Evaluation of different low-dose multidetector CT and cone beam CT protocols in maxillary sinus imaging: Part I- An in vitro study.

Evaluation of different low-dose multidetector CT and cone beam CT protocols in maxillary sinus imaging: Part I- An in vitro study.

Dentomaxillofac Radiol. 2017 Mar 07;:20160323

Authors: Almashraqi AA, Ahmed EA, Mohamed NS, Barngkgei IH, Elsherbini NA, Halboub ES

Abstract
OBJECTIVES: This in-vitro study aimed at assessing radiation dose and image quality of different low-dose MDCT and CBCT imaging protocols in comparison to standard MDCT protocol for maxillary sinus imaging.
METHODS: Effective dose (E) and image quality of 10 MDCT (changing effective milliampere (EmAs) starting from 141.3 to 20) and 3 CBCT protocols (changing mAs and voxel size (VS)) were assessed throughout scanning an anthropomorphic head and neck Alderson Rando phantom. Effective doses were calculated using thermoluminescent dosimeters (TLDs) fixed at six sensitive organs (14 sites) on the Rando phantom. Image quality was assessed objectively (by calculating the standard deviation values of the radiographic density of water) and subjectively (by assessing the diagnostic image quality using a four-graded scale: 1 = very good, 2 = good, 3 = acceptable, 4 = unacceptable).
RESULTS: Two MDCT protocols (120 KV/32 effective-mA and 120 KV/25 effective-mA) had lower radiation doses with statistically significant differences (P < 0.001) compared to that of standard MDCT protocol (120 KV/141.3 effective-mA) and they preserved a good diagnostic image quality. One CBCT protocol (120 KV/20mAs) had a reasonable radiation dose and good image quality. There were no statistically significant differences between the above-mentioned lower-dose MDCT and CBCT protocols (P > 0.05) in respect of the radiation dose and image quality.
CONCLUSIONS: The low-dose MDCT and CBCT protocols are viable method for maxillary sinus examination as evaluated using the above-mentioned phantom that yield a good diagnostic image quality using an effective dose approximately seven and eleven times lower than that of the standard MDCT; respectively. These findings were evaluated in the in vivo part of this project.

PMID: 28266870 [PubMed - as supplied by publisher]

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