Computed Tomography (CT) - QUIZ

Question 1

Match the tissues to their density (lowest to highest Hounsfield Units).
Match the tissues to their density (lowest to highest Hounsfield Units).

a) Air
b) Acute blood
c) Water
d) Fat
e) Bone

Answer 1

a) Air (-1000)
d) Fat (-30 to -70)
c) Water (0)
b) Acute blood (+60 to +100)
e) Bone (+1000)

Question 2

The CT head shows all of the following, except?

a) Effacement of sulci (sign of high ICP)
b) Subdural hematoma
c) Midline shift
d) Epidural hematoma

Answer 2

c) Midline shift

Question 3

Name the numbered anatomical structures on this chest CT.

Answer 3

1) Scapula
2) Heart
3) Right lung
4) Left lung
5) ribs

Question 4

In this hemodynamically unstable patient, what is your first intervention after seeing this CT?

a) Left needle thoracostomy
b) Start blood transfusion
c) Pericardiocentesis
d) Mechanical ventilation with high PEEP
e) Intubation

Answer 4

a) Left needle thoracostomy

Question 5

Name the numbered anatomical structures on this abdominal CT.

Answer 5

1) Spleen
2) Liver
3) Lumbar vertebra
4) Kidney
5) Abdominal wall

Question 6

This is a CT of a motorcyclist hit by a car. What injury does the abdominal CT show?

a) Penetration of the abdominal wall
b) Splenic laceration
c) Liver laceration
d) Kidney laceration
e) Lumbar vertebra fracture

Answer 6

d) Kidney laceration

Question 7

What is the most accurate description of this CT of the thoraco-lumbar spine?

a) There is significant anterior displacement of L1 compared to L2
b) The mechanism of injury is unlikely to be axial loading
c) This is a burst fracture
d) There is no risk of spinal cord injury
e) Normal CT

Answer 7

c) This is a burst fracture