Does the design of DXA equipment affect staff doses?
The short answer is YES. It has been shown that the scattered radiation from modern fan-beam and cone-beam systems is greater than that from older pencil-beam DXA systems. Scatter is reported in terms of predicted annual dose at 1 m from the table (for assumed workload). Newer C-arm design DXA scanners permit lateral X-ray exposures and this may also result in increased scattered radiation. Although the scattered radiation from all DXA systems is relatively small, it should not be disregarded. Fan-beam and cone-beam systems may require shielding if the operator has to be seated close to the table or if the walls are close to the table. See also the answer to Q. 1.; [Sheahan et al., 2005].
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