Imaging Procedures NECK Flashcards
What field of view do you include in a soft tissue scan of the neck?
Superior orbital rim to lung apex
How do you avoid streaking artifact in a Neck CT
2 parts
SCAN From:
[superior orbital rim —> hard palate]
Angle gantry superiorly, and parallel to the hard pallet
[hard pallet —> lung apex]
acquired parallel to mandibular body
*its ok for these two images to overlap to ensure full capture of the back of the head *
What can cause streaking artifact in a neck CT
dental harware
True/ False . During Neck CT arms are above the head.
False
What does ATCM stand for ?
Automatic Tube Current Modulation
Will ATCM increase or decrease the mA’s during scanning as it moves from the neck to the thoracic inlet (chest)?
If your machine does not have ATCM programmed into the hardware should you adjust it manually or leave it be?
increase
adjust manually
Normally, How thick are the slices in neck CT’s?
if you want a better visualization of the larynx or neck vasculature how thin should they be?
3- 5 mm
0.5 - 2 mm
What size SFOV do you want to use when imaging the neck
medium to large
True/ False
DFOV value remains fixed no matter the patient size
false. it ranges from 18- 25cm in length and should be adjusted based on pateint size
True/False . It is ok for patient to swallow during soft tissue neck acquisition
false
Indications for a CT neck
- swollen glands
- cysts/ lipomas/ abscess
- lymphadenopathy
- trauma
- thyroid/ parathyroid diseases
- malignant growths
For optimal imaging of the neck what should the soft tissue and bone window settings be
Soft tissue
WL: 30 WW: 400
Bone
WL 300 WW 2000
When imaging the larynx, how is the patient positioned? how is the gantry?
laying supine. head extended
gantry angled parallel to true vocal cords
What field of view do you scan to image the larynx
hyoid bone (top neck) ---> cricoid cartilage (bottom neck)
True/ false. Holding your breath during larynx scan improves visualization of true vocal cords
true
What is phonation?
What does it contribute when it comes to CT?
the production or utterance of speech sounds
helps to see abnormal movement in vocal cords
What’s the next scan sequence after initial acquisition during quiet breathing? [Larynx scan]
scanning while patient phonates and “EEE” sound
How does a wide window setting help when visualizing the larynx?
separates small vocal structures from the endo-larynx
What are the technical parameters for a wide window setting (ie.. WL & WW)
WL -300 WW 1000
The amount of contrast media used in a Neck CT ranges from :
50- 150 mL
True/ False . Contrast should be used in most neck CT to better visualize underlying structures if otherwise contraindicated
true
True/ false . The use of contrast makes no difference in visualizing soft tissue structures in the neck
false
What does a non contrast CT of the neck show us
enlargement of masses , or identifying salivary stones
Salivary calculi are also known as….
salivary stones
