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Cone beam CT

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https://www.readbyqxmd.com/read/28212456/influence-of-posterior-mandibular-dimensions-on-alveolar-bone-microarchitecture
#1
Alberto Monje, Yiqun Wu, Wei Huang, Wenjie Zhou, Pablo Galindo-Moreno, Jesus Montanero-Fernandez, Rachel A Sheridan, Hom-Lay Wang, Feng Wang
PURPOSE: The aim of this study was to investigate the influence of posterior mandibular dimensions (height and width at various levels) on alveolar bone microarchitecture using microcomputed tomography (micro-CT). MATERIALS AND METHODS: Partially edentulous subjects with one missing molar were included in the study. A bone core biopsy was performed at the site of planned implant surgery. For each patient, alveolar morphologic and architectural characteristics were analyzed using cone beam computed tomography (CBCT) and micro-CT imaging...
February 17, 2017: International Journal of Oral & Maxillofacial Implants
https://www.readbyqxmd.com/read/28211367/high-quality-four-dimensional-cone-beam-ct-reconstruction-using-motion-compensated-total-variation-regularization
#2
Hua Zhang, Jianhua Ma, Zhaoying Bian, Dong Zeng, Qianjin Feng, Wufan Chen
Four dimensional cone-beam computed tomography (4D-CBCT) has great potential clinical value because its ability to describe tumor and organ motion. But the challenge in 4D-CBCT reconstruction is the limited number of projections at each phase, which resulting in the reconstruction full of noise and streak artifacts with the conventional analytical algorithms. To address this problem, in this paper, we propose a motion compensated total variation regularization approach which tries to maximum explore the temporal coherence of the spatial structures among 4D-CBCT phases...
February 17, 2017: Physics in Medicine and Biology
https://www.readbyqxmd.com/read/28210446/differences-between-panoramic-and-cone-beam-ct-in-the-surgical-evaluation-of-lower-third-molars
#3
Ruggero Rodriguez Y Baena, Riccardo Beltrami, Angelo Tagliabo, Silvana Rizzo, Saturnino-Marco Lupi
BACKGROUND: The aim of this study was to evaluate the ability to identify the contiguity between the root of the mandibular third molar and the mandibular canal (MC) in panoramic radiographs compared with Cone Beam-CT. MATERIAL AND METHODS: Panoramic radiographs of 326 third molars and CBCT radiographs of 86 cases indicated for surgery and considered at risk were evaluated. The following signs were assessed in panoramic radiographs as risk factors: radiolucent band, loss of MC border, change in MC direction, MC narrowing, root narrowing, root deviation, bifid apex, superimposition, and contact between the root third molar and the MC...
February 2017: Journal of Clinical and Experimental Dentistry
https://www.readbyqxmd.com/read/28206730/sinus-presurgical-evaluation-a-literature-review-and-a-new-classification-proposal
#4
Lorenzo Tavelli, Andrea E Borgonovo, Dino Re, Carlo Maiorana
Presurgical evaluation with cone beam computed tomography (CBCT) or computed tomography (CT) has become an essential tool for diagnosis and surgical planning, including maxillary sinus floor elevation. Before performing a sinus lift, the clinician's attention should not be only directed to the patency of the ostium through CBCT or CT, because many anatomical features could influence the surgical approach of sinus floor elevation. The goal of this article was to facilitate the communication between clinicians regarding the type of maxillary sinus, encourage in-depth analysis prior to surgery and reduce the risk of complications due to possible underestimation of important parameters...
February 15, 2017: Minerva Stomatologica
https://www.readbyqxmd.com/read/28206667/geometry-calibration-method-for-a-cone-beam-ct-system
#5
Hongkai Yang, Kejun Kang, Yuxiang Xing
PURPOSE: The positioning accuracy of each component is important to ensure the image quality of cone-beam CT. However, accurate positioning is not easy and requires experience and time. The option is to calibrate the geometric parameters and then plug them into a reconstruction algorithm which is the preferred solution in practice. In this case, the image quality is determined by the accuracy and precision of the calibration method. This work describes a method to independently calibrate an imaging system in each pose (projection angle) for a cone-beam CT with a non-ideal-circular trajectory...
