Part A

Question 1

If a square 200mm FOV is increased to 400mm and the matrix increased from 256 x 256 to 512 x 512, the resultant image would have:
A) Increased Resolution
B) Decreased Resolution
C) The Same Resolution

Answer 1

C) The same resolution

Question 2

Shim Coils are used to improve:
A) magnet homogeneity
B) RF output of the transmitter
C) the specific performance of phased array coils
D) none of the above

Answer 2

A) magnet homogeneity

Question 3

The Nyquist theorem states that for any signal to be reproduced or represented accurately it needs to be sampled ____ per cycle
A) not significant
B) once
C) at least twice

Answer 3

C) at least twice

Question 4

The time for tissues to regain maximum longitudinal value occurs at approximately _______ times the T1 value of the tissue.
A) 1
B) 2
C) 5
D) 12

Answer 4

C) 5
(Usually takes 3-5x T1 times to fully recover to maximum longitudinal value)

Question 5

The cryogen most commonly used to keep the magnet coil at superconducting temperature is:
A) helium
B) nitrogen
C) oxygen
D) b and c

Answer 5

A) Helium

Question 6

The MR signal is produced by magnetization _____?
A) out of phase
B) in the longitudinal direction
C) decaying in the longitudinal direction
D) in phase and in the transverse plane only

Answer 6

D) in phase and in the transverse plane only

Question 7

The magnetic field associated with the hydrogen nucleus is referred to as:
A) net magnetisation
B) high energy
C) magnetic moments
D) B1

Answer 7

A) net magnetisation

Question 8

Spins aligned in the parallel direction are said to be in the….?
A) high energy state
B) low energy state
C) transverse plane
D) all of the above

Answer 8

B) low energy state

Question 9

Gadolinium is an example of a _______ contrast agent
A) diamagnetic
B) paramagnetic
C) ferromagnetic
D) T2 enhancing

Answer 9

B) Paramagnetic

Question 10

With pathology that causes an increase in water content (I.e oedema), the T2 time of the affected tissue will?
A) shorten
B) lengthen
C) fluctuate
D) remain unchanged

Answer 10

B) lengthen
Water has a long T2 time

Question 11

Spin Density can be defined as
A) the time for 63% of the transverse magnetisation to recover
B) the time for 27% of the transverse magnetisation to decay
C) the molecular weight of the molecule
D) the number of resonating spins in a given volume of tissue

Answer 11

D) the number of resonating spins in a given volume of tissue

Question 12

T2* is shorter than T2 due to
A) field strength
B) the 90 degree pulse
C) Larmor equation
D) inhomogeneities and chemical shift

Answer 12

D) inhomogeneities and chemical shift

Question 13

The B1 field is produced by:
A) the gradient coil
B) the shim coil
C) the RF coil
D) the magnet coil

Answer 13

C) The RF coil

Question 14

Functional MRI (fMRI) uses the blood oxygen level dependent or BOLD effect to generate images of brain activation? True or False

Answer 14

True

Question 15

Flexible RF coils are direction sensitive? True or False

Answer 15

True

Question 16

Increased signal on a MR DWI can indicate?
a) Restriction of random molecular motion by boundaries such as membranes, ligaments or macromolecules
b) effects of T2 shine through
c) Normal diffusion of water molecules
d) a and b

Answer 16

d) a and b

Question 17

The method used to restrict the main magnetic field of a scanner to within the scan room is?
a) Shimming
b) Shielding
c) Hedging

Answer 17

b) Shielding

Question 18

Which of the following surface coils will yield the highest SNR?
a) a 3” circular
b) a 5” circular
c) a 3 coil array using 5” coils
d) an 11” x 14” rectangular coil

Answer 18

a) a 3” circular

Question 19

To increase the amplitude of a gradient magnetic field, _______ current is required in the gradient coils?
a) no additional
b) less
c) more
d) reversed

Answer 19

c) more

Question 20

Which of the following pulse sequences requires a higher duty cycle per TR period?
a) conventional SE
b) FSE 32 ETL
c) Fast GRE
d) Conventional GRE

Answer 20

c) Fast GRE

Question 21

An Arnold-Chiari malformation is best demonstrated in which of the following?
a) Sagittal LSP
b) Sagittal brain
c) Coronal abdomen
d) Sagittal pelvis

Answer 21

b) Sagittal brain

Question 22

Which two imaging planes best demonstrate the knee menisci?
a) Axial and coronal
b) Coronal and Sagittal
c) Sagittal and axial

Answer 22

b) Coronal and Sagittal

Question 23

In which area of the ankle is the peroneal tendon located?
a) anterolateral
b) posterolateral
c) posteromedial
d) anteromedial

Answer 23

b) posterolateral

Question 24

An acute occult fracture of the scaphoid will apear
a) Hyperintense on T1 and STIR images
b) Hypointense on T1 and STIR images
c) Hyperintense on T1 and hypointense on STIR
d) Hypointense on T1 and hyperintense on STIR

Answer 24

d) Hypointense on T1 and hyperintense on STIR