scholarly journals Cone beam CT scans with and without artefact reduction in root fracture detection of endodontically treated teeth

2013 ◽  
Vol 42 (5) ◽  
pp. 20120245 ◽  
Author(s):  
B Bechara ◽  
C Alex McMahan ◽  
WS Moore ◽  
M Noujeim ◽  
FB Teixeira ◽  
...  
Keyword(s):  
Cone Beam Ct ◽  
Ct Scans ◽  
Cone Beam ◽  
Fracture Detection ◽  
Endodontically Treated Teeth ◽  
Root Fracture ◽  
Artefact Reduction

scholarly journals Evaluation of Root Fracture in endodontically treated Teeth using Cone Beam Computed Tomography

2017 ◽  
Vol 18 (2) ◽  
pp. 94-99 ◽  
Author(s):  
Ricardo Raitz ◽  
Mariana Tiepo ◽  
Gabriel Magrin ◽  
Ana C Kovalik ◽  
Belkiss Marmora ◽  
...  
Keyword(s):  
Computed Tomography ◽  
Cone Beam Computed Tomography ◽  
Testing Machine ◽  
Kappa Statistic ◽  
Cone Beam ◽  
Fracture Detection ◽  
Kappa Index ◽  
Operating Characteristics ◽  
Endodontically Treated Teeth ◽  
Root Fracture

ABSTRACT Aim Our objective was to perform an in vitro evaluation of root fracture in endodontically treated teeth using two cone beam computed tomography (CBCT) machines. Materials and methods The sample comprised 86 singlerooted human premolars that had been fractured by a universal testing machine. The tomographic images were acquired using an Orthopantomograph OP300® and an Orthophos XG 3D® and evaluated by three examiners, by means of specific software. The teeth were classified into presence or absence of root fracture, then the root third where the fracture occurred, was determined. With regard to the detection of the fracture, the Kappa statistic was used for intra and interexaminer reproducibility at two distinct points in time. Chi-squared test was employed to analyze the sensitivity and specificity of the two tomographs (p < 0.05). Results The results showed a good or excellent Kappa index between examiners. As for the absolute frequency, the sensitivity (0.6) of the Orthophos XG 3D® equipment was superior, while specificity (0.91) was higher with the Orthopantomograph OP300®. On the receiver operating characteristics curve, moderate performance was found with an accuracy of 0.73 (OrthopantomographOP300®) and 0.74 (Orthophos XG 3D®) respectively. As far as the location of the root fracture is concerned, moderate agreement was verified using the Kappa statistic (k = 0.56). Conclusion Although the regular CBCTs represent the imaging examination of choice for assisting root fracture diagnosis in endodontically treated teeth, their performance in this study demonstrated an imprecise diagnosis of fractures in a good many cases, irrespective of the tomography machine used. Clinical significance An early and precise detection of root fractures is of the utmost clinical importance, but the radiopaque and/or metallic filling materials in the CBCT viewing field may generate artifacts, known as the beam-hardening effect, which could compromise root fracture detection. How to cite this article Tiepo M, Magrin G, Kovalik AC, Marmora B, Silva MF, Raitz R. Evaluation of Root Fracture in endodontically treated Teeth using Cone Beam Computed Tomography. J Contemp Dent Pract 2017;18(2):94-99.

scholarly journals Difference in the artefacts production and the performance of the metal artefact reduction (MAR) tool between the buccal and lingual cortical plates adjacent to zirconium dental implant

2019 ◽  
Vol 48 (8) ◽  
pp. 20190058 ◽  
Author(s):  
Eduarda Helena Leandro Nascimento ◽  
Rocharles Cavalcante Fontenele ◽  
Gustavo Machado Santaella ◽  
Deborah Queiroz Freitas
Keyword(s):  
Cone Beam Ct ◽  
Ct Scans ◽  
Cone Beam ◽  
Control Group ◽  
Medullary Bone ◽  
Trabecular Thickness ◽  
Metal Artefact Reduction ◽  
Water Region ◽  
Metal Artefact ◽  
Artefact Reduction

