Brainscape's Knowledge GenomeTM

Browse over 1 million classes created by top students, professors, publishers, and experts.


See full index

CT Imaging Procedures > Cranial & Facial Imaging (12) > Flashcards

Cranial & Facial Imaging (12) Flashcards

1
Q

Routine CT Head: Indications (10)

A

Stroke-initial eval
Headache
Vertigo
Seizures
Unresponsive
Confusion
Neurological Concerns
Mental Status Change
Trauma/Fractures/hemorrhagic strokes (bleeds) best visualized w/o contrast
General Survey

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

Routine CT Head: Scan Type

A

Axial most common; helical and volume scans increasing in use

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

Routine CT Head: Slice Parameters

A

2.5mm slice thickness through posterior fossa
5mm through vertex w/matching slice interval
Brain & cranium should always be eval’d w 5mm or less thickness

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

Routine CT Head: Gantry Tilt

A

Parallel to supra-orbital-meatal line to avoid lens of eye

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

Routine CT Head: w/Contrast (performed as: )

A

Done when MRI contraindicated (done as Routine CT Head WWO)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

Routine CT Head: when MRI is preferred

A

For imaging mass (soft tissue pathologies)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

Routine CT Head: Algorithm

A

Standard: 80/30
Bone: 2500/600

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

Routine CT Head: HU for blood (range)

A

30-45 HU

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

Routine CT Head: HU for brain

A

20 HU

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

Routine CT Head: Utility of Brain window (80/30)

A

Supressed image noise
Creates smoother image

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

Routine CT Head: Smoothing Algorithm is used in Volume (3D) Rendering bcuz

A

Bone 2500/600 creates too much image noise in 3D

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

CT Orbits: Indications (3+)

A

Proptosis (eye bulging)
Pain
Vision changes
Other abnormalities

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

CT Orbits: Scan Type

A

Helical

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

CT Orbits: Slice Parameters

A

1.25mm with matching interval

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

CT Orbits: Gantry Tilt

A

Parallel to hard palate

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

CT Orbits: Contrast
Timing
(_______ for trauma)

A

IV contrast: 60 s post-injection
(Non-Con for trauma)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
17
Q

CT Orbits: Algorithm

A

Standard: 400/40
Bone: 2500/600

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
18
Q

CT Orbits: Reformations

A

Coronal/Sagittal in both Std/Bone

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
19
Q

CT Orbits-Imaging for trauma: Most likely course of action

A

Convert to CT Facial Bones
(orbits-only rare d/t likelihood of other areas being injured if orbits are injured)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
20
Q

CT Orbits w/Contrast Indication (1+)

A

Infection
Other soft tissue concerns

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
21
Q

CT Orbits: Utility of standard WL

A

(40)
Matches approx HU of tissue in/around eyes

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
22
Q

Bone Window: Max visibility of bone

A

2500 HU

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
23
Q

CT Facial Bones: Indications (4+)

A

Facial trauma (most common)
Facial abscess (esp dental)
Mass
Swelling
Other Abnormalities

24
Q

CT Facial Bones: Scan Type

A

Helical

25
Q

CT Facial Bones: Slice Parameters

A

1.25 mm with matching interval

26
Q

CT Facial Bones: Gantry Tilt (1)

A

Parallel to hard palate

27
Q

CT Facial Bones: Contrast
Timing
(_______for trauma)

A

IV contrast: 45s post inj
(NonCon for trauma)

28
Q

CT Facial Bones: Algorithm

A

Standard: 400/40
Bone: 2500/600

29
Q

CT Facial Bones: Typical Reformats

A

Coronal/Sagittal in Standard/Bone

30
Q

CT Facial Bones: FOV lower limit

A

Includes entire mandible

31
Q

CT Sinuses: FOV

A

Similar to facial bones but does not include mandible

32
Q

CT Sinuses: Indications (2+)

A

Sinusitis
Sinus Pn
Etc

33
Q

CT Sinuses: Scan Type

A

Helical

34
Q

CT Sinuses: Slice Parameters

A

3.75mm w/matching interval

35
Q

CT Sinuses: Gantry Tilt

A

Perpendicular to hard palate (for direct coronal)

36
Q

CT Sinuses: Non Con vs W Con

A

None
If suspected mass: should convert to CT Facial Bones w/Contrast

37
Q

CT Sinus: Direct Coronal Utility

A

Allows better visualization of air-fluid levels in sinuses

38
Q

CT Sinus: Algorithm

A

Bone: 2500/600

39
Q

CT Sinus: FOV

A

All Sinuses
Mastoid Air Cells

40
Q

CT Sinus: Most common indication

A

Acute/Chronic Sinusitis

41
Q

CT Sinus: Acute sinusitis presentation

A

Clear fluid-levels in sinuses, esp maxillary

42
Q

CT Sinus: Chronic sinusitis presentation

A

mucosal thickening w/out definite air-fluid level

43
Q

CT Temporal Bones: purpose

A

Identify tiny changes in mastoid air cells, IAC, inner ear

44
Q

IAC

A

Internal Auditory Canal

45
Q

CT Temporal Bones: Patient positioning

A

Direct Coronal

46
Q

CT Temporal Bones: Indications (3+)

A

Pain
Ataxia
Hearing Loss
Etc

47
Q

Ataxia

A

Lack of coordination

48
Q

CT Temporal Bones: Scan Type

A

Helical

49
Q

CT Temporal Bones: Slice Parameters

A

0.625mm slice
0.315 slice interval
(Result: overlapping slices/ultra-high spatial res)

50
Q

CT Temporal Bones: Gantry Tilt

A

Perpendicular to hard palate if direct-coronal
Parallel to hard palate if supine

51
Q

CT Temporal Bones: Contrast

A

None

52
Q

CT Temporal Bones: Algorithm

A

Bone: 2500/600

53
Q

CT Temporal Bones: FOV

A

All sinuses
Mastoid Air Cells

54
Q

Routine CT Head: _______ helps prevent blocky appearance in Volume (3D) Rendering

A

Thin slices w/overlapping Interval

55
Q

approx HU of bone

A

600 HU

56
Q

Course of action if CT Sinus is ordered for suspected mass

A

Convert to CT Facial Bones w/Contrast

CT Imaging Procedures (11 decks)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2024 Bold Learning Solutions. Terms and Conditions