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collimation |
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Other problems have included improper collimation, no purging and incorrect zero diopter settings and infinity focus. We performed thoracic high-resolution computed axial tomography (HRCT), using 7 mm helical technique after intravenous contrast administration followed by high-resolution imaging, using 1 mm collimation every 1 cm from lung apex to base (Figure 1B-D). Similarly, a second set of collimation apertures constrains the transverse electron momentum. |
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