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CT & MRI > CT Application 4 Abdominopelvic > Flashcards

CT Application 4 Abdominopelvic Flashcards

1
Q

where is quadrate lobe

A

between gallbladder and round ligament

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2
Q

where is caudate lobe

A

between IVC & ligamentum venosum

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3
Q

what separates left and right lobe

A

interlobar fissure

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4
Q

largest liver lobe

A

right lobe

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5
Q

smallest liver lobe

A

caudate lobe

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6
Q

since liver tissues lack typical capillary network, what do they have instead

A

blood-filled sinusoids surrounding hepatic cells

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7
Q

what happens during portavenous phase CT

A

Right + middle + left hepatic veins filled with contrast-mixed blood emptying into IVC

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8
Q

what divides liver vertically

A

hepatic veins & falciform ligament

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9
Q

what divides liver horizontally

A

hepatic portal veins

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10
Q

cirrhosis indicator

A

Jagged outline of liver

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11
Q

biliary system includes

A
  • gallbladder
  • intraheptic bile duct
  • common bile duct
  • pancreatic duct
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12
Q

hemangioma

A

benign vascular tumor

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13
Q

3 constrictions of KUB

A
  1. ureteropelvic junction
  2. pelvic inlet
  3. bladder entrance
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14
Q

In CT Abdominal imaging, what does ‘contrast enhancement’ refer to?

A

Improve visualization of structures of similar density

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15
Q

fasting duration for oral contrast

A

2 - 6 hrs

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15
Q

CT triphasic liver process

A

non-contrast > arterial > portavenous > delayed

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16
Q

when does arterial phase occur

A

20 - 40s

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17
Q

when does portavenous phase occur

A

80 - 90s

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18
Q

slice thickness & interval for CT abdomen pelvis

A

3 - 5 mm

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19
Q

recon window for CT abdomen pelvis

A

mediastinum & lung base

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20
Q

scan region for CT abdomen pelvis

A

lung bases > past rectum / upper thigh (male)

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21
Q

non-contrast CT abdomen pelvis indication

A

renal / colic stone

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22
Q

early arterial phase timing

A

20 - 30s post IV injection / bolus tracking

23
Q

importance of early arterial phase

A
  • studying arterial vessels
  • aortic dissection
  • arterial bleeding
24
Q

late arterial phase timing

A

30 - 40s post IV injection / 20s after bolus

25
Q

late arterial phase enhances view of ___

A
  • hypervascular lesion
  • stomach + bowel
  • pancreas parenchyma
  • spleen
  • kidney cortex
26
Q

portavenous phase timing

A

80 - 90s post IV injection / 50 - 60s after bolus tracking

27
Q

portavenous phase detects ___

A
  • hypovascular liver lesion
  • cysts
  • abscess
  • metastasis
  • hepatic parenchyma
28
Q

delayed phase timing

A

4 - 7 mins post injection

29
Q

delayed phase enhances viewing of ___

A
  • fibrotic lesion
  • KUB collection
  • liver metastasis
  • TCC
30
Q

TCC

A

transitional cell carcinoma

31
Q

In liver triphasic contrast, which phase will determine whether the lesion in the liver is benign or malignant?

A

delayed phase

32
Q

Which of the following is NOT a common indication for CT MSK imaging?
A) spinal cord injury
B) joint dislocation
C) muscle strain
D) bone tumors

A

C) muscle strain

33
Q

What is the typical slice thickness used for CT imaging of the small extremities?

A

0.5mm

34
Q

MAR

A

metal artifact reduction

35
Q

DSI

A

dual source imaging

36
Q

what does DSI allow for

A

use of high keV monochromatic images to reduce beam hardening effects

37
Q

Which of the following is/are benefit(s) of using CT for musculoskeletal imaging? Select all that apply.
A) high spatial res
B) image complex #
C) superior soft tissue contrast
D) faster scan times than MRI

A

A, B, D

38
Q

where does liver receive blood from

A

hepatic portal vein mainly and hepatic artery

39
Q

cirrhosis features

A

jagged edge liver (surface nodularity), hypertrophy, parenchymal heterogeneity, ascites

40
Q

cysts/lesion features

A

hypodense bubblesf

41
Q

fatty liver features

A

hypodense liver

42
Q

gallbladder stone features

A

diamonds in gallbladder

43
Q

dilatation features

A

“black vessels” seen

44
Q

hemangioma features

A

“sun” shape seen

45
Q

HU of simple cyst

A

<20HU

46
Q

complex cyst HU

A

80HU

47
Q

what indicates 1st part of duodenum

A

duodenal bulb

48
Q

how to differentiate between jejunum & ileum

A

ileum hyperdenser than jejunum and closer to right side

49
Q

what oral contrast used to distend GI tract and show intestinal lumen

A

diluted iodinated CM, barium sulphate, water

50
Q

CT contrast phases of kidneys

A

corticomedullary = 30-40s

nephrogram = 80 - 120s

excretory 3 mins

51
Q

small obstructions occur due to ___

A

adhesions, hernias, masses

52
Q

inflammatory bowel disease sign

A

target sign made of serosa, submucosa, mucosa

53
Q

volvulus sign

A

bird beaks at large bowels

54
Q

how does HCC liver appear

A

arterial phase = hyperdense

portavenous = isodense

delay = hypodense

55
Q

slice thickness of CT hip/pelvis

A

2-5mm

CT & MRI (12 decks)

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