[Radiation exposure during spiral-CT of the paranasal sinuses].

Purpose: Determination of the radiation doses in spiral CT of the paranasal sinuses using a variety of mAs values and scan protocols.

Material And Methods: CT examinations of the paranasal sinuses were performed using an Alderson-Rando phantom. Radiation dose was determined by LiF-TLD at the level of high risk organs in the head and neck region for combinations of different scan parameters (2/3, 3/3, 3/4 mm) and decreasing charges (200, 150, 100, 50, 25 mAs) on a spiral CT.