EuroSafe Imaging 2020
Performed at one institution, Diagnostic or prognostic study, Retrospective, Infection, Diagnostic procedure, CT, Radioprotection / Radiation dose, Head and neck, Head and Neck
B. Petritsch, A. Weng, T. A. Bley, A. Kosmala
Computed tomography (CT) of the paranasal sinus and facial skull represents the gold standard for diagnosis of the extent and severity of inflammatory sinus disease. Radiation exposure in this examination is a major concern, as radiosensitive organs as the optic lenses are included in the scan volume, and are exposed to direct or scattered radiatio. For this reason various dose-reduction strategies have been discussed before. Amongst other things a recently introduced tin (Sn) filter absorbs less relevant low-energy photons and shifts the x-ray spectrum towards higher energies, which is known as "spectral shaping". This potentially helps to reduce radiation exposure to the patient. This hardware based dose-saving method can be combined with other, more established dose saving methods like iterative reconstructions (IR) and the use of comperatively low tube voltages.
Thus, the aim of this investigation was to compare radiation dose and image quality of a newly designed tin-filtered ultra-low-dose protocol using IR at an 3rd generation dual-source CT (DSCT) against conventional 64 / 16-row CT with IR / filtered back projection (FBP), respectively.