Procedures- Neck And Contrast Media

Question 1

Why would a precontrast exam of the neck be performed?

Answer 1

R/o suspicious mass or to identify salivary gland calculi

Question 2

Should most ct exams of the neck be performed with contrast media?

Answer 2

Yes

Question 3

What structures are more enhanced due to contrast media for ct of the neck?

Answer 3

Lymph nodes, tumors and vasculature

Question 4

What factors does the volume of contrast media administered account for?

Answer 4

Clinical indications, CT system capabilities, and patient physiologic factors

Question 5

What is the contrast media range for a ct soft tissue neck?

Answer 5

50-150mL

Question 6

What is the injection rate for a ct scan of the soft tissue neck with contrast?

Answer 6

1-3mL/sec

Question 7

What is the delay time for a ct soft tissue neck with contrast?

Answer 7

30-60 seconds

Question 8

Where should contrast not be if the scan delay for a ct soft tissue neck is sufficient amount of time?

Answer 8

Thoracic inlet

Question 9

What anatomical structure is hyper dense on CT because of its inherent iodine content?

Answer 9

Thyroid gland

Question 10

What is the primary reason for a CTA of the neck?

Answer 10

Carotid arteries

Question 11

What are indications for CTA of the carotids?

Answer 11

Stenosis
Occlusion
Aneurysm
Trauma

Question 12

What scan acquisition is used in CTA of the carotids?

Answer 12

Helical

Question 13

What size slice thickness is used for a CTA neck?

Answer 13

Thin (0.5-1.5mm)

Question 14

What direction is a CTA carotid scanned?

Answer 14

Caudocranial

Question 15

What is the typical scan range for a CTA carotid?

Answer 15

Aortic arch through skull base

Question 16

What’s the typical mA range for a CT carotid scan?

Answer 16

300-400mA

Question 17

What kVp range is used in CTA carotids to improve the visualization of vessel opacification?

Answer 17

80-100kvp

Question 18

What is the typical injection rate of IV contrast for a CTA spiral acquisition of the carotids?

Answer 18

3-4mL/sec

Question 19

Which arm is preferred to inject contrast media into for a CTA carotid to prevent peri-venous streak artifact from dense contrast in the left vasculature?

Answer 19

Right arm

Question 20

What is the empirical delay for a CTA carotid exam?

Answer 20

15-18 seconds

Question 21

How much overlap of thin sections are reconstructed to maximize quality of MPR and 3D images?

Answer 21

50%

Question 22

What is the amount of contrast administered for a CTA neck on a 64 slice scanner?

Answer 22

50-75mL

Question 23

What is the CM injection rate for a CTA neck on a 64 slice scanner?

Answer 23

4mL/sec

Question 24

What scan delay is appropriate for a CTA neck on a 64 slice scanner?

Answer 24

12-15seconds

Question 25

What scan acquisition is used and collimation size obtained on a 64 slice scanner for a CTA neck?

Answer 25

Helical and 0.625mm

Question 26

What kvp range is necessary for a CTA neck on a 64 slice scanner?

Answer 26

80-120kvp

Question 27

What is the mas range for a CTA neck on a 64 slice scanner?

Answer 27

350mA/0.8sec

Question 28

What is the overlap of source images that are reformatted into MPR, MIP and volume-rendered for a CTA neck on a 64 slice scanner?

Answer 28

0.75mm x 0.5mm