a shows a setup with the x-ray tube on the bottom. The red arrows represent radiation beams that scatter after they deflect off of the object being imaged. With the x-ray tube on the bottom most of the scattered (deflected) radiation is towards the legs and feet of the surgeon. b shows a setup with the x-ray tube on the top. Here the scattered radiation is towards the head and neck region of the surgeon
Kaplan, D.J., Patel, J.N., Liporace, F.A. et al.
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Kaplan, D.J., Patel, J.N., Liporace, F.A. et al. Intraoperative radiation safety in orthopaedics: a review of the ALARA (As low as reasonably achievable) principle. Patient Saf Surg 10, 27 (2016). <a rel="nofollow" class="external free" href="https://doi.org/10.1186/s13037-016-0115-8">https://doi.org/10.1186/s13037-016-0115-8</a>