How does object distance affect image sharpness in panoramic imaging?

• A. Objects close to the receptor appear blurred; objects far from the receptor are sharp.
• B. Objects close to the receptor appear sharp; objects far from the receptor are blurred and magnified.
• C. Distance has no effect on sharpness.
• D. Only objects at the edge of the focal trough are sharp.

Answer: (B)

In panoramic imaging, image sharpness is governed by where the anatomy sits along the depth axis relative to the receptor. Structures that lie close to the receptor fall within the depth region that is sharply projected, so they appear crisp. As anatomy moves farther away from the receptor, the projection becomes less precise, causing blur, and the image of those structures grows larger on the film or sensor (magnification) due to the geometry of the rays. That combination—less sharpness and greater magnification—explains why objects near the receptor look sharp while those farther away look blurred and magnified.