The Experts below are selected from a list of 213 Experts worldwide ranked by ideXlab platform
Bahareh Hekmat - One of the best experts on this subject based on the ideXlab platform.
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Evaluation of the efficacy of the metal artifact reduction algorithm in the detection of a vertical root fracture in endodontically treated teeth in cone-beam computed tomography images: An in vitro study
Dental and Medical Problems, 2019Co-Authors: Samira Saati, Amir Eskandarloo, Alireza Falahi, Leili Tapak, Bahareh HekmatAbstract:BACKGROUND Three-dimensional (3D) cone-beam computed tomography (CBCT) scans play an important role in Dental diagnostics and treatment planning, especially in detecting vertical root fractures (VRFs). However, artifacts caused by high-density Dental materials can negatively affect the quality of CBCT images by decreasing contrast and masking structures. OBJECTIVES The aim of this study was to assess the efficacy of artifact removal software in detecting VRFs in endodontically treated teeth on CBCT scans. MATERIAL AND METHODS This study evaluated 70 endodontically treated single-rooted teeth. Half of the teeth were cracked by introducing a wedge into the canal and tapping gently with a hammer; the rest remained untouched as a control group. The teeth were then mounted in a bovine rib bone. Soft tissue was simulated using red Dental Wax. Cone-beam computed tomography scans were taken using the NewTom® 3G, ProMax® 3D and Cranex® 3D CBCT systems, and the MATLAB software was applied. The images were evaluated by 2 oral and maxillofacial radiologists, and the results were recorded in a checklist. The data was analyzed using the κ coefficient, McNemar's test and the receiver operating characteristic (ROC) curves. RESULTS A significant inter-observer agreement was noted between the 2 observers in detecting VRFs using all CBCT systems. In all systems, the use of the MATLAB software improved the detection of VRFs, but the difference was not significant in the NewTom 3G (p = 0.119) and ProMax 3D (p = 0.455) systems. However, the difference was significant in the Cranex 3D system (p = 0.039). CONCLUSIONS The MATLAB artifact removal software can enhance the detection of VRFs on CBCT scans to some extent.
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Evaluation of the efficacy of the metal artifact reduction algorithm in the detection of a vertical root fracture in endodontically treated teeth in cone-beam computed tomography images: An in vitro study Ocena skuteczności algorytmu redukującego art
2019Co-Authors: Samira Saati, Amir Eskandarloo, Alireza Falahi, Leili Tapak, Bahareh HekmatAbstract:Background. Three-dimensional (3D) cone-beam computed tomography (CBCT) scans play an important role in Dental diagnostics and treatment planning, especially in detecting vertical root fractures (VRFs). However, artifacts caused by high-density Dental materials can negatively affect the quality of CBCT images by decreasing contrast and masking structures. Objectives. The aim of this study was to assess the efficacy of artifact removal software in detecting VRFs in endodontically treated teeth on CBCT scans. Material and methods. This study evaluated 70 endodontically treated single-rooted teeth. Half of the teeth were cracked by introducing a wedge into the canal and tapping gently with a hammer; the rest remained untouched as a control group. The teeth were then mounted in a bovine rib bone. Soft tissue was simulated using red Dental Wax. Cone-beam computed tomography scans were taken using the NewTom® 3G, ProMax® 3D and Cranex® 3D CBCT systems, and the MATLAB software was applied. The images were evaluated by 2 oral and maxillofacial radiologists, and the results were recorded in a checklist. The data was analyzed using the κ coefficient, McNemar’s test and the receiver operating characteristic (ROC) curves. Results. A significant inter-observer agreement was noted between the 2 observers in detecting VRFs using all CBCT systems. In all systems, the use of the MATLAB software improved the detection of VRFs, but the difference was not significant in the NewTom 3G (p = 0.119) and ProMax 3D (p = 0.455) systems. However, the difference was significant in the Cranex 3D system (p = 0.039). Conclusions. The MATLAB artifact removal software can enhance the detection of VRFs on CBCT scans to some extent. © 2019 by Wroclaw Medical University.
J G Clement - One of the best experts on this subject based on the ideXlab platform.
