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 Radiation ANalog DOsimetry system (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) field of view (FOV) for submandibular
imaging and an 8 cm (diameter) by 8 cm (height) 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 as the optimal exposure
parameters, 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 settings 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 3-dimensional sialography with high image quality and minimal effective dose
can be delivered using CBCT with localized, small FOVs.
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Article info
Publication history
Published online: December 30, 2022
Accepted:
December 23,
2022
Received in revised form:
December 19,
2022
Received:
August 24,
2022
Identification
Copyright
© 2022 Elsevier Inc. All rights reserved.
