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Cone beam CT axial plane corresponding to the upper tibial plane. The eight dotted lines are drawn at 45° to one another and measure 15 mm from the metallic surface. Note beam hardening artefacts which manifest as hypodense streaks that gradually diminish from the metallic region towards the periphery. GL, gastrocnemius lateral muscle; GM, gastrocnemius medial muscle; PL, patellar ligament; PO, popliteus muscle.