February 16, 2017: Medical Physics
https://www.readbyqxmd.com/read/28203008/-effects-of-different-techniques-on-removal-of-vapor-lock-in-the-apical-region-of-curved-canals-a-cone-beam-computed-tomography-study
#6
Z Su, Y H Bai, X M Hou
OBJECTIVE: To compare the effect of four different techniques on removal of vapor lock in the apical region of curved root canals. METHODS: Forty simulated resin root canals with 45° curvature were prepared using WaveOne Primary, then the apical foramen were sealed with soft wax. The teeth were divided randomly into 4 groups thereafter (n=10). Contract solution was injected into the canals using a 30 G side-vented needle and scanned with cone-beam CT (CBCT) to identify the volume of the vapor lock...
February 18, 2017: Beijing da Xue Xue Bao. Yi Xue Ban, Journal of Peking University. Health Sciences
https://www.readbyqxmd.com/read/28199139/feasibility-of-vacuum-assisted-breast-cone-beam-ct-guided-biopsy-and-comparison-with-prone-stereotactic-biopsy
#7
Susanne Wienbeck, Joachim Lotz, Uwe Fischer
OBJECTIVE: The feasibility of breast vacuum-assisted biopsy (VAB) guided by cone-beam CT (CBCT) was assessed. The initial clinical performance of CT-guided breast VAB was compared with that of established prone stereotactic VAB. MATERIALS AND METHODS: In this retrospective clinical trial, VABs were performed for women with mammographically suspicious breast lesions using a dedicated breast CBCT protocol. The technical success rate, total intervention time, and complications were documented and compared with examinations performed by prone stereotactic VAB...
February 15, 2017: AJR. American Journal of Roentgenology
https://www.readbyqxmd.com/read/28194401/clinical-application-of-cone-beam-computed-tomography-of-the-rabbit-head-part-2-dental-disease
#8
G G Riggs, Derek D Cissell, Boaz Arzi, David C Hatcher, Philip H Kass, Amy Zhen, Frank J M Verstraete
Domestic rabbits are increasing in popularity as household pets; therefore, veterinarians need to be familiar with the most common diseases afflicting rabbits including dental disease. Current diagnostic approaches include gross oral examination, endoscopic oral examination, skull radiography, and computed tomography (CT). Cone beam computed tomography (CBCT), a new oral and maxillofacial imaging modality that has the capability to produce high-resolution images, has not yet been described for use in evaluating dental disease in rabbits...
2017: Frontiers in Veterinary Science
https://www.readbyqxmd.com/read/28192871/sinus-septi-nasi-anatomical-study
#9
Ranko Mladina, Romano Antunović, Cemal Cingi, Nuray Bayar Muluk, Neven Skitarelić
OBJECTIVES: The aim of this study was to perform a pioneering investigation into the incidence of pneumatization in human skulls. METHODS: A total of 93 human skulls (≥20 years of age, 69 males, 24 females) were included in the study. The skulls were scanned in a fixed position using cone beam computed tomography (CBCT). The pneumatized space parameters within the nasal septum - width, length, and height - were measured. RESULTS: Two types of finding were identified: (a) Pneumatization, named "sinus septi nasi" (SSN), and (b) "spongy bone" (SB)...
February 13, 2017: Clinical Anatomy
https://www.readbyqxmd.com/read/28192614/cone-beam-ct-based-adaptive-planning-improves-permanent-prostate-brachytherapy-dosimetry-an-analysis-of-1266-patients
#10
Hendrik Westendorp, Carel J Hoekstra, Jos J Immerzeel, Sandrine M G van de Pol, Charles G H J Niël, Robert A J Kattevilder, Tonnis T Nuver, André W Minken, Marinus A Moerland
PURPOSE: To evaluate adaptive planning for permanent prostate brachytherapy and to identify the prostate regions that needed adaptation. METHODS AND MATERIALS: After the implantation of stranded seeds, using real-time intraoperative planning, a transrectal ultrasound (TRUS)-scan was obtained and contoured. The positions of seeds were determined on a C-arm cone-beam Computed Tomography (CBCT)-scan. The CBCT-scan was registered to the TRUS-scan using fiducial gold markers...
