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(a) Diagram of the SBDX system to scale. An electron beam is magnetically deflected to raster across a transmission, thin film anode. The collimator has 100 × 100 holes. The distances shown are source-detector-distance (SDD), tumor-detector-distance (TDD), tumor depth in patient (12.5 cm), patient thickness (25 cm), and tumor thickness (5 mm). (b) To achieve a greater maximum tomographic angle on the system a new collimator can be designed for a smaller SDD.
