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Optimizing effective dose and image quality in cone beam CT sialography

Published:December 30, 2022DOI:https://doi.org/10.1016/j.oooo.2022.12.012

      Abstract

      Objectives

      : The purpose of this study was to develop protocols that optimize patient radiation dose and image quality for cone beam computed tomographic (CBCT) sialography for the major salivary glands.

      Study Design

      : Radiation absorbed dose measurements were repeated in triplicate using 25 sites in the head and neck of a RANDO® phantom, and effective doses were calculated across a range of peak kilovoltage (kVp) and milliamperage (mA) settings using an 8 cm (diameter) by 5 cm (height) FOV for submandibular imaging and an 8 cm (diameter) by 8 cm (height) field-of-view (FOV) for parotid imaging. Image signal difference-to-noise ratio (SDNR) was determined, and the figure-of-merit (FOM), a measure of image quality, was calculated.

      Results

      : For submandibular sialography, 85 kVp and 6 mA were chosen, resulting in a mean effective dose of 82.47 µSv and a mean SDNR of 13.86, with a mean FOM of 2.33 µSv−1. For parotid sialography, 70 kVp and 6 mA were chosen, and these resulted in a mean effective dose of 39.99 µSv, a mean SDNR of 17.43, and a mean FOM of 7.60 µSv−1.

      Conclusions

      : Low-dose 3D sialography with high image quality and minimal effective dose can be delivered using CBCT with localized, small FOVs.
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