WorksheetsMRI Exercises
Total questions: 18
Worksheet time: 9mins
What is the main function of the RF coils in an MRI scanner?
To transmit radio frequency waves into the patient's body
To receive signals from the patient
To create the magnetic field
To control the scanner operation
What is the purpose of the slice selection gradient in MRI?
Localizes the point in a slice
Creates the transverse magnetization
Receives the MR signal
Determines the slice position
What is the time interval between the start of the RF pulse and the start of the next excitation known as?
Transverse relaxation time (T2)
Time to echo (TE)
Time to repeat (TR)
Longitudinal relaxation time (T1)
What is the main application of Functional Magnetic Resonance Imaging (fMRI)?
To observe brain structures
To diagnose aneurysms
To differentiate between white matter and grey matter
To assess neurological status
Why is it important for patients to complete a questionnaire before having an MRI?
To determine the strength of the magnetic field
To assess the patient's medical history
To select the appropriate scanning parameters
To calibrate the RF coils
What happens to the longitudinal magnetization (LM) when the RF pulse is switched off?
It decreases
It remains the same
It increases
It disappears
What is the purpose of K-space in MRI image formation?
To generate the magnetic field
To transmit radio frequency waves
To store raw data for image reconstruction
To localize the signal origin
Which component of an MRI scanner is responsible for creating a variable magnetic field?
RF coils
Gradient coils
Antenna
Computer system
What is the effect of reducing the receiver bandwidth in MRI?
Reduces susceptibility artifact
Improves signal-to-noise ratio
Increases chemical shift artifact
Shortens T2 relaxation time
The Z axis is aligned with the ____
Patient’s left to right
Long axis of the patient’s body
Patient’s anterior to posterior
What does the computer do with the signals detected by the MRI machine?
It amplifies the radio signals
It creates a three-dimensional model
It translates these signals into an image
It records the signals for further analysis
Does MRI use ionising radiation?
Yes
No
Only in certain conditions
Only with additional equipment
What is the appearance of fluid in a T2 weighted MRI scan?
Fluid is dark
Fluid is of variable intensity
Fluid is invisible
Fluid is bright
What is the appearance of fluid in a T1 weighted MRI scan?
Fluid is bright
Fluid is dark
Fluid is invisible
Fluid is of variable intensity
For which of the following is MRI mainly used?
Fractures
Muscle strains
Tumours
Common cold
What is the function of the phase encoding gradient in MRI image formation?
To generate the magnetic field
To encode spatial information
To receive MR signals
To determine the slice position
What is the purpose of the receiver coil in an MRI machine?
To generate the magnetic field
To amplify the radio signals
To create the transverse magnetization
To receive signals from the patient
What determines the size of the pixels in MRI when the matrix size is held constant?
Field of View (FOV)
Signal to Noise Ratio (SNR)
Transmit and Receive Coil (RF Coil)
Surface Coils