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3-D imaging and quantitative comparison of human dentitions and simulated bite marks
International Journal of Legal Medicine, 2007Co-Authors: S. A. Blackwell, R. V. Taylor, C. L. Ogleby, M. R. Donald, Tsutomu Tanijiri, I Gordon, M. Yoshino, J G ClementAbstract:This study presents a technique developed for 3-D imaging and quantitative comparison of human dentitions and simulated bite marks. A sample of 42 study models and the corresponding bites, made by the same subjects in acrylic Dental Wax, were digitised by laser scanning. This technique allows image comparison of a 3-D dentition with a 3-D bite mark, eliminating distortion due to perspective as experienced in conventional photography. Cartesian co-ordinates of a series of landmarks were used to describe the dentitions and bite marks, and a matrix was created to compare all possible combinations of matches and non-matches using cross-validation techniques. An algorithm, which estimated the probability of a dentition matching its corresponding bite mark, was developed. A receiver operating characteristic graph illustrated the relationship between values for specificity and sensitivity. This graph also showed for this sample that 15% of non-matches could not be distinguished from the true match, translating to a 15% probability of falsely convicting an innocent person.
Norou Diawara - One of the best experts on this subject based on the ideXlab platform.
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testing a novel 3d printed radiographic imaging device for use in forensic odontology
Journal of Forensic Sciences, 2017Co-Authors: Tara L Newcomb, Ann M Bruhn, Bridget Giles, Hector M Garcia, Norou DiawaraAbstract:There are specific challenges related to forensic Dental radiology and difficulties in aligning X-ray equipment to teeth of interest. Researchers used 3D printing to create a new device, the combined holding and aiming device (CHAD), to address the positioning limitations of current Dental X-ray devices. Participants (N = 24) used the CHAD, soft Dental Wax, and a modified external aiming device (MEAD) to determine device preference, radiographer’s efficiency, and technique errors. Each participant exposed six X-rays per device for a total of 432 X-rays scored. A significant difference was found at the 0.05 level between the three devices (p = 0.0015), with the MEAD having the least amount of total errors and soft Dental Wax taking the least amount of time. Total errors were highest when participants used soft Dental Wax—both the MEAD and the CHAD performed best overall. Further research in forensic Dental radiology and use of holding devices is needed.
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testing a novel 3d printed radiographic imaging device for use in forensic odontology
Journal of Forensic Sciences, 2017Co-Authors: Tara L Newcomb, Hector M Garcia, Idge Giles, Norou DiawaraAbstract:There are specific challenges related to forensic Dental radiology and difficulties in aligning X-ray equipment to teeth of interest. Researchers used 3D printing to create a new device, the combined holding and aiming device (CHAD), to address the positioning limitations of current Dental X-ray devices. Participants (N = 24) used the CHAD, soft Dental Wax, and a modified external aiming device (MEAD) to determine device preference, radiographer’s efficiency, and technique errors. Each participant exposed six X-rays per device for a total of 432 X-rays scored. A significant difference was found at the 0.05 level between the three devices (p = 0.0015), with the MEAD having the least amount of total errors and soft Dental Wax taking the least amount of time. Total errors were highest when participants used soft Dental Wax—both the MEAD and the CHAD performed best overall. Further research in forensic Dental radiology and use of holding devices is needed.
Samira Saati - One of the best experts on this subject based on the ideXlab platform.
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Evaluation of the efficacy of the metal artifact reduction algorithm in the detection of a vertical root fracture in endodontically treated teeth in cone-beam computed tomography images: An in vitro study
Dental and Medical Problems, 2019Co-Authors: Samira Saati, Amir Eskandarloo, Alireza Falahi, Leili Tapak, Bahareh HekmatAbstract:BACKGROUND Three-dimensional (3D) cone-beam computed tomography (CBCT) scans play an important role in Dental diagnostics and treatment planning, especially in detecting vertical root fractures (VRFs). However, artifacts caused by high-density Dental materials can negatively affect the quality of CBCT images by decreasing contrast and masking structures. OBJECTIVES The aim of this study was to assess the efficacy of artifact removal software in detecting VRFs in endodontically treated teeth on CBCT scans. MATERIAL AND METHODS This study evaluated 70 endodontically treated single-rooted teeth. Half of the teeth were cracked by introducing a wedge into the canal and tapping gently with a hammer; the rest remained untouched as a control group. The teeth were then mounted in a bovine rib bone. Soft tissue was simulated using red Dental Wax. Cone-beam computed tomography scans were taken using the NewTom® 3G, ProMax® 3D and Cranex® 3D CBCT systems, and the MATLAB software was applied. The images were evaluated by 2 oral and maxillofacial radiologists, and the results were recorded in a checklist. The data was analyzed using the κ coefficient, McNemar's test and the receiver operating characteristic (ROC) curves. RESULTS A significant inter-observer agreement was noted between the 2 observers in detecting VRFs using all CBCT systems. In all systems, the use of the MATLAB software improved the detection of VRFs, but the difference was not significant in the NewTom 3G (p = 0.119) and ProMax 3D (p = 0.455) systems. However, the difference was significant in the Cranex 3D system (p = 0.039). CONCLUSIONS The MATLAB artifact removal software can enhance the detection of VRFs on CBCT scans to some extent.
