The Boomerang is a compensating filter to even out the density of shoulder radiographs as well as the Thorax, nasion and chin. DESCRIPTION: A. Metal chain along the periphery indicates the presence and position of the filter on the film. It projects outside the anatomy, and reduces risks of legal litigations. B. Area of maximum absorption: equivalent to +/- 9 cm of muscle. For large shoulders, cephalometry, etc. C. Area of intermediate absorption: 45' gradient, for smaller shoulders. D. Area of minimum absorption: 30' gradient, v.g. for patella. The shadow of the shoulder from the light localizer should fall at the desired absorption level B, C or D. The filter will stay in the vertical position with a slight pressure from the rotated trunk. CEPHALOMETRY: Place maximum thickness (zone A) against nasion and chin. Use a high KV (90-1 00), a low MaS and slightly underexpose. When this portion is thinner than the rest of the thorax.
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