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Figure 9


FIGURE 9.  Geometric dose efficiency. (A) If MSCT detectors configured to acquire four 2.5-mm slices are irradiated with 10-mm-wide x-ray beam, as specified for SSCT, outer 2 slices will receive lower intensity and yield higher image noise. (B) To compensate, MSCT beams are widened to use only inner, nonpenumbra regions. Penumbra regions that were partially used in SSCT are discarded in MSCT, leading to reduced dose efficiency.





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