CAL: CT v MRI

Question 1

How can CT and MRI be distinguished?

Answer 1

> CT bones white like radiographs, mRI bone is black

> CT fat darker (cf. kidneys and soft tissue) MRI fat hyperintense if T1W

Question 2

What is CT brightness density measured in?

Answer 2

• Hounsefield units
• can be altered to best show different structures (bone v soft tissue)
  > Brain window = 0-80 HU (bone out of range)
  > Bone window =

Question 3

How many vertebrae of each section do dogs and horses have?

Answer 3

> dog
C - 7
T - 13
L - 7
S - 3
> horse
C - 7
T - 18
L - 6
S - 5

Question 4

Is mild lumbosacral disk degeneration pathological?

Answer 4

• yes but in large breed dogs may be age related change and not prompt immediate tx