Panoramic Magnification — NDEB AFK MCQ
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Correct answer: B — 20-30%
Panoramic radiographs magnify the image by approximately 20-30% (average ~25%) due to the geometric relationship between the X-ray source, the object (patient), and the image receptor (detector). The magnification is not uniform — objects closer to the receptor are less magnified, and objects farther from the receptor (closer to the X-ray source) are more magnified. This non-uniform magnification means panoramic radiographs cannot be used for precise linear measurements without correction factors. CBCT provides more accurate measurements.
Reference: White & Pharoah – Oral Radiology: Principles and Interpretation, 8th ed., 2019