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Paranasal sinuses are filled with air Their function is to-humidify and warm the inspired air,provide resonance to voice,lighten the skull bones, andact as thermal insulatorsâ¦ to protect orbit and cranium from variation in temperature of air in our nose Paranasal sinuses are air containing cavities (hollow spaces) in certain bones of skull.
A study by Aksoy et al indicated that high-pitch, ultra-low-dose CT scanning can effectively image the paranasal sinuses. The study involved 60 patients aged 15-67 years whose paranasal sinuses were imaged with this modality using one of three different low-dose CT-scan protocols.