February 13, 2017: Medical Physics
https://www.readbyqxmd.com/read/28190601/clinical-implementation-of-coverage-probability-planning-for-nodal-boosting-in-locally-advanced-cervical-cancer
#11
Anne Ramlov, Marianne S Assenholt, Maria F Jensen, Caroline Grønborg, Remi Nout, Markus Alber, Lars Fokdal, Kari Tanderup, Jacob Chr Lindegaard
PURPOSE: To implement coverage probability (CovP) for dose planning of simultaneous integrated boost (SIB) of pathologic lymph nodes in locally advanced cervical cancer (LACC). MATERIAL AND METHODS: CovP constraints for SIB of the pathological nodal target (PTV-N) with a central dose peak and a relaxed coverage at the perimeter were generated for use with the treatment planning system Eclipse: PTV-N D98 >90%, CTV-N D98 >100% and CTV-N D50 >101.5% of prescribed dose...
February 9, 2017: Radiotherapy and Oncology: Journal of the European Society for Therapeutic Radiology and Oncology
https://www.readbyqxmd.com/read/28188426/non-specific-benign-pathological-results-on-transthoracic-core-needle-biopsy-how-to-differentiate-false-negatives
#12
Jung Im Kim, Chang Min Park, Hyungjin Kim, Jong Hyuk Lee, Jin Mo Goo
OBJECTIVES: To determine the negative predictive value (NPV) of non-specific benign results from cone-beam CT (CBCT)-guided transthoracic core-needle biopsy (TTNB) and identify predicting factors for false-negative for malignancies. METHODS: From January 2009-December 2011, 1,108 consecutive patients with 1,116 lung lesions underwent CBCT-guided TTNB using an 18-gauge coaxial cutting needle. Among them, 226 patients with 226 TTNBs, initially diagnosed as non-specific benign, were included in this study...
February 10, 2017: European Radiology
https://www.readbyqxmd.com/read/28187891/automated-classification-of-maxillofacial-cysts-in-cone-beam-ct-images-using-contourlet-transformation-and-spherical-harmonics
#13
Fatemeh Abdolali, Reza Aghaeizadeh Zoroofi, Yoshito Otake, Yoshinobu Sato
BACKGROUND AND OBJECTIVE: Accurate detection of maxillofacial cysts is an essential step for diagnosis, monitoring and planning therapeutic intervention. Cysts can be of various sizes and shapes and existing detection methods lead to poor results. Customizing automatic detection systems to gain sufficient accuracy in clinical practice is highly challenging. For this purpose, integrating the engineering knowledge in efficient feature extraction is essential. METHODS: This paper presents a novel framework for maxillofacial cysts detection...
February 2017: Computer Methods and Programs in Biomedicine
https://www.readbyqxmd.com/read/28186847/cytogenetic-biomonitoring-in-individuals-exposed-to-cone-beam-ct%C3%AF-comparison-among-exfoliated-buccal-mucosa-cells%C3%AF-cells-of-tongue-and-epithelial-gingival-cells
#14
Pan Yang, Shuai Hao, Xu Gong, Gang Li
OBJECTIVES: To evaluate chromosomal damage and cytotoxicity in exfoliated buccal mucosa cells,cells of tongue and epithelial gingival cells from adults following cone beam CT scan, and to compare the sensitivity of the different exfoliated cells to a same dosage of ionizing radiation. METHODS: The study included 46 healthy participants (median age 27 years; age range 23-42 years) who had a cone beam CT scan. Exfoliated mucosa cells were collected immediately before the CBCT scan and 10 days after...
February 10, 2017: Dento Maxillo Facial Radiology
https://www.readbyqxmd.com/read/28181789/a-novel-image-processing-technique-for-three-dimensional-volumetric-analysis-of-severely-resorbed-alveolar-sockets-with-cone-beam-computed-tomography
#15
Valeria Manavella, Federica Romano, Federica Garrone, Mara Terzini, Cristina Bignardi, Mario Aimetti
BACKGROUND: The aim of this study was to present and validate a novel procedure for the quantitative volumetric assessment of extraction sockets that combines Cone-Beam Computed Tomography (CBCT) and image processing techniques. METHODS: The CBCT dataset of 9 severely resorbed extraction sockets was analyzed by means of two image processing software, Image J and Mimics, using manual and automated segmentation techniques. They were also applied on 5 mm spherical aluminum markers of known volume and on a polyvinyl chloride model of one alveolar socket scanned with Micro-CT to test the accuracy...
