Parameters 1

Question 1

Increasing TR will:

a) Increase SNR and scan time
b) Decrease SNR and scan time
c) Improve spatial resolution
d) Decrease SAR

Answer 1

a) Increase SNR and scan time

Question 2

A shorter TR leads to:

a) Increased SNR
b) Decreased scan time
c) Increased SAR
d) Both b & c

Answer 2

d) Both b & c

Longer TR allows more signal recovery (higher SNR) but takes more time

Tissues are more exposed to the RF pulses at a time

Question 3

Which parameter is directly affected by TR?

a) T2 weighting
b) T1 weighting
c) Spatial resolution
d) Chemical shift

Answer 3

b) T1 weighting

Question 4

A long TR is required for:

a) T1-weighted imaging
b) PD-weighted imaging
c) Susceptibility-weighted imaging
d) STIR

Answer 4

b) PD-weighted imaging

Long TR removes T1 contrast, short TE removes T2 contrast → PD contrast remains

Question 5

Decreasing TR will:

a) Decrease SNR
b) Increase scan time
c) Reduce SAR
d) Increase motion artifacts

Answer 5

a) Decrease SNR

Question 6

Increasing TE will:

a) Increase T1 contrast
b) Increase T2 contrast
c) Decrease scan time
d) Increase SNR

Answer 6

b) Increase T2 contrast

Question 7

A long TE is best suited for:

a) T1-weighted imaging
b) PD-weighted imaging
c) T2-weighted imaging
d) Gradient echo sequences

Answer 7

c) T2-weighted imaging

Question 8

Reducing TE will:

a) Improve T2 weighting
b) Reduce scan time
c) Increase spatial resolution
d) Increase SNR

Answer 8

d) Increase SNR

Question 9

TE primarily affects:

a) Image resolution
b) Contrast weighting
c) SNR and spatial resolution equally
d) SAR

Answer 9

b) Contrast weighting

TE controls T2 contrast—long TE enhances T2 effects, short TE minimizes them

Question 10

A very short TE is typically used in:

a) T2-weighted images
b) Gradient echo sequences
c) DWI scans
d) Inversion recovery sequences

Answer 10

b) Gradient echo sequences

Gradient echoes don’t refocus T2* decay, so short TE helps keep signal strong

Question 11

Increasing FOV will:

a) Improve spatial resolution
b) Increase SNR
c) Reduce chemical shift artifacts
d) Both b & c

Answer 11

d) Both b & c

Bigger FOV = bigger pixels (less detail) but more signal per pixel (better SNR)

Question 12

Decreasing FOV results in:

a) Lower SNR
b) Higher spatial resolution
c) Increased scan time
d) Both a & b

Answer 12

d) Both a & b

Question 13

A small FOV is used when:

a) High SNR is needed
b) High spatial resolution is required
c) Motion artifacts are a concern
d) Fat suppression is required

Answer 13

b) High spatial resolution is required

Question 14

What is a common disadvantage of increasing FOV?

a) Increased truncation artifacts
b) Lower spatial resolution
c) Increased motion artifacts
d) Increased SAR

Answer 14

b) Lower spatial resolution

Question 15

A large FOV will result in:

a) Improved spatial resolution
b) Increased partial volume effects
c) Higher chemical shift artifacts
d) Higher SAR

Answer 15

b) Increased partial volume effects

Question 16

Increasing NSA/NEX:

a) Reduces motion artifacts
b) Increases scan time
c) Improves SNR
d) All of the above

Answer 16

d) All of the above

Question 17

What happens when NSA is reduced?

a) Scan time increases
b) Motion artifacts increase
c) SNR decreases
d) Both b & c

Answer 17

d) Both b & c

More averages reduce noise and help smooth out motion-related distortions

Question 18

The primary reason to increase NSA is:

a) To increase spatial resolution
b) To reduce motion artifacts
c) To decrease scan time
d) To increase contrast

Answer 18

b) To reduce motion artifacts

Question 19

A high NSA is beneficial when:

a) Imaging pediatric patients
b) Performing fast scans
c) Reducing motion artifacts
d) Increasing spatial resolution

Answer 19

c) Reducing motion artifacts

Averaging multiple signals cancels out motion errors

Question 20

If you need to reduce scan time but maintain image quality, what is the best adjustment to NSA?

