MRI Physics Questions And Answers 100% Correct
Which of the following sets of parameters would likely provide the best T2 image weighting
when a GE pulse sequence is applied?
A. 1000 ms TR 5 m TE 20 degree flip angle
C. 2000 ms TR 5 ms TE 180 degree flip angle
D. 250 ms TR 20ms TE 10 degree flip angle - Correct Answer-D. 250 ms TR 20ms TE 10 degree
flip angle
What role do the protons that are aligned antiparallel to the main magnetic field play?
A. They contribute to signal for image detail and contrast
B. They do not contribute to signal
C. They contribute most of the signal
D. Their high energy signal appears in the outer area of k-space - Correct Answer-B. They do not
contribute to signal
What is another name for T2 Decay? - Correct Answer-spin-spin relaxation
How will fat appear on a T1 weighted pulse sequence?
A. Bright
B.Intermediate
C. Dark
D. Isointense - Correct Answer-A. Bright
What is the Larmor frequency for H in a 10,000 G MRI unit?
,A. 42.58 MHz/T
B. Depends on the gyromagnetic ratio of H
C. 42.58 MHz
D. Depends on the magnetic field strength - Correct Answer-C. 42.58 MHz
What type of information is stored in the central portion of k-space?
A. Low signal, contrast
B. Low signal, detail
C. High signal, contrast
D. High signal, detail - Correct Answer-A.Low signal, contrast
What unit of measurement is the homogeneity of the main magnetic field measured in?
A. mT/M
B. Bo
C. M
D. ppm - Correct Answer-D. ppm
How should the radiofrequency receiver coil be positioned to the static magnetic field?
A. Transverse
B. Parallel
C. Oblique
D. Horizontal - Correct Answer-A. Transverse
What component is the term fill factor best associated with?
A. Cryostat
B. RF Coil
,C. Shim Coil
D. Magnetic Sheilding - Correct Answer-B. RF Coil
What is used to cool.a resistive magnet?
A. Liquid Helium
B. Air
C. Water
D. Both liquid helium and nitrogen - Correct Answer-C. Water
What component is used to restrict the stray RF signals from entering the MRI suite?
A. RF Coils
B. Shim Coils
C. RF Sheilding
D. Active Sheilding - Correct Answer-C. RF Sheilding
What are the units of measurement G/cm and mT/m best associated with?
A. Specific absorptions rate
B. Larmor Frequency
C. Tissue Heating
D. Gradient Strength - Correct Answer-D. Gradient Strength
Which component is used to encode the RF signal into the patient?
A. RF transmit coil
B. RF receive coil
C. Gradient Coil
D. Shim coil - Correct Answer-C. Gradient coil
, What would 1 L of liquid helium equal in a gaseous state?
A. 820 L
B. 760 L
C. 720 L
D. 695 L - Correct Answer-B. 760 L
What is the temperature of liquid helium?
A. -317
B. -320
C. -452
D. -460 - Correct Answer-C. -452
Which of the following definition best defines signal-to-noise ratio?
A. Ability to differentiate between small structures
B. Difference between high and low signal
C. Difference between the signal and graininess of the image
D. Calculating the signal difference between 2 different points - Correct Answer-C. Difference
between the signal and graininess of the image
What effect does decreasing the slice thickness have on spatial resolution?
A. Increases
B. Decreases
C. No effect - Correct Answer-A. Increases
What effect does increasing the echo time have on scan time?
Which of the following sets of parameters would likely provide the best T2 image weighting
when a GE pulse sequence is applied?
A. 1000 ms TR 5 m TE 20 degree flip angle
C. 2000 ms TR 5 ms TE 180 degree flip angle
D. 250 ms TR 20ms TE 10 degree flip angle - Correct Answer-D. 250 ms TR 20ms TE 10 degree
flip angle
What role do the protons that are aligned antiparallel to the main magnetic field play?
A. They contribute to signal for image detail and contrast
B. They do not contribute to signal
C. They contribute most of the signal
D. Their high energy signal appears in the outer area of k-space - Correct Answer-B. They do not
contribute to signal
What is another name for T2 Decay? - Correct Answer-spin-spin relaxation
How will fat appear on a T1 weighted pulse sequence?
A. Bright
B.Intermediate
C. Dark
D. Isointense - Correct Answer-A. Bright
What is the Larmor frequency for H in a 10,000 G MRI unit?
,A. 42.58 MHz/T
B. Depends on the gyromagnetic ratio of H
C. 42.58 MHz
D. Depends on the magnetic field strength - Correct Answer-C. 42.58 MHz
What type of information is stored in the central portion of k-space?
A. Low signal, contrast
B. Low signal, detail
C. High signal, contrast
D. High signal, detail - Correct Answer-A.Low signal, contrast
What unit of measurement is the homogeneity of the main magnetic field measured in?
A. mT/M
B. Bo
C. M
D. ppm - Correct Answer-D. ppm
How should the radiofrequency receiver coil be positioned to the static magnetic field?
A. Transverse
B. Parallel
C. Oblique
D. Horizontal - Correct Answer-A. Transverse
What component is the term fill factor best associated with?
A. Cryostat
B. RF Coil
,C. Shim Coil
D. Magnetic Sheilding - Correct Answer-B. RF Coil
What is used to cool.a resistive magnet?
A. Liquid Helium
B. Air
C. Water
D. Both liquid helium and nitrogen - Correct Answer-C. Water
What component is used to restrict the stray RF signals from entering the MRI suite?
A. RF Coils
B. Shim Coils
C. RF Sheilding
D. Active Sheilding - Correct Answer-C. RF Sheilding
What are the units of measurement G/cm and mT/m best associated with?
A. Specific absorptions rate
B. Larmor Frequency
C. Tissue Heating
D. Gradient Strength - Correct Answer-D. Gradient Strength
Which component is used to encode the RF signal into the patient?
A. RF transmit coil
B. RF receive coil
C. Gradient Coil
D. Shim coil - Correct Answer-C. Gradient coil
, What would 1 L of liquid helium equal in a gaseous state?
A. 820 L
B. 760 L
C. 720 L
D. 695 L - Correct Answer-B. 760 L
What is the temperature of liquid helium?
A. -317
B. -320
C. -452
D. -460 - Correct Answer-C. -452
Which of the following definition best defines signal-to-noise ratio?
A. Ability to differentiate between small structures
B. Difference between high and low signal
C. Difference between the signal and graininess of the image
D. Calculating the signal difference between 2 different points - Correct Answer-C. Difference
between the signal and graininess of the image
What effect does decreasing the slice thickness have on spatial resolution?
A. Increases
B. Decreases
C. No effect - Correct Answer-A. Increases
What effect does increasing the echo time have on scan time?
