DIFFUSION

Question 1

What term is used to describe the net displacement of diffusion spins across a tissue?

A. Apparent diffusion coefficient (ADC)
B. T2 shine through
C. DWI
D. T2*

Answer 1

A. Apparent diffusion coefficient (ADC)

Question 2

What are the units for this parameter ?
A. HtZ
B. mm
C. mm squared /s
D. mms

Answer 2

C. mm squared /s

Question 3

What is the extrinsic parameter that controls the amount of diffusion seen in an image?
A. b factor or value
B. DWI unit
C. ADC

Answer 3

A. b Factor or value

Question 4

How is b factor or value defined?
A. X gradient cycle
B. Duty cycle
C. Rise time
D. The duration, amplitude and interval of the sensitizing gradients

Answer 4

D. The duration, amplitude and interval of the sensitizing gradients

Question 5

What signal intensity in an area of abnormality likely to have on an ADC map?
A. Hyperintense
B. Hypointense
C. Isointense

Answer 5

B. Hypointense

Question 6

What signal intensity in an area of abnormality likely to have on a trace image?

A. Hypointense
B. Hyperintense
C. Isointense

Answer 6

B. Hyperintense

Question 8

What is the type of imaging where individual slices are selectively excited ?

A. 2D
B. 3D
C. MRA

Answer 8

A. 2D