February 9, 2017: Minerva Stomatologica
https://www.readbyqxmd.com/read/28168813/the-impacts-of-mid-treatment-cbct-guided-patient-repositioning-on-target-coverage-during-lung-vmat
#16
Dominique Mathieu, Marie-Pierre Campeau, Stéphane Bedwani, David Roberge, Robert Doucet, Karim Zerouali, Houda Bahig, Toni Vu, Louise Lambert, Laura Masucci, Edith Filion
INTRODUCTION: The purpose of this study is quantify intrafraction motion (IFM) during lung volumetric-modulated arc therapy (VMAT) and evaluate the impact of mid-treatment cone beam computed tomography (CBCT)-guided patient repositioning on target coverage. METHOD: This analysis included lung tumours treated with VMAT to 50-60 Gy in 3-5 fractions. Treatment planning was based on four-dimensional CT scans from which internal tumour volumes (ITV) were derived. An isotropic 5 mm margin was added to obtain the final planning target volume (PTV)...
February 7, 2017: Journal of Medical Imaging and Radiation Oncology
https://www.readbyqxmd.com/read/28168617/an-anatomical-study-of-pneumatized-crista-galli
#17
Ranko Mladina, Romano Antunović, Cemal Cingi, Nuray Bayar Muluk, Neven Skitarelić, Mislav Malić
The literature data on the incidence of pneumatization of the crista galli based on patients' computed tomography (CT) scans ranges from 3 to 37.5%. This study investigated for the first time the incidence of crista galli pneumatization based on CT scans of human skulls. The study examined 102 randomly selected human skulls (≥20 years of age; 76 males, 26 females). Skulls were scanned in a fixed position using cone beam computed tomography (CBCT) with a field of view of 145 × 130 mm and an isotropic voxel size of 0...
February 6, 2017: Neurosurgical Review
https://www.readbyqxmd.com/read/28156208/image-guided-intrathecal-baclofen-pump-catheter-implantation-a-technical-note-and-case-series
#18
Shenandoah Robinson, Faith C Robertson, Hormuzdiyar H Dasenbrock, Cormac P O'Brien, Charles Berde, Horacio Padua
OBJECTIVE Medically refractory spasticity and dystonia are often alleviated with intrathecal baclofen (ITB) administration through an indwelling catheter inserted in the lumbar spine. In patients with cerebral palsy, however, there is a high incidence of concomitant neuromuscular scoliosis. ITB placement may be technically challenging in those who have severe spinal deformity or who have undergone prior instrumented thoracolumbar fusion. Although prior reports have described drilling through the lumbar fusion mass with a high-speed bur, as well as IT catheter implantation at the foramen magnum or cervical spine, these approaches have notable limitations...
February 3, 2017: Journal of Neurosurgery. Spine
https://www.readbyqxmd.com/read/28153124/juxta-apical-radiolucency-relation-to-the-mandibular-canal-and-cortical-plates-based-on-cone-beam-ct-imaging
#19
Eduarda Helena Leandro Nascimento, Anne Caroline Costa Oenning, Mariana Rocha Nadaes, Gláucia Maria Bovi Ambrosano, Francisco Haiter-Neto, Deborah Queiroz Freitas
OBJECTIVE: To evaluate the relation of juxta-apical radiolucency (JAR) to the mandibular canal and cortical plates on cone beam computed tomography images, as well as to assess whether the presence of JAR is related to the position of the mandibular canal. STUDY DESIGN: Forty-seven JAR cases were evaluated by cone beam computed tomography. JAR position and its relationship to the mandibular canal and cortical plates were investigated. The position of the mandibular canal was recorded and compared with a control group...
March 2017: Oral Surgery, Oral Medicine, Oral Pathology and Oral Radiology
https://www.readbyqxmd.com/read/28146088/a-ring-artifact-correction-method-validation-by-micro-ct-imaging-with-flat-panel-detectors-and-a-2d-photon-counting-detector
#20
Mohamed Elsayed Eldib, Mohamed Hegazy, Yang Ji Mun, Myung Hye Cho, Min Hyoung Cho, Soo Yeol Lee
We introduce an efficient ring artifact correction method for a cone-beam computed tomography (CT). In the first step, we correct the defective pixels whose values are close to zero or saturated in the projection domain. In the second step, we compute the mean value at each detector element along the view angle in the sinogram to obtain the one-dimensional (1D) mean vector, and we then compute the 1D correction vector by taking inverse of the mean vector. We multiply the correction vector with the sinogram row by row over all view angles...
January 30, 2017: Sensors
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