Effect of exposure parameters of cone beam computed tomography on metal artifact reduction around the dental implants in various bone densities

Shokri, Abbas; Jamalpour, Mohammad Reza; Khavid, Atefeh; Mohseni, Zeinab; Sadeghi, Masoud

doi:10.1186/s12880-019-0334-4

Cited by 25 publications

(26 citation statements)

References 25 publications

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“…Sixteen studies were selected for full-text reading, after which 7 studies were excluded because they dealt with topics related to artifact reduction, the evaluation of peri-implant tissue, and comparisons between the implant radiation dose of CBCT and MSCT, 11 12 13 14 15 16 17 yielding a final total of 9 selected articles. 18 19 20 21 22 23 24 25 26 …”

Section: Resultsmentioning

confidence: 99%

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Cone-beam computed tomography artifacts in the presence of dental implants and associated factors: an integrative review

et al. 2021

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Purpose This study was conducted to review the literature regarding the types of cone-beam computed tomography (CBCT) artifacts around dental implants and the factors that influence their formation. Materials and Methods A search strategy was carried out in the PubMed, Embase, and Scopus databases to identify published between 2010 and 2020, and 9 studies were selected. The implants included 306 titanium, titanium-zirconium, and zirconia implants, as well as 5 titanium cylinders. Results The artifacts around the implants were the beam-hardening artifact, the streaking artifact, and band-like radiolucent areas. Some factors that influenced the formation of artifacts were the implant material, bone type, evaluated regions, distance, type of CBCT, field of view (FOV) size, milliamperage, peak kilovoltage (kVp), and voxel size. The beam-hardening artifact was the most widely reported, and it was minimized in protocols with a smaller FOV, larger voxels, and higher kVp. Conclusion The risk and benefit of these protocols in individuals with dental implants must be considered, and clinical examinations and complementary radiographs play an essential role in implantology.

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Section: Resultsmentioning

confidence: 99%

“…The articles included in this review presented in vitro studies (n=7) 18 19 20 21 23 25 26 and clinical studies with tomography of patients (n=2). 22 24 They were carried out in Brazil (n=3), Switzerland (n=2), Germany (n=1), Japan (n=1), Iran (n=1), and USA/Turkey (n=1).…”

Section: Resultsmentioning

confidence: 99%

Cone-beam computed tomography artifacts in the presence of dental implants and associated factors: an integrative review

et al. 2021

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“…For beam hardening artifact, it is advisable to reduce the field of view (FOV) [9] to avoid scanning regions susceptible to beam hardening (e.g., metallic restorations, dental implants), which can be achieved by collimation, modification of patient positioning, or separation of the dental arches [3]. Dark spaces around implants are due to beam hardening artifact ( Figure 9)and should not be interpreted as peri-implantitis.…”

Section: Discussionmentioning

confidence: 99%

“…(Figures 5,8,9,10,11, 14, 15). This artifact is related to the presence of dental amalgam(Figures 4, 5), to crowns and bridges (Figure 6-8), and to dental implants(Figure 9).…”

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confidence: 99%

Artifacts related to cone beam computed tomography technology (CBCT) and their significance for clinicians: illustrated review of medical literature.

