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

CT Application 3 Chest + Lung Flashcards

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

A

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

22
Q

delay timing for CT thorax/lung

A

1 min after IV injection

23
Q

reconstruction orientation for CT thorax/lung

A

axial & coronal (mediastinum & lung window)

24
Q

parameters for CT thorax/lung

A
  • rehearse breathing
  • ACTM & kVP selection when scanning
  • thin slice acquisition 1mm for HRCT
25
Q

rationale for mediastinum algorithm in CT thorax/lung

A
  • smoother images
  • good contrast
  • maximise SSTM resolution
26
Q

rationale for lung algorithm in CT thorax/lung

A
  • good contrast
  • sharper images
  • optimal spatial resolution
27
Q

WW/WL for mediastinal algorithm

A

350/40

28
Q

WW/WL for lung algorithm

A

1600/-400

29
Q

WW/WL for bone algorithm

A

2500/500

30
Q

2 types of lung cancer

A
  1. small cell lung cancer
  2. non-small cell lung cancer
31
Q

___ is the most common site of metastasis from primary tumor

A

lungs

32
Q

HRCT is important because to determine ___

A
  • differential diagnosis for interstitial lung disease
  • detect lung disease in symptomatic patients with normal CXR
33
Q

interstitial lung disease

A

diseases that cause lung scarring (fibrosis) and are irreversible

34
Q

what are ground glass opacities indicative of

A
  • Filling of the alveolar spaces with pus, edema, hemorrhage, inflammation or tumor cells
  • thickening interstitium or alveolar walls
35
Q

lung consolidation

A

when air that usually fills small airways in lungs is replaced with something else

36
Q

identifier for centrilobular nodules

A

dilated and impacted centrilobular bronchioles as indicated by tree-in-bud appearance

37
Q

what is bronchiectasis

A

localized bronchial dilatation as seen with
- signet ring sign
- bronchial wall thickening

38
Q

what is lung atelectasis

A

collapse / incomplete expansion of pulmonary parenchyma due to alveoli collapse

39
Q

HRCT is often performed while patient is lying ___

A

supine

40
Q

why should patients suspected of lung collapse or atelectasis be imaged supine

A

opacities are seen more clearly on dependent portions of lungs which are resolved if done prone

41
Q

indications of HRCT scan technique

A

detect diseases affecting pulmonary parenchyma and airways

42
Q

scan range of HRCT scan technique

A

apex to base of lungs

43
Q

why is inspiration & expiration done for HRCT scan technique

A

to recognise air trapping which indicates small airway obstruction

44
Q

rationale for mediastinum algorithm

A
  • smoother images to maximise SSTM resolution
  • good contrast
45
Q

rationale for lung window & sharp algorithm

A
  • sharper images for better spatial resolution
  • good contrast
46
Q

WW/WL for lung window & sharp

A

1600/-400

47
Q

WW/WL for mediastinum algorithm

A

350/-40

48
Q

slice thickness & interval for mediastinum algorithm

A

3/3 mm

49
Q

slice thickness & interval for lung window algorithm

A

3/3 mm

50
Q

slice thickness & interval for lung sharp algorithm

A

1/10 mm

CT & MRI (12 decks)

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