Dosimetry in CBCT with Different Protocols: Emphasis on Small FOVs Including Exams for TMJ

Nascimento, Helena Aguiar Ribeiro do; Andrade, Marcos Ely Almeida; Frazão, Marco; Nascimento, Eduarda Helena Leandro; Ramos‐Perez, Flávia Maria de Moraes; Freitas, Deborah Queiroz

doi:10.1590/0103-6440201701525

Cited by 22 publications

(22 citation statements)

References 18 publications

(27 reference statements)

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“…Descriptive statistics and statistical comparisons of MSV, MSS, linear maximum width (LMW), height (LMH) and depth (LMD) measurements of the maxillary sinus between right and left side and sex in each group are shown in Table 1. MSV results showed statistically significant difference when comparing the males and females in group 1 (age 6-8) and group 3 (age [12][13][14]. No statistically significant difference has been noticed between right and left side of the same groups (Table 1).…”

Section: Resultsmentioning

confidence: 80%

“…Our study conducted on CBCT of young patients yielded different results compared with Graney and Oktay. In fact, statistically significant difference was evaluated for MSV between male and female in the groups 1 (age 6-8) and 3 (age [12][13][14]. Maxillary sinus surface, maximum width (LMW) and maximum depth (LMD) highlighted a statistically significant difference between sexes only in the group 3.…”

Section: Discussionmentioning

confidence: 96%

“…Cone Beam Computed Tomography (CBCT) was introduced in 1998 and it has become more and more frequently used for clinical and research purposes in dentistry [12]. It represented a real revolution as it could provide accurate and distortion free images of the craniofacial bones and a lower absorbed radiation dose compared with multi slice computed tomography (MSCT) [13][14][15].…”

Section: Introductionmentioning

confidence: 99%

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Three-Dimensional Evaluation of Maxillary Sinus Changes in Growing Subjects: A Retrospective Cross-Sectional Study

et al. 2020

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This study aims to evaluate changes of maxillary sinuses in growing subjects. Cone Beam Computed Tomography (CBCT) scans of 146 patients were divided according to gender and age (6–8, 9–11, 12–14 years old). Left, right and total maxillary sinus volume (MSV-R, MSV-L, MSV-Tot) and surface (MSS-R, MSS-L, MSS-Tot), left and right linear maximum width (LMW-L, LMW-R), depth (LMD-R, LMD-L) and height (LMH-R, LMH-R) were calculated using Mimics Research 22. Kruskal–Wallis Test and showed a statistically significant increase in both genders for all variables. Pairwise comparisons in females are always statistically significant in: LMH-R, LMH-R, MSS-Tot, MSV-Tot. All other variables showed a statistical significant increase between 9–11 and 12–14, and between 6–8 and 12–14 age groups, apart from LMSW-R, LMSW-L, LMSD-R, LMSD-L between 6–8 and 12–14 age groups. Pairwise comparisons in males are always and only statistically significant between 9–11 and 12–14, and between 6–8 and 12–14 groups. Symmetrical measurements (right and left) evaluated using Wilcoxon test retrieved no statistical significant difference. Comparisons between measurements on male and female subjects using Mann–Whitney test showed a statistical significant difference in 6–8 years group in MSV-R, MSV-L and MSV-Tot, and in 12–14 age group in MSV-R, MSV-L, MSV-Tot, MSS-r, MSS-l, MSS-Tot, MSW-R, MSW-L, MSD-R, MSD-L. Intraclass Correlation Coefficient (ICC) assessing inter-operator and intra-operator concordance retrieved excellent results for all variables. It appears that maxillary sinus growth resembles the differential peak of growth in male and female subjects. Sinuses starts to develop early in female subjects. However, in the first and last age group female sinuses are statistically significantly smaller compared to male ones. In male subjects, sinus growth occurs mainly between the second and third age group whilst in female subjects it starts between the first and second age group and continues between the second and the last. Sinus has a vertical development during the peak of growth, which is the main reason for its increase in volume.

