Contrast Studies

Question 1

What is positive-contrast media?

Answer 1

media contain elements with high atomic number which absorb more x rays making a white area on radiographs

Question 2

What positive-contrast medias are used?

Answer 2

barium sulfate and water soluble organic iodides

Question 3

What are the advantages of water soluble iodides?

Answer 3

can be used if perforation is suspected, transit through GI is rapid

Question 4

When should water soluble iodides be used?

Answer 4

should never be used in place of barium and only if peroration suspected

Question 5

What are some disadvantages of barium sulfate?

Answer 5

can take 3+ hours to travel from the stomach to the colon, cant be used if perforation suspected, potential aspiration pneumonia

Question 6

What is BIPS?

Answer 6

barium impregnated polyethylene beads

Question 7

What negative-contrast medias are used?

Answer 7

air, oxygen, carbon dioxide

Question 8

What is a double-contrast procedure?

Answer 8

uses both positive and negative contrast media to image an organ