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Cone beam computed tomography

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https://www.readbyqxmd.com/read/29339036/a-cone-beam-computed-tomography-study-of-c-shaped-root-canal-systems-in-mandibular-second-premolars-in-a-taiwan-chinese-subpopulation
#1
Yi-Chin Chen, Chia-Lun Tsai, Yi-Chen Chen, Gin Chen, Shue-Fen Yang
BACKGROUND/PURPOSE: The purpose of this study is to investigate the prevalence and the morphologic characteristics of the radicular groove and root canal system in human mandibular second premolars with C-shaped root in a Taiwan Chinese subpopulation using cone-beam computed tomographic (CBCT) imaging. METHODS: CBCT images of 580 mandibular second premolars were collected from 317 patients. All of the mandibular second premolars were examined in serial axial sections to identify the presence of any C-shaped root and C-shaped canal systems...
January 12, 2018: Journal of the Formosan Medical Association, Taiwan Yi Zhi
https://www.readbyqxmd.com/read/29338860/learning-curve-of-image-guided-video-assisted-thoracoscopic-surgery-for-small-pulmonary-nodules-a-prospective-analysis-of-30-initial-patients
#2
Ming-Ju Hsieh, Chih-Tsung Wen, Hsin-Yueh Fang, Yu-Wen Wen, Chien-Cheng Lin, Yin-Kai Chao
OBJECTIVES: The use of image-guided video-assisted thoracoscopic surgery for simultaneous localization and removal of small solitary pulmonary nodules in a hybrid operation room using C-arm cone-beam computed tomography is gaining momentum. We sought to assess the effect of the learning curve on procedural parameters and clinical outcomes of image-guided video-assisted thoracoscopic surgery for treating patients with small solitary pulmonary nodules. METHODS: Clinical variables and treatment outcomes of the 30 initial patients with solitary pulmonary nodules who were treated with image-guided video-assisted thoracoscopic surgery at Chang Gung Memorial Hospital (Taiwan) were prospectively analyzed...
December 13, 2017: Journal of Thoracic and Cardiovascular Surgery
https://www.readbyqxmd.com/read/29338272/morphologic-assessment-of-mandibular-anterior-teeth-root-canal-using-cbct
#3
Sina Haghanifar, Ehsan Moudi, Ali Bijani, Mohammad Kazemi Ghanbarabadi
OBJECTIVE: The aim of this study was to evaluate the number and morphological characteristics of the roots and root canals in mandibular anterior teeth, using cone beam computed tomography. METHODS AND MATERIALS: In this cross-sectional study, 1053 anterior mandibular teeth from 200 CBCT scans were evaluated. The teeth were completely developed and should have had no fillings in the root or crown. The teeth were investigated in terms of the number of roots and root canals, the location of the apical foramen, the distance of the apical foramen to the anatomical apex, root length, crown length, dilacerations and the type of canals according to Vertucci's classification...
November 2017: Acta Medica Academica
https://www.readbyqxmd.com/read/29337632/the-usefulness-of-cone-beam-computed-tomography-gray-values-for-alveolar-bone-linear-measurements
#4
Soumya Padala, Boon Ching Tee, Frank M Beck, Kathy Elias, Do-Gyoon Kim, Zongyang Sun
OBJECTIVES: To test a proof-of-concept that the accuracy and reliability of alveolar bone height measurements from orthodontic grade (large field-of-view [FOV], large voxel-size) cone-beam computed tomography (CBCT) images may be improved by using pixel gray values. MATERIALS AND METHODS: Twenty fresh cadaver pig heads underwent CBCT scans (17 × 23 cm FOV, 0.4-mm voxel size). Buccal alveolar bone heights of maxillary first molars were measured using the conventional vision-based (VB) and the proposed gray value-assisted (GVA) methods...
January 16, 2018: Angle Orthodontist
https://www.readbyqxmd.com/read/29333959/a-noninvasive-body-setup-method-for-radiotherapy-by-using-a-multimodal-image-fusion-technique
#5
Jie Zhang, Ying Chen, Yunxia Chen, Chenchen Wang, Jing Cai, Kaiyue Chu, Jianhua Jin, Yun Ge, Xiaolin Huang, Yue Guan, Weifeng Li
PURPOSE: To minimize the mismatch error between patient surface and immobilization system for tumor location by a noninvasive patient setup method. MATERIALS AND METHODS: The method, based on a point set registration, proposes a shift for patient positioning by integrating information of the computed tomography scans and that of optical surface landmarks. An evaluation of the method included 3 areas: (1) a validation on a phantom by estimating 100 known mismatch errors between patient surface and immobilization system...
