Final answer:
The correct central ray placement for a lateral coccyx image is 3 to 4 inches posterior and 2 inches inferior to the ASIS.
Step-by-step explanation:
When positioning for a lateral coccyx image, the correct placement of the central ray is 3 to 4 inches posterior and 2 inches inferior to the ASIS. This ensures accurate visualization of the coccyx.
In anatomical terminology, inferior describes a position below or lower than another part of the body, and in this context, it refers to the coccyx which is near the tailbone. Lateral refers to the side of the body, and when imaging the coccyx laterally, the patient is positioned so the side of the body is facing the image receptor.