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CT & MRI > CT Application 3 Chest + Lung > Flashcards

CT Application 3 Chest + Lung Flashcards

(50 cards)

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1
Q

role of CT in thorax/lung diseases

A
  • diagnosis
  • therapy & management
  • emergency role
  • research
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2
Q

possible CT thorax/lung applications

A

non-contrast CT exam = low dose screening + HRCT

contrast CT exam

RT Planning

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3
Q

what phase is used for CT thorax/lung

A

venous phase

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4
Q

what cannula is used for CT thorax/lung

A

22G

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5
Q

what rate is used for CT thorax/lung

A

1.5ml/s

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6
Q

what contrast volume is used for CT thorax/lung

A

50 ml of IV CT contrast

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7
Q

what phase is used for CT thorax/lung

A

respiratory gating

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8
Q

what rate is used for CT thorax/lung

A

1.5ml/s

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9
Q

what cannula is used for CT thorax/lung

A

22G

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10
Q

what contrast volume is used for CT thorax/lung

A

50 ml of IV CT Contrast

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11
Q

scan range for routine CT thorax/lung with contrast

A

lung apex to adrenals

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12
Q

scan range for low dose screening CT thorax/lung or without contrast

A

lung apex to adrenals or diaphragm

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13
Q

scan range for HRCT

A

lung apex to diaphragm

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14
Q

scan range for RT planning

A

whole lung/chest

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15
Q

what should u be mindful of for contrast studies

A
  1. previous drug/contrast allergy
  2. serum creatinine and eGFR
  3. diabetes mellitus and metformin
  4. IV access, chest ports, PICC
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16
Q

importance of serum creatinine and eGFR

A

renal insufficiency

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17
Q

patient position for CT lung/thorax

A

patient supine/prone with arms above head; head or feet in first

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18
Q

considerations for pediatric CT imaging

A

isocentre, dose, pitch

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19
Q

recon window for CT thorax/lung

A

mediastinum, bone, lung

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20
Q

slice thickness & interval for CT thorax/lung

A

3-5 mm

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21
Q

IV injection rate for CT thorax/lung

Study These Flashcards
A

50 - 60 mL IVCT contrast @ 1.2 - 2 ml/s

22
Q

delay timing for CT thorax/lung

Study These Flashcards
A

1 min after IV injection

23
Q

reconstruction orientation for CT thorax/lung

Study These Flashcards
A

axial & coronal (mediastinum & lung window)

24
Q

parameters for CT thorax/lung

Study These Flashcards
A
  • rehearse breathing
  • ACTM & kVP selection when scanning
  • thin slice acquisition 1mm for HRCT
25
rationale for mediastinum algorithm in CT thorax/lung
- smoother images - good contrast - maximise SSTM resolution
26
rationale for lung algorithm in CT thorax/lung
- good contrast - sharper images - optimal spatial resolution
27
WW/WL for mediastinal algorithm
350/40
28
WW/WL for lung algorithm
1600/-400
29
WW/WL for bone algorithm
2500/500
30
2 types of lung cancer
1. small cell lung cancer 2. non-small cell lung cancer
31
___ is the most common site of metastasis from primary tumor
lungs
32
HRCT is important because to determine ___
- differential diagnosis for interstitial lung disease - detect lung disease in symptomatic patients with normal CXR
33
interstitial lung disease
diseases that cause lung scarring (fibrosis) and are irreversible
34
what are ground glass opacities indicative of
- Filling of the alveolar spaces with pus, edema, hemorrhage, inflammation or tumor cells - thickening interstitium or alveolar walls
35
lung consolidation
when air that usually fills small airways in lungs is replaced with something else
36
identifier for centrilobular nodules
dilated and impacted centrilobular bronchioles as indicated by tree-in-bud appearance
37
what is bronchiectasis
localized bronchial dilatation as seen with - signet ring sign - bronchial wall thickening
38
what is lung atelectasis
collapse / incomplete expansion of pulmonary parenchyma due to alveoli collapse
39
HRCT is often performed while patient is lying ___
supine
40
why should patients suspected of lung collapse or atelectasis be imaged supine
opacities are seen more clearly on dependent portions of lungs which are resolved if done prone
41
indications of HRCT scan technique
detect diseases affecting pulmonary parenchyma and airways
42
scan range of HRCT scan technique
apex to base of lungs
43
why is inspiration & expiration done for HRCT scan technique
to recognise air trapping which indicates small airway obstruction
44
rationale for mediastinum algorithm
- smoother images to maximise SSTM resolution - good contrast
45
rationale for lung window & sharp algorithm
- sharper images for better spatial resolution - good contrast
46
WW/WL for lung window & sharp
1600/-400
47
WW/WL for mediastinum algorithm
350/-40
48
slice thickness & interval for mediastinum algorithm
3/3 mm
49
slice thickness & interval for lung window algorithm
3/3 mm
50
slice thickness & interval for lung sharp algorithm
1/10 mm

CT & MRI (12 decks)

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