In PA chest:
- A- center at T4
- B- Back of the hands are placed over the head
- C- Shoulders are depressed
- D- Exposure is made at full inspiration
- E- All are tru.
The correct answer is C. Shoulders are depressed.
Here's why:
A. Center at T4:
This is generally true for PA chest X-rays. The central ray should be directed at the level of the 4th thoracic vertebra to ensure proper visualization of the mediastinum and lung fields.
B. Back of the hands are placed over the head:
This is not necessary for standard PA chest X-rays. Hands are usually placed by the side of the body or slightly behind the back to avoid obscuring the lung fields.
D. Exposure is made at full inspiration:
This is true. Taking the X-ray at full inspiration maximizes lung expansion and provides a clearer view of the structures within the chest.
E. All are true:
Only C. Shoulders are depressed is not a true statement for PA chest X-rays. In fact, the opposite is desired. Shoulders should be rolled forward and downward during a PA chest X-ray. This helps to move the scapulae (shoulder blades) away from the lung fields, preventing them from obscuring important structures.
