Ultra-low-dose lung multidetector computed tomography in children - Approaching 0.2 millisievert.

Purpose: To compare objective and subjective parameters in image quality and radiation dose of two MDCTs (helical 64 detector CT vs. axial 256 detector CT) in paediatric lung CT.

Methods: Radiation dose and image quality were compared between non-enhanced lung CT from a helical 64-slice multidetector CT (MDCT 1) and a 256-slice scanner (MDCT 2) with axial wide-cone acquisition and using deep learning image reconstruction.

Analysis of pneumatization and neurovascular structures of the sphenoid sinus using cone-beam tomography (CBT).

Background: The sphenoid sinus is a frequent target of paranasal sinus surgery. Because of the high risk of injuring the surrounding structures (e.g.