Question

Which difference may be present in a semi-erect AP chest projection if the patient cannot stand for PA chest imaging?

1) Reduced number of ribs visualized due to inspiration limitations
2) The heart will appear smaller due to reduced OID
3) Less risk of chin superimposition over apices
4) Better visualization of bony thorax

Answer 1

The difference in a semi-erect AP chest projection if the patient cannot stand for PA chest imaging is the reduced number of ribs visualized due to inspiration limitations.

Step-by-step explanation:

In a semi-erect AP chest projection, if the patient cannot stand for PA chest imaging, the difference that may be present is the reduced number of ribs visualized due to inspiration limitations. The PA chest imaging allows for better visualization of the bony thorax as it includes more ribs, whereas the semi-erect AP projection may limit the number of ribs visible due to the patient's posture and limited inspiration. Other differences mentioned in the options are not applicable in this scenario.