a) Decrease NSA
b) Increase NSA
c) Keep NSA constant
d) Increase FOV instead

Answer 20

a) Decrease NSA

Question 21

Increasing ETL will:

a) Decrease scan time
b) Increase SAR
c) Reduce SNR
d) All of the above

Answer 21

d) All of the above

Question 22

A longer ETL is beneficial for:

a) Reducing motion artifacts
b) Increasing scan time
c) Improving spatial resolution
d) Decreasing SAR

Answer 22

a) Reducing motion artifacts

Shorter scan time = less chance for movement

Question 23

What happens to blurring when ETL is increased?

a) It increases
b) It decreases
c) It stays the same
d) It is eliminated

Answer 23

a) It increases

Question 24

Reducing ETL leads to:

a) Shorter scan times
b) Improved spatial resolution
c) Higher SNR
d) Both b & c

Answer 24

d) Both b & c

Later echoes have weaker signals, causing blur and reducing SNR

Question 25

What is a potential disadvantage of increasing ETL? a) Higher SNR b) More truncation artifacts c) Increased blurring d) Decreased SAR

Answer 25

c) Increased blurring Signal loss in later echoes leads to image blur

Question 26

Increasing rBW will: a) Reduce chemical shift artifacts b) Increase SNR c) Increase scan time d) Decrease SAR

Answer 26

a) Reduce chemical shift artifacts

Question 27

A low rBW results in: a) Higher SNR b) More chemical shift artifacts c) Longer scan times d) Both a & b

Answer 27

d) Both a & b Wider rBW reduces frequency-related distortions

Question 28

What is the main reason to increase rBW? a) Improve SNR b) Reduce SAR c) Reduce metal artifacts d) Improve spatial resolution

Answer 28

c) Reduce metal artifacts

Question 29

A wide rBW is beneficial when imaging: a) Fat-suppressed sequences b) Metal implants c) Pediatric patients d) High-field MRI

Answer 29

b) Metal implants Higher rBW reduces metal distortion

Question 30

Narrowing the rBW results in: a) Lower SNR b) Increased chemical shift c) Shorter scan times d) Reduced SAR

Answer 30

b) Increased chemical shift

Question 31

Increasing the flip angle will: a) Increase SNR b) Increase SAR c) Decrease scan time d) Both a & b

Answer 31

d) Both a & b

Question 32

A small flip angle is used in: a) T1-weighted imaging b) Gradient echo sequences c) Spin echo sequences d) DWI

Answer 32

b) Gradient echo sequences

Question 33

SAR increases when: a) Flip angle is decreased b) Flip angle is increased c) TR is shortened d) Both b & c

Answer 33

d) Both b & c Flip angle depends on TR and the tissue’s T1 properties

Question 34

What happens when flip angle is too high? a) SAR increases b) SNR decreases c) Scan time decreases d) Image contrast improves

Answer 34

a) SAR increases

Question 35

What happens to T1 contrast when the flip angle increases? a) It increases b) It decreases c) It stays the same d) It depends on TR

Answer 35

a) It increases

Question 36

Which combination of TR and TE produces T2-weighted images? a) Short TR, short TE b) Long TR, short TE c) Short TR, long TE d) Long TR, long TE

Answer 36

Long TR, long TE Long TR removes T1 contrast, long TE enhances T2 contrast

Question 37

How does increasing the field of view (FOV) affect image quality? a) Increases spatial resolution and decreases SNR b) Increases SNR and decreases spatial resolution c) Increases both SNR and spatial resolution d) Decreases both SNR and spatial resolution

Answer 37

b) Increases SNR and decreases spatial resolution Larger pixels collect more signal (better SNR) but reduce detail (lower resolution)

Question 38

What is the primary benefit of increasing NSA/NEX? a) Reducing scan time b) Reducing motion artifacts c) Increasing spatial resolution d) Reducing SAR exposure

Answer 38

b) Reducing motion artifacts More averages smooth out motion-related distortions

Question 39

What is a drawback of using a longer Echo Train Length (ETL)? a) Increased spatial resolution b) Increased blurring c) Increased SNR d) Reduced scan time

Answer 39

b) Increased blurring Later echoes lose signal, causing blurring

Question 40

Why is a higher receive bandwidth (rBW) useful in MRI? a) Reduces chemical shift and metal artifacts b) Increases spatial resolution c) Increases SNR d) Increases T1 contrast

Answer 40

a) Reduces chemical shift and metal artifacts A wider rBW reduces frequency-related distortions