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. Author manuscript; available in PMC: 2015 Jun 7.
Published in final edited form as: Phys Med Biol. 2014 May 13;59(11):2829–2847. doi: 10.1088/0031-9155/59/11/2829

Figure 1.

Figure 1

The piecewise-linear dynamic attenuator consists of a series of wedges attached to actuators (actuators not shown). The outline of the fan beam is also shown, with the x-ray focal spot (not shown) at the apex of the fan. (a) The set of wedges. Two of the wedges have been shaded and translated. During the scan, all wedges are dynamically translated. For simplicity, only two wedges are translated here (b) A cross-section of the wedges, showing the triangular cross-sections in the plane of the fan beam. The wedge which was translated downwards introduces only a small amount of attenuation, while the wedge that was translated upwards has more attenuation. Reprinted with permission from (Hsieh and Pelc 2013).