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Radiological Medical Devices: MRI Advantages, Limitations, and Function

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Radiological Medical Devices: MRI Advantages, Limitations, and Function

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Questions and Answers

What is the main function of the patient table in an MRI machine?

Generates the magnetic field

Slides the patient into the MRI machine (correct)

Detects RF signals emitted by the patient

Feeds information into the computer system

What is the role of the computer system in an MRI machine?

Slides the patient into the MRI machine

Generates the static magnetic field

Detects RF signals emitted by the patient (correct)

Feeds information into the coils

What characteristic best describes static magnetic fields in MRI machines?

They have a high frequency

Their direction remains constant over time (correct)

Their intensity changes over time

They are generated by natural sources only

What is the frequency of static magnetic fields used in MRI machines?

$0$ Hz Signup and view all the answers

Why should pregnant patients not be exposed to static magnetic fields exceeding $2.5$ T?

To avoid any potential harm to the fetus Signup and view all the answers

What is the recommended limit for static magnetic field exposure for whole-body scanning?

$< 2$ T Signup and view all the answers

What precaution should patients with implants take when near an MRI area?

Avoid exposure to static magnetic fields below $0.5$ mT Signup and view all the answers

What statement correctly describes the generation of the main magnet field in an MRI machine?

A large electric charge spinning on a helium-cooled superconducting coil generates it Signup and view all the answers

Which factor determines the size of the magnetic field needed for MRI imaging?

The uniformity and size required for accommodating an adult human being Signup and view all the answers

Why are Earth's magnetic fields mentioned in relation to MRI magnet strength?

They are used as a reference point for measuring MRI magnet strength Signup and view all the answers