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Assessment of image quality and exposure parameters of an intraoral portable X-rays device.

ABSTRACT: OBJECTIVE::To evaluate the exposure parameters, radiation protection, absorbed dose and radiographic image quality of the DIOX® intraoral portable radiography device. METHODS::The exposure parameters were measured using the Xi UNFORS detector. Operator exposure to secondary radiation was measured using the 1800cc ionization chamber coupled to the electrometer. The absorbed dose (D) in the patient was calculated using TLD-100H positioned in the Alderson RANDO anthropomorphic simulator. The quality of the radiographic digital image was assessed by comparing radiographic images obtained from two conventional devices (CS 2200®, Carestream Health; Heliodent plus®, Sirona Dental Systems GMbH) with the radiological simulator of the upper molar region RMI (Radiation Measurements Instruments), using three acquisition sensors: Kodak RVG 5000® and Kodak PSP®, Eastman Kodak Company, Rochester, NY; EVO Micro Image®, Brazil. RESULTS::The DIOX intraoral portable radiographic device demonstrated reliability in relation to the performance of the standard evaluated parameters, except for the diameter of the radiation field (5.8 ?mm) less or greater. No evidence of device head radiation was detected. The Pb lead protection of the apparatus attenuates the secondary radiation, thus protecting the operator. However, it was observed that the region of the operator's gonads was the most exposed during the measurements. In the Alderson RANDO anthropomorphic simulator, the highest value of D was in the region corresponding to the submandibular and lingual glands of the left side (0.568 mGy). The image quality of the DIOX portable radiographic apparatus presented quality standards equivalent to those produced by the two conventional radiographic devices. CONCLUSION::The DIOX intraoral portable radiography device demonstrated reliability in relation to the quality control and radioprotection criteria, according to international standards. Results obtained demonstrated the safe use of the DIOX intraoral portable radiography device and indicated the need for debate and change in international sanitary oversight standards regarding the use of portable XR devices in dentistry.

SUBMITTER: Zenobio EG

PROVIDER: S-EPMC6476356 | biostudies-literature | 2019 Mar

REPOSITORIES: biostudies-literature

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Assessment of image quality and exposure parameters of an intraoral portable X-rays device.

Zenóbio Elton G EG Zenóbio Madelon Af MA Azevedo Carolina Db CD Nogueira Maria do Socorro MDS Almeida Cláudio D CD Manzi Flávio R FR

Dento maxillo facial radiology 20181203 3

<h4>Objective:</h4>To evaluate the exposure parameters, radiation protection, absorbed dose and radiographic image quality of the DIOX<sup>®</sup> intraoral portable radiography device.<h4>Methods:</h4>The exposure parameters were measured using the Xi UNFORS detector. Operator exposure to secondary radiation was measured using the 1800cc ionization chamber coupled to the electrometer. The absorbed dose (D) in the patient was calculated using TLD-100H positioned in the Alderson RANDO anthropomor ...[more]

PMID: 30426762

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Project description:Data quality is increasingly recognized as one of the most important confounding factors in brain imaging research. It is particularly important for studies of brain development, where age is systematically related to in-scanner motion and data quality. Prior work has demonstrated that in-scanner head motion biases estimates of structural neuroimaging measures. However, objective measures of data quality are not available for most structural brain images. Here we sought to identify quantitative measures of data quality for T1-weighted volumes, describe how these measures relate to cortical thickness, and delineate how this in turn may bias inference regarding associations with age in youth. Three highly-trained raters provided manual ratings of 1840 raw T1-weighted volumes. These images included a training set of 1065 images from Philadelphia Neurodevelopmental Cohort (PNC), a test set of 533 images from the PNC, as well as an external test set of 242 adults acquired on a different scanner. Manual ratings were compared to automated quality measures provided by the Preprocessed Connectomes Project's Quality Assurance Protocol (QAP), as well as FreeSurfer's Euler number, which summarizes the topological complexity of the reconstructed cortical surface. Results revealed that the Euler number was consistently correlated with manual ratings across samples. Furthermore, the Euler number could be used to identify images scored "unusable" by human raters with a high degree of accuracy (AUC: 0.98-0.99), and out-performed proxy measures from functional timeseries acquired in the same scanning session. The Euler number also was significantly related to cortical thickness in a regionally heterogeneous pattern that was consistent across datasets and replicated prior results. Finally, data quality both inflated and obscured associations with age during adolescence. Taken together, these results indicate that reliable measures of data quality can be automatically derived from T1-weighted volumes, and that failing to control for data quality can systematically bias the results of studies of brain maturation.

Dataset Information

Assessment of image quality and exposure parameters of an intraoral portable X-rays device.

Publications

Assessment of image quality and exposure parameters of an intraoral portable X-rays device.

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