Imaging Procedures ABDOM/PELVIS

Question 1

What is the anatomical coverage for the CT of the abdomen

Answer 1

diaphragm–> iliac crest

Question 2

What is the anatomical coverage for the CT of the abdomen / pelvis?

Answer 2

diaphragm–> pelvic symphysis

Question 3

The peritoneal cavity includes what structures

Answer 3

stomach 
small bowel/ duodenum / jejunum/ illeum
transverse colon 
spleen
gall bladder liver
ovaries

Question 4

T/F

the peritoneal cavity opens up to the exterior in males .

Answer 4

false.

opens up in females. closed sac in males

Question 5

The peritoneum surrounds the organs with double layers or a single layer?

Answer 5

double

Question 6

Describe the mesentary

Answer 6

thickened part of peritoneum that attaches parts of intestines to abdom wall

Question 7

Describe the omentum

Answer 7

Part of mesentery that is divided into greater and lesser portions . responsible for attaching stomach and intestines

Question 8

Describe the retroperitoneum. What organs are included

Answer 8

between peritoneum and back abdominal wall

duodenum 
pancreas 
adrenal glands
kidneys/ ureters/ bladder
prostate
uterus
aorta / inferior vena cava

Question 9

How long should a person fast before an Abdom CT w/ contrast? Why?

Answer 9

2 - 6 hrs

• empties GI tract
• limits potential aspiration from irritated stomach

Question 10

A. What purpose does pre contrast administration serve in abdominal Ct ?
B. What agents are used?
C. How much ?
D. How early before exam should it be given ?

Answer 10

A. distends and illuminates abdomen

B. diluted contrast , barium sulfate, water

C. 750- 1500 mL

D. 1/2 hr - 2 hr

Question 11

Patients are usually scanned supine for an Abdominal CT. What are some other postition and why are they used ?

Answer 11

• prone & decubitus

- improves presentation of regular anatomy

Question 12

Abdom/ Pelvis
General survey studies have section widths measuring ?

Multiphasic studies have section widths measuring ?

Answer 12

3- 5 mm

1- 2 mm

Question 13

What reconstruction kernel is standard in an abdominal CT

Which kernel would you use to look at the bony details in that area

Answer 13

soft tissue

high resolution

Question 14

Fill in the following WL and WW settings

Answer 14

Soft Tissue for Abdomen
WL: 40 WW: 350

Lung Bases:
WL: -450 WW: 1400

Bone
WL: 300 WW: 2000

Question 15

4 ways IV contrast improves quality of abodom pelvic CT

Answer 15

• increasing density organ tissue
• easier to detect lesions
• Lights up vascular structures
• Asses blood flow and function of organs

Question 16

Why does the rate of contrast administration vary from 2-5 ML/ sec in an abdominal CT

Answer 16

Depends on the phase of contrast enhancement and the vein capacity