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Section: Resultsmentioning

confidence: 80%

Section: Discussionmentioning

confidence: 96%

Section: Introductionmentioning

confidence: 99%

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Three-Dimensional Evaluation of Maxillary Sinus Changes in Growing Subjects: A Retrospective Cross-Sectional Study

et al. 2020

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“…However, novel clinical or diagnostic techniques or instruments need to be validated in advance of their routinely use in daily dental practice (Brägger, 2005; Walter et al., 2011). Various studies already evaluated the acceptable image quality of a reduction of rotation from 360° to 180° during CBCT acquisition (Lennon et al., 2011; Nascimento et al., 2017; Neves, Vasconcelos, Campos, Haiter‐Neto, & Freitas, 2014). In addition, evidence‐based continuing education courses are necessary to facilitate the transfer of knowledge from researchers to the dental community.…”

Section: Discussionmentioning

confidence: 99%

Impact of CBCT image quality on the confidence of furcation measurements

Rinne

Dagassan-Berndt

Connert

et al. 2020

J Clinic Periodontology

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Background To investigate the impact of scanning parameter in cone‐beam computed tomography (CBCT) images on accuracy and confidence with measurements of furcation involvement (FI) in maxillary molars. Material and methods Six half cadaver heads with present maxillary molars (n = 10) were available. CBCT scans with the fixed‐parameter field of view (4 × 4 cm, 12 × 17 cm) amperage and voltage (4 mA, 90 kV) and with varying scan modes (SM), that is images/scan (IS), voxel sizes (VZ) and rotation (R), were performed using one CBCT apparatus. The images were analysed by two calibrated investigators. Horizontal FI's were measured in mm or a “through and through” destruction (FI degree III) was recorded. Each rater scored the FI measurements performed in each scan as “confident” or as “not confident”. Data were statistically analysed using chi‐square tests. Results The agreement between CBCT FI measurements and intra‐surgical FI measurements varied according to SM (SM HiSp 180°, 0.08: kappa 0.538, CI; 95%: 0.362–0.714; SM Std. 360°, 0.25: kappa 0.698, CI; 95%: 0.534–0.861). The number of measurements scored as “confident” varied according to SM (SM Std. 360°, 0.08:52 out of 60 measurements; SM Std. 360°, 0.25:16 out of 60 measurements; p < .001). Conclusions SM of CBCT significantly affect the confidence with FI measurements in maxillary molars.

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“…Some cone-beam scanners are equipped with a small field of view (FOV), allowing examination of specific areas of interest and, especially in endodontics, high resolution images are obtained with small FOV equipments. This is important because it restricts the area of exposure, possibly reducing the radiation dose to the patient 5,6 . Certain factors however, such as voxel size, acquisition parameters, and number of acquired images, can directly influence the quality of the produced tomographic images 7 .…”

Section: Introductionmentioning

confidence: 99%

Root canal segmentation in cone-beam computed tomography

et al. 2019

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Aim: The purpose of this study was to compare root canal volumes (RCVs) obtained by means of cone beam computed tomography (CBCT) to those obtained by micro-computed tomography (micro-CT) after applying different segmentation algorithms. Methods: Eighteen extracted human teeth with sound root canals were individually scanned in CBCT and micro-CT using specific acquisition parameters. Two different images segmentation strategies were applied to both acquisition methods (a visual and an automatic threshold). From each segmented tooth, the root canal volume was obtained. A paired t-test was used to identify differences between mean values resulted from the experimental groups and the gold standard. In addition, Pearson correlation coefficients and the agreement among the experimental groups with the gold standard were also calculated. The significance level adopted was 5%. Results: No statistical differences between the segmentation methods (visual and automatic) were observed for micro-CT acquired images. However, significant differences for the two segmentation methods tested were seen when CBCT acquired images were compared with the micro-CT automatic segmentation methods used. In general, an overestimation of the values in the visual method were observed while an underestimation was observed with the automatic segmentation algorithm. Conclusion: Cone beam computed tomography images acquired with parameters used in the present study resulted in low agreement with root canal volumes obtained with a micro-CT tomography gold standard method of RCV calculation.

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Dosimetry in CBCT with Different Protocols: Emphasis on Small FOVs Including Exams for TMJ

Cited by 22 publications

References 18 publications

Three-Dimensional Evaluation of Maxillary Sinus Changes in Growing Subjects: A Retrospective Cross-Sectional Study

Three-Dimensional Evaluation of Maxillary Sinus Changes in Growing Subjects: A Retrospective Cross-Sectional Study

Impact of CBCT image quality on the confidence of furcation measurements

Root canal segmentation in cone-beam computed tomography

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