AP Ribs

Question 1

• What ribs are best demonstrated in an AP projection?

Answer 1

Posterior

Question 2

• Why is upright position preferred for upper rib radiographs?

Answer 2

Helps bring diaphragms to lowest point

Question 3

• Why is supine position preferred for lower rib radiographs?

Answer 3

Helps keep diaphragm as high as possible

Question 4

• Where is the top of the IR located for upper rib radiographs?

Answer 4

1.5” above shoulder

Question 5

• What is the central ray location?

Answer 5

MSP t7

Question 6

• What kVp is usually used for AP ribs and why does it vary from a chest x-ray?

Answer 6

70-80 to get more contrast of white on ribs

Question 7

• If lower ribs are required, where should the bottom of the IR be located?

Answer 7

half way between xiphoid process and lower rib reigon

Question 8

• What is the proper breathing instructions for upper ribs? Why?

Answer 8

2 full inspirations to bring diaphragms to lowest point, and see ribs 1-10

Question 9

• What is the proper breathing instructions for lower ribs? Why?

Answer 9

After expiration to get diaphragms higher and see ribs 8-12

Question 10

• Why is it better to perform rib radiographs unilaterally?

Answer 10

Increase magnification, see more detail

Question 11

• How many posterior ribs should be demonstrated above the diaphragm when upper ribs are radiographed?

Answer 11

1-10

Question 12

• If less posterior ribs are being demonstrated, what error occurred?

Answer 12

Not big enough inspiration

Question 13

• Which posterior ribs should be demonstrated when the lower ribs are radiographed?

Answer 13

8-12