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The effect of decreasing mAs on image quality and patient dose in sinus CT

¹ Departments of Diagnostic Imaging
² Clinical Physics
³ Otolaryngology, St Bartholomew's Hospital, West Smithfield, London EC1A 7BE, UK

View larger version (162K): [in a new window]   Figure 1. Coronal CT of the sinus at 50 mAs. In the left paranasal sinus the uncinate process (open arrow), infundibulum (double headed arrow) and maxillary ostium (large arrow) are clearly seen, i.e. scoring 2 for each structure. In the right paranasal sinus the infundibulum (double headed arrow) and uncinate process (open arrow) are demonstrated but not clearly visualized, i.e. scoring 1 each.

View larger version (130K): [in a new window]   Figure 2. Coronal CT of the sinuses at the four different mAs settings: (a) 200 mAs; (b) 150 mAs; (c) 100 mAs; (d) 50 mAs.

View larger version (36K): [in a new window]   Figure 3. Graph showing the relationship between the diagnostic image quality scores in the four groups at the different mAs settings. Note no statistically significant difference between any of the four groups.