Special Procedures

Question 1

What is another term for a Peripheral CTA? What anatomy is included?

Answer 1

also called a “CT runoff”. assesses the peripheral arterial tree from the renal arteries through the feet

Question 2

The aorta bifurcates at what vertebral level? What does it bifurcate into?

Answer 2

at the level of L4. it splits into the right and left common iliac arteries

Question 3

The common iliac arteries bifurcate at what vertebral level? What do they bifurcate into?

Answer 3

at the level of L5-S1. they each split into internal and external iliac arteries

Question 4

What is contrast media transit time?

Answer 4

the time it takes for contrast to travel to the aorta

Question 5

What is the contrast media transit time for a patient with a vascular disease?

Answer 5

it ranges from 12-40 seconds

Question 6

What is the formula used to figure out scan time for a Peripheral CTA?

Answer 6

bolus duration = scan time - 5 seconds

this allows the scanner to keep pace with the contrast as it travels down through the peripheral arteries

Question 7

What anatomy are included for a Peripheral CTA?

Answer 7

from above the diaphragm to below the ankles

Question 8

What is the primary indication for a Peripheral CTA?

Answer 8

peripheral artery disease

Question 9

What is claudication? What causes it?

Answer 9

cramping pain in the legs. arterial stenosis and occlusion cause poor circulation which lead to pain

Question 10

What is CT-guided RFA? How does it work?

Answer 10

CT-guided radiofrequency ablation places a probe into a tumor using CT guidance. Once placed, the probe emits radiofrequencies to heat and destroy the tumor

Question 11

What type of contrast is iopamidol?

Answer 11

non-ionic. (Isovue 370)

Question 12

The normal platelet count range for an adult is:

Answer 12

140,000-440,000/mL of blood