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Dose-effective scan protocols achieving moderate image quality. The following image quality is considered sufficient for preoperative evaluation in noncomplicated sinusitis at the lowest dose. A, Sn100 kV/150 mAs. B, Sn150 kV/25 mAs. C, 90 kV/25 mAs. The following is a low-kilovolt protocol. D, 70 kV/100 mAs has higher attenuation values of bone but is associated with a higher dose. Coronal multiplanar reformation; section thickness, 1.5 mm; window width–level, 3300/300 HU.
