Gastrointestinal Imaging (CTBC 17)

Question 1

CT Abdomen/Pelvis: Indications

Answer 1

Conditions with unknown causes: e.g., N/V/D
Trauma
Etc.

Question 2

CT Abdomen/Pelvis: Scan Type

Answer 2

Helical

Question 3

CT Abdomen/Pelvis: Slice Parameters

Answer 3

5mm
Matching Interval

Question 4

CT Appendicitis: (IV) Contrast
Volume
Rate
Timing

Answer 4

100 mL IV
3 mL/s
60 s delay (portal venous phase)

Question 5

CT Abdomen/Pelvis: Gantry Tilt

Answer 5

None

Question 6

CT Abdomen/Pelvis: Contrast
Volume
Rate
Timing

Answer 6

100 mL
3 mL/s
60s scan delay (portal venous)

Question 7

CT Abdomen/Pelvis:
Optional contrast for non-trauma
Timing
Volume
Content (3)

Answer 7

Oral 1h prior
600 mL
Water
Diluted barium
Diluted Iodine

Question 8

CT Abdomen/Pelvis: Algorithm

Answer 8

Standard 400/40

Question 9

CT Abdomen/Pelvis: Utility of Delays

Answer 9

Kidneys/Bladder for trauma patients

Question 10

CT Abdomen/Pelvis: Traumatic Injuries of the _______, _______, & _______ are visible

Answer 10

Liver
Spleen
Kidneys

Question 11

CT Abdomen/Pelvis: Laceration (fracture) appears as

Answer 11

Abnormal contrast perfusion, sometimes surrounded by hematoma formation

Question 12

Most bowel conditions are visible during the _______ phase of contrast

Answer 12

portal venous

Question 13

CT Abdomen/Pelvis: Mechanical blockage of bowel (e.g., from tumor) may lead to

Answer 13

bowel distention (from fluid/gas)

Question 14

CT Abdomen/Pelvis: Malignant Obstruction

Answer 14

Bowel blockage due to malignant process (e.g., cancerous tumor)

Question 15

CT Appendicitis: Substantially Identical to Abd/Pelv except (2)

Answer 15

Thinner slices
Use of Rectal Contrast

Question 16

CT Appendicitis: Rectal Contrast used d/t

Answer 16

Focus is on large bowel appendage

Question 17

CT Appendicitis: Indications (2)

Answer 17

RLQ Pn
Elev WBC

Question 18

CT Appendicitis: Scan Type

Answer 18

Helical

Question 19

CT Appendicitis: Slice Parameters

Answer 19

3.75 mm
Matching Interval

Question 20

CT Appendicitis: Gantry Tilt

Answer 20

None

Question 21

CT Appendicitis: Optional Contrast (2)

Answer 21

600 mL oral 40-60 min prior
1000 mL (immed prior) water/diluted barium/diluted iodine rectally

Question 22

CT Appendicitis: Algorithm

Answer 22

Standard 400/40

Question 23

CT Appendicitis: Appendix may be _______/_______ to cecum and oriented in _______ direction

Answer 23

Ant or Post
Any

Question 24

Appendicolith

Answer 24

Stone within appendix

Question 25

CT Appendicitis: Small spots of free air near appendix are indicative of

Answer 25

rupture/perforation

Question 26

CT Appendicitis: Non-Con

Answer 26

Commonly used throughout US/abroad: enlargement is one indicator

Question 27

CT Appendicitis: Optional Contrast (Oral)
Volume
Timing

Answer 27

600 mL
40-60 min prior

Question 28

CT Appendicitis: Optional Contrast–Rectal
Volume
Timing
Content

Answer 28

1000 mL
Immediately prior
water
diluted barium
diluted iodine

Question 29

CT Abdomen/Pelvis: FOV

Answer 29

Above diaphragm to below pubic symphysis

Question 30

CT Abdomen/Pelvis: Timing of Portal Venous phase

Answer 30

60sec

Question 31

Subcutaneous Air (under the skin) can result from

Answer 31

Broken ribs affecting the lungs

Question 32

Spleen fracture can result in

Answer 32

Hematoma surrounding laceration
Hematoma near right kidney d/t blood flowing into retroperitoneal space

Question 33

CT Abdomen/Pelvis: Slice Parameters

Answer 33

5mm
Matching Interval

Question 34

CT Abdomen/Pelvis: Reformation

Answer 34

Coronal

Question 35

CT Appendicitis: Location of appendix

Answer 35

Anywhere in abdomen or pelvis (therefore FOV is above diaphragm to below pubic symphysis)

Question 36

CT Appendicitis: Appearance of positive

Answer 36

stranding (inflammatory effect of inflamed appendix)