Gastrointestinal Imaging (CTBC 17)--Liver/Pancreas

Question 1

CT Liver: Purpose

Answer 1

Evaluate liver for cancer/tumor

Question 2

CT Liver: Purpose of multiphase

Answer 2

Differentiate b/w primary, metastatic, & benign tumors

Question 3

CT Liver: Benign Tumor

Answer 3

Hemangioma

Question 4

CT Liver: Indications

Answer 4

Known or suspected liver CA

Question 5

CT Liver: Scan Type

Answer 5

Helical

Question 6

CT Liver: Slice Parameters

Answer 6

2.5 mm w matching interval

Question 7

CT Liver: Gantry Tilt

Answer 7

None

Question 8

CT Liver: Oral Contrast

Answer 8

600 mL 40-60 min prior

Question 9

CT Liver: (IV) Contrast
Volume
Rate
Timing

Answer 9

100mL
3mL/s

1) Non-Con
2) Arterial: 30s scan delay
3) Portal Venous: 60s scan delay
4) Delayed: 5+ min

Question 10

CT Liver: Algorithm

Answer 10

Standard 400/40

Question 11

CT Liver: Value of Non-Con (Phase 1)

Answer 11

Establish baseline

Question 12

CT Liver: Arterial Phase
Timing
Value

Answer 12

(@30 s)
HCC typically have arterial blood supply

Question 13

CT Liver: Portal Venous Phase
Timing
Benefit

Answer 13

(@60s)
Metastatic liver cancer often supplied by portal venous blood

Question 14

CT Liver: Delayed Phase (4th)
Timing
Benefit

Answer 14

(@5+ min)
Hemangiomas fill w/contrast only after several minutes

Question 15

CT Pancreas: Benefit of oral contrast immediately prior to scan

Answer 15

Differentiate duodenum from pancreatic head

Question 16

CT Pancreas: Utility of Delayed Phase

Answer 16

None

Question 17

CT Pancreas: Indications

Answer 17

Known or suspected pancreatic mass

Question 18

CT Pancreas: Scan Type

Answer 18

Helical

Question 19

CT Pancreas: Slice parameters

Answer 19

2.5mm w matching interval

Question 20

CT Pancreas: Gantry Tilt

Answer 20

None

Question 21

CT Pancreas: Oral Contrast (2)

Answer 21

600 mL oral 40-60min prior
Additional immed prior to scan

Question 22

CT Pancreas: (IV) Contrast
Volume
Rate
Timing

Answer 22

100mL
3mL/s
1) Non-con
2) Arterial: 30s delay
3) Portal Venous: 60s delay

Question 23

CT Pancreas: Algorithm

Answer 23

Standard 400/40

Question 24

CT Pancreas: Value of (1) Non-Con

Answer 24

Minimal

Question 25

CT Pancreas: Most common (90% of all neoplasms) tumor of pancreas

Answer 25

Pancreatic Duct Adenocarcinoma

Question 26

CT Pancreas: Pancreatic Duct Adenocarcinoma Appearance

Answer 26

Hypodense (darker) mass

Question 27

A scan delay time of 35s/70s might apply to

Answer 27

CT Pancreas

Question 28

CT Pancreas: Location of Pancreas

Answer 28

Upper 1/3 abdomen
Just below stomach
Well above Iliac Crests
Head of Pancreas is centrally located
Body/tail extend posteriorly towards spleen in LUQ