Procedures- Neck And Contrast Media Flashcards
Why would a precontrast exam of the neck be performed?
R/o suspicious mass or to identify salivary gland calculi
Should most ct exams of the neck be performed with contrast media?
Yes
What structures are more enhanced due to contrast media for ct of the neck?
Lymph nodes, tumors and vasculature
What factors does the volume of contrast media administered account for?
Clinical indications, CT system capabilities, and patient physiologic factors
What is the contrast media range for a ct soft tissue neck?
50-150mL
What is the injection rate for a ct scan of the soft tissue neck with contrast?
1-3mL/sec
What is the delay time for a ct soft tissue neck with contrast?
30-60 seconds
Where should contrast not be if the scan delay for a ct soft tissue neck is sufficient amount of time?
Thoracic inlet
What anatomical structure is hyper dense on CT because of its inherent iodine content?
Thyroid gland
What is the primary reason for a CTA of the neck?
Carotid arteries
What are indications for CTA of the carotids?
Stenosis
Occlusion
Aneurysm
Trauma
What scan acquisition is used in CTA of the carotids?
Helical
What size slice thickness is used for a CTA neck?
Thin (0.5-1.5mm)
What direction is a CTA carotid scanned?
Caudocranial
What is the typical scan range for a CTA carotid?
Aortic arch through skull base
What’s the typical mA range for a CT carotid scan?
300-400mA
What kVp range is used in CTA carotids to improve the visualization of vessel opacification?
80-100kvp
What is the typical injection rate of IV contrast for a CTA spiral acquisition of the carotids?
3-4mL/sec
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?
Right arm
What is the empirical delay for a CTA carotid exam?
15-18 seconds
How much overlap of thin sections are reconstructed to maximize quality of MPR and 3D images?
50%
What is the amount of contrast administered for a CTA neck on a 64 slice scanner?
50-75mL
What is the CM injection rate for a CTA neck on a 64 slice scanner?
4mL/sec
What scan delay is appropriate for a CTA neck on a 64 slice scanner?
12-15seconds
What scan acquisition is used and collimation size obtained on a 64 slice scanner for a CTA neck?
Helical and 0.625mm
What kvp range is necessary for a CTA neck on a 64 slice scanner?
80-120kvp
What is the mas range for a CTA neck on a 64 slice scanner?
350mA/0.8sec
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?
0.75mm x 0.5mm
