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Mosby CT review > Imaging Procedures NECK > Flashcards

Imaging Procedures NECK Flashcards

1
Q

What field of view do you include in a soft tissue scan of the neck?

A

Superior orbital rim to lung apex

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2
Q

How do you avoid streaking artifact in a Neck CT

2 parts

A

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 *

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3
Q

What can cause streaking artifact in a neck CT

A

dental harware

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4
Q

True/ False . During Neck CT arms are above the head.

A

False

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5
Q

What does ATCM stand for ?

A

Automatic Tube Current Modulation

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6
Q

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?

A

increase

adjust manually

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7
Q

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?

A

3- 5 mm

0.5 - 2 mm

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8
Q

What size SFOV do you want to use when imaging the neck

A

medium to large

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9
Q

True/ False

DFOV value remains fixed no matter the patient size

A

false. it ranges from 18- 25cm in length and should be adjusted based on pateint size

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10
Q

True/False . It is ok for patient to swallow during soft tissue neck acquisition

A

false

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11
Q

Indications for a CT neck

A
  • swollen glands
  • cysts/ lipomas/ abscess
  • lymphadenopathy
  • trauma
  • thyroid/ parathyroid diseases
  • malignant growths
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12
Q

For optimal imaging of the neck what should the soft tissue and bone window settings be

A

Soft tissue
WL: 30 WW: 400

Bone
WL 300 WW 2000

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13
Q

When imaging the larynx, how is the patient positioned? how is the gantry?

A

laying supine. head extended

gantry angled parallel to true vocal cords

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14
Q

What field of view do you scan to image the larynx

A 
hyoid bone (top neck)    
  ---> cricoid cartilage (bottom neck)
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15
Q

True/ false. Holding your breath during larynx scan improves visualization of true vocal cords

A

true

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16
Q

What is phonation?

What does it contribute when it comes to CT?

A

the production or utterance of speech sounds

helps to see abnormal movement in vocal cords

17
Q

What’s the next scan sequence after initial acquisition during quiet breathing? [Larynx scan]

A

scanning while patient phonates and “EEE” sound

18
Q

How does a wide window setting help when visualizing the larynx?

A

separates small vocal structures from the endo-larynx

19
Q

What are the technical parameters for a wide window setting (ie.. WL & WW)

A

WL -300 WW 1000

20
Q

The amount of contrast media used in a Neck CT ranges from :

A

50- 150 mL

21
Q

True/ False . Contrast should be used in most neck CT to better visualize underlying structures if otherwise contraindicated

A

true

22
Q

True/ false . The use of contrast makes no difference in visualizing soft tissue structures in the neck

A

false

23
Q

What does a non contrast CT of the neck show us

A

enlargement of masses , or identifying salivary stones

24
Q

Salivary calculi are also known as….

A

salivary stones

25
Q

contrast is injected at what rate for a soft tissue neck ?

A

1-3 mL

26
Q

during a contrast neck ct the delay scan should take place after how many seconds

what is the purpose of the delay in a contrast neck ct

A

30-60 sec

avoids image degradation from the contarst that reaches subclavian vein

27
Q

Why does the thyroid appear very dense on a contrast CT

A

because it naturally has a lot of iodine in it and the [C] increases upon contrast admin

28
Q

true / false. You can not divide the bolus injection for a soft tissue neck ct

A

false

29
Q

CTAs of the neck is used primarily to evaluate what structures

A

carotid arteries

30
Q

Indications for neck CTA

A
  • narrowing
  • blockage
  • weakening or bulging artery
  • trauma
31
Q

True/ false .Neck CTAs are performed craniocaudal

A

false

32
Q

What field of view do you scan from to complete a NECK CTA

If the doctor wants to see the circle of willis in the neck CT aswell what should the field of be extended to

A

aortic arch to base of skull

dorsum sella ( 1 cm above it )

33
Q

Does it mater which arm we bolus inject the contrast for a neck CT ?

A

Yes. prefer to use right arm to avoid peri venous streaking artifact in vasculature in the left side

34
Q

What rate is contrast injected for a CTA neck?

A

3-4 mL/ sec

35
Q

Why should the mA settings be kept at its minimal setting

What is the range of that minimal setting

A

to reduce patient dose

300-400 mA

36
Q

Why would you want to keep a reduced kVP setting ?

What is that range ?

A

to see opacified structures better

80 - 100 kVP

37
Q

Which one of these are called “source “ images?

axial
coronal
sagittal
obliques

A

axial

38
Q

proper timing during a CTA neck can be ensured by the following techniques:

A
  • implementing a bolus timing sequence for multiple images obtained during that acquisition
  • using bolus tracking software
  • 15 to 18 second delay

Mosby CT review (8 decks)

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