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CT Registry > Imaging Procedures > Flashcards

Imaging Procedures Flashcards

1
Q

Gray / white matter Window

A

100 / 35

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2
Q

Hemorrhage / hematoma Window

A

150 / 75

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3
Q

Acute ischemia Window

A

25 / 35

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4
Q

Brain CTA Landmark

A

C2 through at least 1 cm above dorsum sella

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5
Q

Brain CTA Scan delay (when BT is not used)

A

12 - 20 sec

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6
Q

Acute Stroke Protocol

A

1) Precontrast head CT
2) CTA of the brain and carotid arteries
3) CT perfusion (CTP) imaging

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7
Q

Cerebral blood volume (CBV)

A

4 - 5 mL/100g

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8
Q

Cerebral blood flow (CBF)

A

50 - 60 mL/100g/min

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9
Q

Mean transit time (MTT)

A

Varies

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10
Q

CBF Formula

A

CBV / MTT

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11
Q

Mathematical technique for generation of perfusion maps

A

Deconvolution

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12
Q

Soft tissue neck Landmark

A

Superior orbital rim through lung apex

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13
Q

Larynx Landmark

A

Just above hyoid through cricoid cartilage

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14
Q

Soft tissue neck Scan delay

A

30 - 60 sec

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15
Q

Carotid CTA Landmark

A

Aortic arch through skull base

For COW, through at least 1 cm above dorsum sella

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16
Q

Carotid CTA Scan delay (when BT is not used)

A

15 - 18 sec

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17
Q

CTPA Scan delay (when BT is not used)

A

20 - 25 sec

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18
Q

CAC Score

A

1 to 10: Minimal
11 to 100: Mild
101 to 400: Moderate
>400: Extensive

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19
Q

Main branches of RCA

A
  • Conus artery
  • Sinus node artery
  • Right atrial branches
  • Right ventricular branches
  • Posterior descending artery (PDA) aka posterior interventricular artery (PIV)
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20
Q

Main branches of LCA

A
  • Left anterior descending artery (LAD)

- Left circumflex artery (LCX)

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21
Q

CAC Landmark

A

Aortic arch through cardiac base

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22
Q

CCTA Landmark

A

Carina through base of heart

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23
Q

CTA Aorta Landmark

A

Base of neck through celiac trunk

May extend superiorly to include carotid arteries or inferiorly through bifurcation and iliac arteries

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24
Q

Right arm

A

Carotid CTA, CTA Aorta

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25
Q

“Triple rule-out” MDCT Procedure

A
  • CCTA for coronary artery disease
  • CTA of the aorta for aneurysm
  • CTA of the pulmonary arteries for embolism
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26
Q

CT density of normal hepatic parenchyma

A

45 to 65 HU

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27
Q

CT density of Spleen

A

about 10 HU less than liver

28
Q

CT density Adrenal glands

A

25 to 40 HU

29
Q

Example of Liver CT

A

1) Non con
2) Early arterial phase
3) Arterial phase
3) Portal venous phase
4) Delayed phase

30
Q

Preferred timing for Spleen CT

A

Portal venous phase (60-70 sec), more homogeneous

31
Q

Example of Pancreas CT

A

Water as oral contrast

1) Non con
2) Arterial phase
3) Pancreatic (delayed arterial) phase
4) Venous phase

32
Q

Example of Adrenal glands CT

A

1) Non con
2) Portal venous phase
3) Delayed phase

33
Q

Sheath of connective tissue that enveloped and supports kidneys

A

Gerota’s fascia

34
Q

Epithelial lining for urinary tract

A

Urothelium

35
Q

Genitourinary system Landmark

A

Above kidneys through base of bladder

May include above diaphragm

36
Q

Example of Kidney and Urinary tract CT

A

Water or positive oral contrast

1) Non con
2) Arterial phase
3) Corticomedullary (delayed arterial) phase
4) Nephrographic phase
5) Excretory phase

37
Q

GI system Landmark

A

Above diaphragm through pubis symphysis

May begin higher for esophageal pathology

38
Q

Duodenum is suspended from the diaphragm by:

A

Ligament of Treitz

39
Q

CTA Aorta (Body) Landmark

A

Above the arch through common iliac arteries

40
Q

Bowel cleansing agents

A

Polyethylene glycol and Magnesium citrate

41
Q

Spinal cord tapers into the:

A

Conus medullaris

42
Q

Nerve bundle extending inferiorly from the spinal cord

A

Cauda equina

43
Q

Primary goal of CTP

A

Identify and differentiate infarct core and penumbra (evaluation of acute stroke)

44
Q

Uses water for oral contrast

A
  • Pancreas
  • Biliary
  • Kidneys and urinary tract (positive contrast may be used)
  • CTA Aorta (Body)
45
Q

Peripheral CTA (Runoff) Landmark

A

Just below diaphragm to below ankles

46
Q

FDG dose

A

10 - 15 millicuries (mCi)

47
Q

Least heart motion occurs from approximately:

A

55 - 77% of the R-R interval

48
Q

Peritoneum

A
  • Stomach
  • Small bowel (only part of duodenum)
  • Transverse colon
  • Liver and gallbladder
  • Spleen
  • Ovaries
49
Q

Retroperitoneum

A
  • Duodenum
  • Pancreas
  • Adrenal glands
  • Kidneys, ureter, and bladder
  • Aorta and inferior vena cava
  • Prostate
  • Uterus
50
Q

Gallbladder and biliary tree Phases

A

Dual phase

  • Arterial
  • Portal venous
51
Q

Ileus

A

Area of intestine that has lost normal contractile motion, resulting in obstruction

52
Q

Abdominal aorta divides into right and left common iliac arteries at level of:

A

L4

53
Q

CT Enterography, CT Enteroclysis (if applicable) Scan delay

A

45 - 50 sec

Early portal venous phase

54
Q

Common iliac artery bifurcates at level of ______ into internal and external iliac arteries

A

L5 to S1

55
Q

Glucose level before injection of FDG should be below:

A

150 mg/dL

56
Q

Simple cyst HU

A

0 - 20 HU

57
Q

Infarct core CBV

A

Less than 2.5 mL/100g

58
Q

Hyperdense cyst HU

A

25 - 90 HU

59
Q

Maxium dosage of IV contrast

A

2 mL per kg of body weight

60
Q

In CAC areas of calcium have HU above:

A

130

61
Q

Technical parameter controlling CT system’s temporal resolution

A

Gantry rotation time

62
Q

Typical delay for GI system

A

Portal venous phase

63
Q

Mesentric vasculature dual phase

A

Arterial and Portal venous phases

64
Q

Colonoscopy Window

A

1600 / -400 (similar to lung)

65
Q

Typical delay for Spine (if needed)

A

Portal venous phase

66
Q

Delay for spine to assess vertebral arteries

A

Arterial or Dual phase

CT Registry (4 decks)

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