Uro Radiology

Question 1

CT scan HU

Answer 1

Air -1000HU
fat -20 to-100
Water 0
Muscle 40
Acute bleed 30-45
Clotted blood >60
Bone 400-1200
Metal >1500

Question 2

How does MRI work

Answer 2

Magnet used to align protons H+
Radio frequency added -electromagnetic field alters alignment of protons
-receiver coil measures changes
-computer generated image created

Question 3

MRI T weighted

Answer 3

T1 - water is dark fat is bright

T2 - water is bright and fat is dark
(Look at CSF it will be white)