Olszewski¹

2020

Nemesis

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Objective: to explain the meaning and to illustrate technical artifacts (aliasing as well as the ring artifact) and beam hardening (metal artifact) that can be present in the dentomaxillofacial cone beam computed tomography (CBCT), and to check the accessibility of free illustrations of these artifacts in medical publications. Material and methods: One observer applied five search equations using database PubMed. The exclusion criteria were: experimental studies, animal studies, studies not related to dentomaxillofacial area, and articles with closed access. There was no time limit for the search of articles. We limited our search to English and French language. Results: Only 3 articles out of 434 publications were retained after application of inclusion/exclusion criteria. In these articles only 4 annotated figures were freely accessible in medical publications from PubMed. In this paper we presented examples of aliasing, ring artifact, and beam artifacts from I-CAT, Carestream 9000 3D (Kodak), and Planmeca Promax 3D Mid CBCT. The intensity of beam hardening artifact varies from major degradation of image (i.e., subperiosteal implants, bridges, crowns, dental implants, and orthodontic fix appliances), through mean degradation (screws securing titanium mesh, head of mini-implant) to no beam hardening on metallic devices (orthodontic anchorage, orthodontic contention wire) or on dense objects (endodontic treatments, impression materials, Lego box). Some beam hardening artifacts arising from nasal piercing, hairs, or hearing aid device may be present on the image but they will not disturb the evaluation of the field of view. Conclusions: reduction of aliasing artifact is related with the improvement of detectors quality. The presence of ring artifact means that CBCT device has lost its calibration. The field of view (FOV) needs to be reduce in order to avoid scanning regions susceptible to beam hardening (e.g., metallic restorations, dental implants). Finally, the accessibility to open knowledge on technique -related CBCT artifacts seems extremely limited when searching at PubMed database.

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“…Therefore, assessment of the bone near these artefacts became complicated and inaccurate. Especially it is important when postoperative follow-ups are performed [29,30]. The other limitation of the proposed method is the difficulty to segment areas with low density (thin anatomical areas, e.g., alveolar part of the mandible, mandibular condyles or areas of maxillary sinuses) in CBCT images [31].…”

Section: Discussionmentioning

confidence: 99%

Automatic Method for Bone Segmentation in Cone Beam Computed Tomography Data Set

Vaitiekūnas

Jegelevičius

Sakalauskas³

et al. 2019

Applied Sciences

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Due to technical aspects of Cone Beam Computed Tomography (CBCT), the automatic methods for bone segmentation are not widely used in the clinical practice of endodontics, orthodontics, oral and maxillofacial surgery. The aim of this study was to evaluate method’s accuracy for bone segmentation in CBCT data sets. The sliding three dimensional (3D) window, histogram filter and Otsu’s method were used to implement the automatic segmentation. The results of automatic segmentation were compared with the results of segmentation performed by an experienced oral and maxillofacial surgeon. Twenty patients and their forty CBCT data sets were used in this study (20 preoperative and 20 postoperative). Intraclass Correlation Coefficients (ICC) were calculated to prove the reliability of surgeon segmentations. ICC was 0.958 with 95% confidence interval [0.896 ... 0.983] in preoperative data sets and 0.931 with 95% confidence interval [0.836 ... 0.972] in postoperative data sets. Three basic metrics were used in order to evaluate the accuracy of the automatic method—Dice Similarity Coefficient (DSC), Root Mean Square (RMS), Average Distance Error (ADE) of surfaces mismatch and additional metric in order to evaluate computation time of segmentation was used. The mean value of preoperative DSC was 0.921, postoperative—0.911, the mean value of preoperative RMS was 0.559 mm, postoperative—0.647 mm, the ADE value of preoperative cases was 0.043 mm, postoperative—0.057 mm, the mean computational time to perform the segmentation was 46 s. The automatic method showed clinically acceptable accuracy results and thus can be used as a new tool for automatic bone segmentation in CBCT data. It can be applied in oral and maxillofacial surgery for performance of 3D Virtual Surgical Plan (VSP) or for postoperative follow-up.

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Effect of exposure parameters of cone beam computed tomography on metal artifact reduction around the dental implants in various bone densities

Cited by 25 publications

References 25 publications

Cone-beam computed tomography artifacts in the presence of dental implants and associated factors: an integrative review

Cone-beam computed tomography artifacts in the presence of dental implants and associated factors: an integrative review

Artifacts related to cone beam computed tomography technology (CBCT) and their significance for clinicians: illustrated review of medical literature.

Automatic Method for Bone Segmentation in Cone Beam Computed Tomography Data Set

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