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Evaluation of the efficacy of the metal artifact reduction algorithm in the detection of a vertical root fracture in endodontically treated teeth in cone-beam computed tomography images: An in vitro study Ocena skuteczności algorytmu redukującego art
2019Co-Authors: Samira Saati, Amir Eskandarloo, Alireza Falahi, Leili Tapak, Bahareh HekmatAbstract:Background. Three-dimensional (3D) cone-beam computed tomography (CBCT) scans play an important role in Dental diagnostics and treatment planning, especially in detecting vertical root fractures (VRFs). However, artifacts caused by high-density Dental materials can negatively affect the quality of CBCT images by decreasing contrast and masking structures. Objectives. The aim of this study was to assess the efficacy of artifact removal software in detecting VRFs in endodontically treated teeth on CBCT scans. Material and methods. This study evaluated 70 endodontically treated single-rooted teeth. Half of the teeth were cracked by introducing a wedge into the canal and tapping gently with a hammer; the rest remained untouched as a control group. The teeth were then mounted in a bovine rib bone. Soft tissue was simulated using red Dental Wax. Cone-beam computed tomography scans were taken using the NewTom® 3G, ProMax® 3D and Cranex® 3D CBCT systems, and the MATLAB software was applied. The images were evaluated by 2 oral and maxillofacial radiologists, and the results were recorded in a checklist. The data was analyzed using the κ coefficient, McNemar’s test and the receiver operating characteristic (ROC) curves. Results. A significant inter-observer agreement was noted between the 2 observers in detecting VRFs using all CBCT systems. In all systems, the use of the MATLAB software improved the detection of VRFs, but the difference was not significant in the NewTom 3G (p = 0.119) and ProMax 3D (p = 0.455) systems. However, the difference was significant in the Cranex 3D system (p = 0.039). Conclusions. The MATLAB artifact removal software can enhance the detection of VRFs on CBCT scans to some extent. © 2019 by Wroclaw Medical University.
Challapalli Srinivas - One of the best experts on this subject based on the ideXlab platform.
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Wax Tissue Compensator for Head and Neck Radiotherapy - Fabrication and Dosimetric Evaluation
The Journal of Cancer Research, 2015Co-Authors: Challapalli SrinivasAbstract:For a photon field of size 20x20cm in a telecobalt machine with ‘Source Diaphragm Distance (SDD)’ of 45 cm, DWTC is designed to provide compensation at ‘source skin distance (SSD)’ of 80 cm. A jig stand with 3 acrylic perforated sheets kept together at specified gaps allow required radial divergence of the metal spokes on equally spaced grid. Dose compensator could be fabricated by a tray mounted on the top side of the jig, using molten Dental Wax by measuring patient anatomy created by a positive of ‘Plaster of Paris’ (POP).
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SU-E-E-14: Fabrication of Divergent Wax Based Tissue Compensators for Head and Neck Radiotherapy
Medical Physics, 2011Co-Authors: Challapalli Srinivas, K Shenoy, V Shenoy, B Kulal, R Ravichandran, S SupeAbstract:Purpose: Tissue obliquity is a common problem in conventional radiotherapy to head and neck region. This results in generation of hot spots and non‐uniformity of dose in the planned treatment volumes. Ellis compensators made of non divergent aluminum metal rods have been suggested. The purpose of this study is to develop a divergent Wax based tissue compensator (DWTC) to address tissue obliquity and verify it dosimetrically before clinical implementation. Methods: A method is developed for a photon field of size 20 cm × 20 cm from a telecobalt machine having Source Skin Distance (SSD) of 80 cm and Source Diaphragm Distance (SDD) of 45 cm. A jig was made with 3 Perspex sheets kept at specified distances which were perforated to allow radial divergence of metal spokes (depicting pencil beams) to pass through. Dose compensator is fabricated with Dental Wax based on the measured tissue thickness variations in different planes. Patient anatomy was reproduced on a POP which was placed at the bottom of the jig and a divergent compensator was developed at the top of the jig by placing Wax on the upper end of the metal spokes. The efficacy of DWTC in the treatment plane was confirmed with Imatrix device using a wedge shaped and two semi neck water phantoms with and without compensators. Results: The profiles with and without compensator verified by Imatrix device showed adequate tissue compensation for clinical purposes. The uniformity of the dose in the treatment region is well within 3%, 3mm criteria (dose evaluation parameter). Conclusions: The method developed for DWTC could be adopted for a linear accelerator with different SSD and SDD. The entire process of making a DWTC is simple, accurate and can be easily fabricated.