CT

Question 1

What are the different hounsfield units

Answer 1

Air = -1000

Lungs = -700

Fat = -70

Water = 0

CSF = 8

White matter = 30

Grey matter = 45

Blood = 70

Bone = 1000

Question 2

Clinical indications for a CT head

Answer 2

Vomiting

Suspected open skull #

Post seizure

GCS of less than 13

Sign of base of skull # (bleeding out of nose or ears)

Question 3

Benefits of using Ct

Answer 3

Good visualisation of bony anatomy - high resolution

Multi planar recons

3D reformatting

Data can show lung fields soft tissue and bone

Question 4

3 phases used for a urogram

Answer 4

Plain phase - rules out stones

Portal venous phase - to visualise kidneys

Delay phase - assessing the bladder