrical adjustments (D) Signup and view all the answers

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