Objectives: To quantify the artefacts production and the performance of the metal artefact reduction (MAR) tool, enabled before or after the acquisition, in cortical plates (buccal and lingual) and other regions adjacent to zirconium implants. Methods: Cone beam CT scans were acquired using the OP300 Maxio unit before (control group) and after (implant group) the insertion of a zirconium implant into the posterior region of a dry mandible. Three conditions of MAR tool were tested: “without MAR”, with “MAR activated after acquisition”, and with “MAR activated before acquisition”. The standard deviation (SD), contrast-to-noise ratio (CNR) and voxel values were calculated in the buccal and lingual cortical plates, medullary bone and water region, close to the implant. The structural bone analysis was performed in the medullary bone close to the implant. Results: Overall, in control and implant groups, the lingual cortical had higher SD, lower CNR and lower voxel values than the buccal cortical, regardless of the MAR condition (p < 0.05). Implant caused higher SD values and lower voxel values in adjacent regions “without MAR” (p < 0.05). MAR activation decreased SD and changed voxel values when the implant was present, regardless of MAR activation mode (p < 0.05). The activation of MAR increased the trabecular thickness values for the implant group (p < 0.05). Conclusion: The expression of artefacts adjacent to zirconium implants is greater in the lingual than in the buccal cortical. The greater the expression of artefacts in this region, the greater the effectiveness of the MAR tool in homogenizing the grey values, regardless of the time of its activation.

Improved image quality of cone beam CT scans for radiotherapy image guidance using fiber-interspaced antiscatter grid

2014 ◽  
Vol 41 (6Part1) ◽  
pp. 061910 ◽  
Author(s):  
Uros Stankovic ◽  
Marcel van Herk ◽  
Lennert S. Ploeger ◽  
Jan-Jakob Sonke
Keyword(s):  
Image Quality ◽  
Image Guidance ◽  
Cone Beam Ct ◽  
Ct Scans ◽  
Cone Beam ◽  
Antiscatter Grid

scholarly journals EP-1854: Variations of coefficients for estimating effective doses of cone beam CT scans

2018 ◽  
Vol 127 ◽  
pp. S1000-S1001
Author(s):  
A. Abuhaimed ◽  
C.J. Martin ◽  
O. Demirkaya
Keyword(s):  
Cone Beam Ct ◽  
Ct Scans ◽  
Cone Beam ◽  
Effective Doses

scholarly journals Patient Knowledge Regarding Radiation Exposure from Orthopaedic Foot and Ankle Imaging

2018 ◽  
Vol 3 (3) ◽  
pp. 2473011418S0015
Author(s):  
Daniel Bohl ◽  
Blaine Manning ◽  
George Holmes ◽  
Simon Lee ◽  
Johnny Lin ◽  
...  
Keyword(s):  
Ionizing Radiation ◽  
Ct Scan ◽  
Radiation Exposure ◽  
Cone Beam Ct ◽  
Plain Film ◽  
Ct Scans ◽  
Cone Beam ◽  
X Rays ◽  
Foot And Ankle ◽  
X Ray

Category: Other Introduction/Purpose: Foot and ankle surgeons routinely prescribe diagnostic imaging that exposes patients to potentially harmful ionizing radiation. The purpose of this study is to characterize patients’ knowledge regarding radiation exposure associated with common forms of foot and ankle imaging. Methods: A survey was administered to all new patients prior to their first foot and ankle clinic appointments. Patients were asked to compare the amount of harmful radiation associated with chest x-rays to that associated with various types of foot and ankle imaging. Results were tabulated and compared to actual values of radiation exposure from the published literature. Results: A total of 890 patients were invited to participate, of whom 791 (88.9%) completed the survey. The majority of patients believed that a foot x-ray, an ankle x-ray, a “low dose” CT scan of the foot and ankle (alluding to cone-beam CT), and a traditional CT scan of the foot and ankle all contain similar amounts of harmful ionizing radiation to a chest x-ray (Table 1). This is in contrast to the published literature, which suggests that foot x-rays, ankle x-rays, cone beam CT scans of the foot and ankle, and traditional CT scans of the foot and ankle expose patients to 0.006, 0.006, 0.127, and 0.833 chest x-rays worth of radiation. Conclusion: The results of the present study suggest that patients greatly over-estimate the amount of harmful ionizing radiation associated with plain film and cone-beam CT scans of the foot and ankle. Interestingly, their estimates of radiation associated with traditional CT scans of the foot and ankle were relatively accurate. Results suggest that patients may benefit from increased counseling by surgeons regarding the relatively low risk of radiation exposure associated with plain film and cone-beam CT imaging of the foot and ankle.

Quantification of intra-fraction changes during radiotherapy of cervical cancer assessed with pre- and post-fraction Cone Beam CT scans

2015 ◽  
Vol 117 (3) ◽  
pp. 536-541 ◽  
Author(s):  
Sabrina T. Heijkoop ◽  
Thomas R. Langerak ◽  
Sandra Quint ◽  
Jan Willem M. Mens ◽  
Andras G. Zolnay ◽  
...  
Keyword(s):  
Cervical Cancer ◽  
Cone Beam Ct ◽  
Ct Scans ◽  
Cone Beam
Sign in / Sign up

Export Citation Format

Share Document