December 2017: Technology in Cancer Research & Treatment
https://www.readbyqxmd.com/read/29333774/-a-cone-beam-computed-tomography-study-on-the-anatomical-position-of-accessory-mandibular-foramina-in-jiangxi-adults
#6
Ke Xing, Li Bohan, Chen Linlin, Jiang Xindi
OBJECTIVE: This study used cone beam computed tomography (CBCT) to access the distribution and position of accessory mandibular foramina in the mandibular body of Jiangxi adults, and some safety rules of operation for clinics were provided. METHODS: Two hundred CBCT image subjects of Jiangxi adults were selected, which were divided into 4 groups by age with the same sex ratio. The number and position of accessory mandibular foramina in mandibular anterior teeth, premolars and molars region were described and the relationship between accessory mandibular foramina incidence and factors of age, gender and lateral were analyzed...
December 1, 2017: Hua Xi Kou Qiang Yi Xue za Zhi, Huaxi Kouqiang Yixue Zazhi, West China Journal of Stomatology
https://www.readbyqxmd.com/read/29333773/-influence-of-positional-relationship-between-the-long-axis-of-the-mandibular-anterior-teeth-and-the-alveolar-bone-on-the-treatment-design-of-dental-implants
#7
Yu Tiantian, Pu Bishuang, Liu Jin, Xia Yulan, Wang Gang, Lan Jing
OBJECTIVE: This study aimed at investigating and measuring the positional relationship between the long axis of the mandibular anterior teeth and the alveolar bone using cone beam computed tomography (CBCT) to provide reference data for implant treatment. METHODS: From the CBCT image database, 150 cases of radiographic data were selected according to the inclusion criteria and then were divided into six groups: males' mandibular central incisors, males' mandibular lateral incisors, males' mandibular canines, females' mandibular central incisors, females' mandibular lateral incisors, and females' mandibular canines...
December 1, 2017: Hua Xi Kou Qiang Yi Xue za Zhi, Huaxi Kouqiang Yixue Zazhi, West China Journal of Stomatology
https://www.readbyqxmd.com/read/29333369/assessment-of-the-anterior-loop-of-the-inferior-alveolar-nerve-via-cone-beam-computed-tomography
#8
Baratollah Shaban, Amin Khajavi, Nasim Khaki, Yones Mohiti, Tahere Mehri, Hamed Kermani
Objectives: The aim of this study was to evaluate different anatomical variants of the anterior loop of the inferior alveolar nerve (IAN) via cone-beam computed tomography (CBCT). Materials and Methods: CBCT images of 71 patients (36 males and 35 females) were evaluated. We used the classification described by Solar for IAN evaluation. In this classification, three different types of IAN loops were introduced prior to emerging from the mental foramen. We classified patients according to this system and introduced a new, fourth type...
December 2017: Journal of the Korean Association of Oral and Maxillofacial Surgeons
https://www.readbyqxmd.com/read/29333323/alveolar-ridge-preservation-with-an-open-healing-approach-using-single-layer-or-double-layer-coverage-with-collagen-membranes
#9
Ho-Keun Choi, Hag-Yeon Cho, Sung-Jo Lee, In-Woo Cho, Hyun-Seung Shin, Ki-Tae Koo, Hyun-Chang Lim, Jung-Chul Park
Purpose: The aim of this prospective pilot study was to compare alveolar ridge preservation (ARP) procedures with open-healing approach using a single-layer and a double-layer coverage with collagen membranes using radiographic and clinical analyses. Methods: Eleven molars from 9 healthy patients requiring extraction of the maxillary or mandibular posterior teeth were included and allocated into 2 groups. After tooth extraction, deproteinized bovine bone mineral mixed with 10% collagen was grafted into the socket and covered either with a double-layer of resorbable non-cross-linked collagen membranes (DL group, n=6) or with a single-layer (SL group, n=5)...
December 2017: Journal of Periodontal & Implant Science
https://www.readbyqxmd.com/read/29333322/a-randomized-controlled-clinical-study-of-periodontal-tissue-regeneration-using-an-extracellular-matrix-based-resorbable-membrane-in-combination-with-a-collagenated-bovine-bone-graft-in-intrabony-defects
#10
Sulhee Kim, Hyeyoon Chang, Jin Wook Hwang, Sungtae Kim, Ki-Tae Koo, Tae-Il Kim, Yang-Jo Seol, Yong-Moo Lee, Young Ku, Jong-Ho Lee, In-Chul Rhyu
Purpose: The purpose of this study was to investigate the feasibility of regenerative therapy with a collagenated bone graft and resorbable membrane in intrabony defects, and to evaluate the effects of the novel extracellular matrix (ECM)-based membrane clinically and radiologically. Methods: Periodontal tissue regeneration procedure was performed using an ECM-based resorbable membrane in combination with a collagenated bovine bone graft in intrabony defects around the teeth and implants...
