Artifacts: The downturn of CBCT image

Nagarajappa, Anil Kumar; Dwivedi, Neha; Tiwari, Rana

doi:10.4103/2231-0762.170523

Cited by 97 publications

(24 citation statements)

References 21 publications

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“…An artifact is any distortion or error in the image that has no relationship to the subject being studied, 15 and for CT images specifically, artifacts are any systematic discrepancies between the CT numbers in the reconstructed image and the expected CT numbers based on the true coefficient of linear attenuation of the studied object. 5 16 Those artifacts appear in CT images as dark bands, dark lines, and streaks.…”

Section: Discussionmentioning

confidence: 99%

Quantitative assessment of image artifacts from root filling materials on CBCT scans made using several exposure parameters

et al. 2017

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PurposeTo quantify artifacts from different root filling materials in cone-beam computed tomography (CBCT) images acquired using different exposure parameters.Materials and MethodsFifteen single-rooted teeth were scanned using 8 different exposure protocols with 3 different filling materials and once without filling material as a control group. Artifact quantification was performed by a trained observer who made measurements in the central axial slice of all acquired images in a fixed region of interest using ImageJ. Hyperdense artifacts, hypodense artifacts, and the remaining tooth area were identified, and the percentages of hyperdense and hypodense artifacts, remaining tooth area, and tooth area affected by the artifacts were calculated. Artifacts were analyzed qualitatively by 2 observers using the following scores: absence (0), moderate presence (1), and high presence (2) for hypodense halos, hypodense lines, and hyperdense lines. Two-way ANOVA and the post-hoc Tukey test were used for quantitative and qualitative artifact analysis. The Dunnet test was also used for qualitative analysis. The significance level was set at P<.05.ResultsThere were no significant interactions among the exposure parameters in the quantitative or qualitative analysis. Significant differences were observed among the studied filling materials in all quantitative analyses. In the qualitative analyses, all materials differed from the control group in terms of hypodense and hyperdense lines (P<.05). Fiberglass posts did not differ statistically from the control group in terms of hypodense halos (P>.05).ConclusionDifferent exposure parameters did not affect the objective or subjective observations of artifacts in CBCT images; however, the filling materials used in endodontic restorations did affect both types of assessments.

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Section: Discussionmentioning

confidence: 99%

Quantitative assessment of image artifacts from root filling materials on CBCT scans made using several exposure parameters

et al. 2017

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“…The latter is explained by the fact that when a homogeneous cylindrical structure is imaged, the energy of the X-rays passing through the center of the volume is "hardened" at a greater level than at the periphery of the object. This leads to a saucer-like shape in the reconstructed image: transparency (i.e., lower grayscale values) in the center area of the scanned object, which decreases steadily as the periphery of the cylindrical structure [15]. The reconstruction algorithm projects back a gray value to a voxel according to a particular pixel of the detector on which the intensity of the attenuated X-ray beam was recorded.…”

Section: Artifactsmentioning

confidence: 99%

Cone-Beam Computed Tomography in Dentomaxillofacial Radiology

Szabó¹,

Dobai²,

Dobó‐Nagy³

2020

Novel Imaging and Spectroscopy

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The daily application of cone-beam computed tomography (CBCT) has been increasing. Not only the number of referrals has been raising, but also the variety of the anatomical regions requested for imaging is also growing in the dentomaxillofacial area. Even though computed tomography (CT) has been widely used in the head and neck region, by the invention of CBCT, some of the drawbacks of CT were overcome and turned into the advantages of the CBCT appliances, such as lower patient dose. In this chapter, we provide a comprehensive picture of the everyday use of CBCT as a modality in the dentomaxillofacial region and its current limitations and expected improvements.

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“…Furthermore, structures that do not exist in the actual subject may appear in the image due to the patient motion, image capturing, and the process of reconstruction. The CT artifacts can include noise, motion, beam hardening, scatter, and metal artifacts [ 20 ].…”

Section: Reviewmentioning

confidence: 99%

Clinical Anatomy and Significance of the Retromolar Foramina and Their Canals: A Literature Review

Truong

Adeeb

et al. 2017

Cureus

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The retromolar foramina (RMF) and the retromolar canal (RMC) are anatomic variants in the mandible located distally to the last molar. The retromolar nerve, which runs through the RMC, is a type 1 bifidity of the mandibular canal. The investigations of the RMF and RMC have been performed by dry mandible studies, the panoramic radiograph (PAN), computed tomography (CT), and the cone beam computed tomography (CBCT) studies. The CBCT has been shown to be the superior method for visualizing the RMF and RMC. There is wide variation in the frequency, location, diameter, and distance of the canal in different individuals. Overall, there is no significant difference in the frequency of the canal in the mandible between sexes or sides of the mandible. The peak incidence of the RMF may occur in adolescence. The RMC is significant due to the neurovascular bundle which runs through it. Injury to this neurovascular bundle during surgical procedures, such as third molar extraction, implant placement, or split sagittal osteotomy, may lead to paresthesia, excessive bleeding, or traumatic neuroma. The presence of RMC may also lead to insufficient anesthesia in the mandible which may be overcome with alternative anesthetic techniques.

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Artifacts: The downturn of CBCT image

Cited by 97 publications

References 21 publications

Quantitative assessment of image artifacts from root filling materials on CBCT scans made using several exposure parameters

Quantitative assessment of image artifacts from root filling materials on CBCT scans made using several exposure parameters

Cone-Beam Computed Tomography in Dentomaxillofacial Radiology

Clinical Anatomy and Significance of the Retromolar Foramina and Their Canals: A Literature Review

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