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Average image noise values (±1 SD) over ten slices in different phantom regions using pulmonary embolism protocols with ATVS. The upper and lower images show the corresponding values for GE and Siemens systems, respectively. Noise values are calculated for six regions-of-interest (ROI 1 is spine, ROIs 2–6 are in soft tissue, see Fig. 2) using three scout directions (AP, LAT, PA) and at five vertical table positions (phantom center -6 to +6 cm from the CT scanner isocenter).