December 2017: Journal of Periodontal & Implant Science
https://www.readbyqxmd.com/read/29332447/a-projection-quality-driven-tube-current-modulation-method-in-cone-beam-ct-for-igrt-proof-of-concept
#11
Kuo Men, Jianrong Dai
PURPOSE: To develop a projection quality-driven tube current modulation method in cone-beam computed tomography for image-guided radiotherapy based on the prior attenuation information obtained by the planning computed tomography and then evaluate its effect on a reduction in the imaging dose. MATERIALS AND METHODS: The QCKV-1 phantom with different thicknesses (0-400 mm) of solid water upon it was used to simulate different attenuation (μ). Projections were acquired with a series of tube current-exposure time product (mAs) settings, and a 2-dimensional contrast to noise ratio was analyzed for each projection to create a lookup table of mAs versus 2-dimensional contrast to noise ratio, μ...
December 2017: Technology in Cancer Research & Treatment
https://www.readbyqxmd.com/read/29329996/to-prep-or-not-to-prep-that-is-the-question-a-randomized-trial-on-the-use-of-antiflatulent-medication-as-part-of-bowel-preparation-for-patients-having-image-guided-external-beam-radiation-therapy-to-the-prostate
#12
Merrylee McGuffin, Naila Devji, Lyann Kehoe, Anne Carty, Steve Russell, Lisa Di Prospero, Carlo DeAngelis, Alex Kiss, Danny Vesprini, Andrew Loblaw, Laura D'Alimonte
INTRODUCTION: Radiation therapy is a standard treatment option for prostate cancer. With growing use of escalated doses and tighter margins, procedures to limit rectal size variation are needed to reduce prostate motion, increase treatment accuracy, and minimize rectal toxicity. This prospective study was done to determine whether the introduction of an antiflatulent medication would decrease rectal distention at computed tomography (CT) simulation and throughout a course of radiation therapy...
November 4, 2017: Practical Radiation Oncology
https://www.readbyqxmd.com/read/29328048/a-biomechanical-modeling-guided-simultaneous-motion-estimation-and-image-reconstruction-technique-smeir-bio-for-4d-cbct-reconstruction
#13
Xiaokun Huang, You Zhang, Jing Wang
Reconstructing four-dimensional cone-beam computed tomography (4D-CBCT) images directly from respiratory phase-sorted traditional 3D-CBCT projections can capture target motion trajectory, reduce motion artifacts, and reduce imaging dose and time. However, the limited numbers of projections in each phase after phase-sorting decreases CBCT image quality under traditional reconstruction techniques. To address this problem, we developed a simultaneous motion estimation and image reconstruction (SMEIR) algorithm, an iterative method that can reconstruct higher quality 4D-CBCT images from limited projections using an inter-phase intensity-driven motion model...
January 12, 2018: Physics in Medicine and Biology
https://www.readbyqxmd.com/read/29325874/perceptual-changes-with-monopolar-and-phantom-electrode-stimulation
#14
Silke Klawitter, David M Landsberger, Andreas Büchner, Waldo Nogueira
Phantom electrode (PE) stimulation is achieved by simultaneously stimulating out-of-phase from two adjacent intra-cochlear electrodes with different amplitudes. If the basal electrode stimulates with a smaller amplitude than the apical electrode of the pair, the resulting electrical field is pushed away from the basal electrode producing a lower pitch. There is great interest in using PE stimulation in a processing strategy as it can be used to provide stimulation to regions of the cochlea located more apically than the most apical contact on the electrode array...
December 28, 2017: Hearing Research
https://www.readbyqxmd.com/read/29322857/morphometric-analysis-for-evaluating-the-relation-between-incisal-guidance-angle-occlusal-plane-angle-and-functional-temporomandibular-joint-shape-variation
#15
Seulgi Han, Sang Min Shin, Yong-Seok Choi, So Yeun Kim, Ching-Chang Ko, Yong-Il Kim
OBJECTIVE: The correlations between morphology of the temporomandibular joint structure, the anterior guidance angle, and occlusal plane were investigated. MATERIALS AND METHODS: A cone beam computed tomography analysis was performed in 158 patients (86 women and 72 men). 3D software was employed to obtain the coordinates of the shape of the incisal guidance angle, occlusal guidance angle, articular fossa, and mandibular condyle. Generalized Procrustes analysis including principal components analysis (PCA) were performed and produced principal components (PCs) scores of each shape and their centroid size (CS)...
