In an AP projection, which statement about the patient's orientation is correct?

In an AP projection, which statement about the patient's orientation is correct?

• A. The patient is positioned facing away from the X-ray tube.
• B. The patient is positioned facing the X-ray tube.
• C. The patient's orientation is not important for AP projection.
• D. The X-ray tube rotates around the patient.

Answer: (B)

AP stands for anterior-posterior, so the X-ray beam travels from the front of the body to the back. The anterior surface faces the X-ray tube, and the image receptor sits behind the patient. That’s why the correct statement is that the patient is facing the X-ray tube. If the patient faced away from the tube, the beam would enter from the back, which corresponds to a PA projection. Orientation matters because it affects which side is closer to the detector and can change the apparent size of structures (for example, the heart often appears more magnified on AP images). The idea that the tube rotates around the patient isn’t part of a standard AP setup.

AP stands for anterior-posterior, so the X-ray beam travels from the front of the body to the back. The anterior surface faces the X-ray tube, and the image receptor sits behind the patient. That’s why the correct statement is that the patient is facing the X-ray tube. If the patient faced away from the tube, the beam would enter from the back, which corresponds to a PA projection. Orientation matters because it affects which side is closer to the detector and can change the apparent size of structures (for example, the heart often appears more magnified on AP images). The idea that the tube rotates around the patient isn’t part of a standard AP setup.