MRI Components & Functions/Understanding magnets, gradients, and RF

Magnet

Which part of the MRI machine is responsible for generating the main magnetic field?

RF Coils

Gradient Coils

Console

Magnet

Creating magnetic field gradients

The gradient coils in an MRI machine are primarily responsible for:

Producing radiofrequency pulses

Generating the main magnetic field

Creating magnetic field gradients

Monitoring patient vital signs.

True

The RF coils in an MRI machine are responsible for detecting the signals emitted by the patient's body.

True

False

Controlling the MRI scan parameters and sequences

The console of an MRI machine is used for:

Patient preparation

Controlling the MRI scan parameters and sequences

Creating images

Maintaining the temperature in the MRI room

Superconducting magnet

The bore of the MRI machine is where the patient is placed during the scan. What type of magnet is typically used in the bore?

Permanent magnet

Superconducting magnet

Electromagnet

Ferromagnetic magnet

False

The purpose of the RF shielding in an MRI machine is to protect the operator from the magnetic field.

True

False

Patient Monitoring System

Which component of the MRI machine is responsible for monitoring and displaying patient vital signs during the scan?

RF Coils

Gradient Coils

Console

Patient Monitoring System

Adjust the main magnetic field for homogeneity

The shimming process in MRI is used to

Create RF pulses

Adjust the main magnetic field for homogeneity

Calculate patient BMI

Regulate patient temperature.

False

The purpose of the patient table in the MRI machine is solely for patient comfort

True

False

Prevent cryogen escape in case of a magnet quench

The function of the quench pipe in an MRI machine is to

Provide anesthesia to the patient

Maintain proper lighting in the MRI room

Prevent cryogen escape in case of a magnet quench

Calibrate the RF coils

Diamagnetic

Small negative magnetic susceptibility

Diamagnetic

Paramagnetic

Ferromagnetic

NONE

Flux density measured by Tesla

Number of magnet field lines passing through a given closed surface

Flux density measured by Tesla

Flux density measured by HERTZ

Magnet fringe measured by meter

Magnet fringe measured by Tesla.

Magnet fringe measured by mTesla

The fringe field is the peripheral magnetic field outside of the magnet core.

Flux density measured by Tesla

Flux density measured by HERTZ

Magnet fringe measured by meter

Magnet fringe measured by mTesla

Horizontal

Magnetic field direction in Super conducting electromagnet

Horizontal

Vertical

Oblique

All above

True

The RF coils in an MRI machine are responsible for both transmitting and receiving radiofrequency signals.

True

False

True

The bore of the MRI machine is typically constructed from ferromagnetic materials.

True

False

True

The RF coils in an MRI machine are responsible for both transmitting and receiving radiofrequency signals

True

False

False

The console of the MRI machine is responsible for generating the main magnetic field.

True

False

False

The MRI machine's RF shielding protects the operator and the surrounding environment from radiofrequency interference.

True

False

Shim Coil

Responsible for adjusting the main magnetic field for homogeneity.

RF Coils

Creates radiofrequency pulses and receives signals from the patient's body.

Bore

Houses the patient during the scan

Console

Controls the MRI scan parameters and sequences.

Primary magnet

In an MRI machine, which type of magnet generates the main static magnetic field?

Electromagnet

Primary magnet

Superconducting magnet

Gradient magnet

Tesla (T)

The strength of the main magnetic field in an MRI machine is typically measured in which unit?

Watts (W)

Volts (V)

Tesla (T)

Hertz (Hz)

False

Superconducting magnets in MRI machines require continuous power to maintain the magnetic field

True

False

To create magnetic field gradients for spatial encoding

What is the primary purpose of gradient coils in MRI?

To produce radiofrequency (RF) pulses

To generate the main magnetic field

To create magnetic field gradients for spatial encoding

Maintain patient comfort d. Reduce the acoustic noise of the MRI machine

Prevent The main magnet field extend into areas other than the magnet room

The "shielding" around the MRI machine is primarily designed to:

Protect the operator from radiation exposure

Prevent The main magnet field extend into areas other than the magnet room

Maintain patient comfort.

Reduce the acoustic noise of the MRI machine

True

The gradient coils are responsible for encoding spatial information in MRI by creating variations in the magnetic field strength.

True

False

RF Coils

In an MRI machine, which component is responsible for generating the RF pulses used in image formation?

Permanent magnet

Gradient coils

Console

RF Coils

Protons

The term "magnetic resonance" in MRI refers to the behavior of Gradient coils

Electrons

Atomic nuclei

Protons

Photons

Adjust the main magnetic field for homogeneity

The process of "shimming" in MRI is used to:

Generate RF pulses

Adjust the main magnetic field for homogeneity

Measure patient heart rate

Regulate room lighting

Active shielding

The second set of superconducting coils is positioned outside the primary coil but still inside the cryostat.

Active shielding

Passive shielding

A&B

Superconducting

False

In MRI, higher magnetic field strength always results in better image quality.

True

False

Gradient amplitude

How steep a gradient slop can be achieved when the gradient coil element is activated is:

Gradient amplitude

Gradient rise time

Gradient slew rate

Gradient power duty cycle

False

Electromagnets are commonly used as the main magnets in MRI machines

True

False

False

Superconducting magnets are ideal for MRI machines because they require continuous power.

True

False

True

The gradient coils in MRI are responsible for creating spatial encoding.

True

False

False

The RF coils in MRI are used for temperature regulation in the MRI room.

True

False

False

Shimming is a process used to adjust the gradient coils

True

False

True

The main function of the magnet is to align the hydrogen nuclei (protons) in the body's tissues.

True

False

Magnetic Resonance

The behavior of atomic nuclei in a magnetic field, the basis of MRI

Shimming

Used to adjust the main magnetic field for homogeneity

RF Coils

Responsible for generating RF pulses for image formation

Superconducting Magnet

A type of magnet that requires extremely low temperatures to maintain its superconducting state

Gradient Coil

Used to create variations in magnetic field strength for spatial encoding