January 11, 2018: Acta Odontologica Scandinavica
https://www.readbyqxmd.com/read/29321613/evaluation-of-in-vivo-digital-root-reconstruction-based-on-anatomical-characteristics-of-the-periodontal-ligament-using-cone-beam-computed-tomography
#16
Chenxin Wang, Yi Liu, Siwei Wang, Yong Wang, Yijiao Zhao
This study's aim was to develop and validate an approach to automatically extract and reconstruct three-dimensional (3D) digital root models from in vivo teeth based on the anatomical characteristics of the periodontal ligament using cone beam computed tomography (CBCT) data. Prior to undergoing dental extractions for orthodontic purposes, the CBCT data of each study participant were collected and imported into Mimics software to reconstruct 3D in vivo digital root models (test models). Twenty roots of 17 teeth extracted from the study's participants were scanned using a dental scanner to obtain 3D in vitro digital root models (reference models)...
January 10, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29320570/image-guided-whole-pelvic-intensity-modulated-radiotherapy-for-biochemical-recurrence-following-radical-prostatectomy-in-high-risk-prostate-cancer-patients
#17
Sang Jun Byun, Young Seok Kim, Hanjong Ahn, Choung-Soo Kim
BACKGROUND: The optimal field size of salvage radiotherapy (SRT) for biochemical recurrence, particularly for patients with high-risk prostate cancer, remains undefined. This retrospective analysis was performed to investigate oncological outcomes as well as treatment-related toxicity following salvage intensity-modulated radiotherapy (IMRT) to the whole pelvis and to compare the results with other studies implementing a small field size of the prostate bed. METHODS: The medical records of 170 patients with high-risk prostate cancer who received SRT for biochemical recurrence following prostatectomy were reviewed...
2018: PloS One
https://www.readbyqxmd.com/read/29318928/cone-beam-computed-tomography-a-new-low-dose-three-dimensional-imaging-technique-for-assessment-of-bone-erosions-in-rheumatoid-arthritis-reliability-assessment-and-comparison-with-conventional-radiography-a-barfot-study
#18
Y Aurell, Mle Andersson, K Forslind
OBJECTIVES: To determine the intra- and inter-observer agreement of erosions detected and scored with cone-beam computed tomography (CBCT) of bones in the hands and feet, and to compare CBCT with conventional radiography (CR) for assessment of bone erosions in patients with long-standing rheumatoid arthritis (RA). METHOD: Thirty patients with long-standing RA from the Better Anti-Rheumatic PharmacOTherapy (BARFOT) cohort were examined with CBCT and CR of hands and feet at their 15 year follow-up...
January 10, 2018: Scandinavian Journal of Rheumatology
https://www.readbyqxmd.com/read/29318364/five-mental-foramina-in-the-same-mandible-cbct-findings-of-an-unusual-anatomical-variant
#19
Andrea Borghesi, Stefania Pezzotti, Giorgio Nocivelli, Roberto Maroldi
The mental foramen is an important anatomic landmark located on the buccal aspect of the mandible, typically near the apex of the second premolar. Mental foramina exhibit many anatomical variations, including differences in size, shape, position, and number. The most frequent type of variation in number is the presence of double mental foramen, which has a reported incidence ranging from 1.4 to 12.5%. The incidence of triple mental foramen ranges from 0.7 to 1.2%. The frequency of accessory mental foramina varies among ethnic groups, with a low incidence in white Caucasian populations...
January 9, 2018: Surgical and Radiologic Anatomy: SRA
https://www.readbyqxmd.com/read/29317032/newer-technologies-in-breast-cancer-imaging-dedicated-cone-beam-breast-computed-tomography
#20
Avice M O'Connell, Andrew Karellas, Srinivasan Vedantham, Daniel T Kawakyu-O'Connor
Dedicated breast computed tomography (CT) is the latest in a long history of breast imaging techniques dating back to the 1960s. Breast imaging is performed both for cancer screening as well as for diagnostic evaluation of symptomatic patients. Dedicated breast CT received US Food and Drug Administration approval for diagnostic use in 2015 and is slowly gaining recognition for its value in diagnostic 3-dimensional imaging of the breast, and also for injected contrast-enhanced imaging applications. Conventional mammography has known limitations in sensitivity and specificity, especially in dense breasts...
February 2018: Seminars in Ultrasound, CT, and MR
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