World Journal of Dentistry

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VOLUME 11 , ISSUE 5 ( September-October, 2020 ) > List of Articles

ORIGINAL RESEARCH

Optimization of Radiation Dose and Image Quality for Large Field of View Cone-beam Computed Tomography: An In Vitro Study

Citation Information : Optimization of Radiation Dose and Image Quality for Large Field of View Cone-beam Computed Tomography: An In Vitro Study. World J Dent 2020; 11 (5):346-354.

DOI: 10.5005/jp-journals-10015-1768

License: CC BY-NC 4.0

Published Online: 28-09-2020

Copyright Statement:  Copyright © 2020; The Author(s).


Abstract

Aim and objective: This study aims to optimize the radiation dose and the image quality of a large field of view (FOV) cone-beam computed tomography (CBCT). Materials and methods: Effective dose (E) and image quality delivered by six protocols that varied according to voxel size (VS) (0.25, 0.3, and 0.4) and exposure time (ET) (7, 4, and 2 seconds) were compared by scanning a large FOV (16 × 13 cm) of a RANDO phantom using CBCT and each protocol was scanned twice. Thermoluminescent dosimeters placed on the phantom head were used to calculate E. Image noise and subjective image assessment were utilized to quantitatively and qualitatively assess the image quality, respectively. Repeated-measures analysis of variance (ANOVA) was used for comparisons with a significant level set at ≤0.05. Results: All protocols generated significantly different E values compared with each other (p values ranged between <0.0001 and <0.05) except for protocols V and VI (p > 0.05). Regarding image quality, both image noise and subjective assessment revealed that protocol V had acceptable image quality when compared with the standard protocol. Conclusion: The use of 0.3 VS together with the lowest ET, as recommended by the manufacturer, can minimize the radiation dose while maintaining the diagnostic image quality generated from a large-FOV CBCT. Clinical significance: Balancing between radiation dose reduction and diagnostic image quality is an important issue in diagnostic imaging that maximizes the clinical benefits and decreases the patient risks of ionizing radiation, especially for a large-FOV CBCT.


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