keyword
MENU ▼
Read by QxMD icon Read
search

Cone beam CT

keyword
https://www.readbyqxmd.com/read/28731499/the-frontal-sinus-cavity-exhibits-sexual-dimorphism-in-3d-cone-beam-ct-images-and-can-be-used-for-sex-determination
#1
Isabela G G Choi, Eduardo F Duailibi-Neto, Thiago L Beaini, Renan L B da Silva, Israel Chilvarquer
Few studies have assessed the use of the frontal sinus cavities for sex differentiation. In this study, a new methodology was used to assess the reliability of CBCT images of the frontal sinus cavity for determining sex based on the sexual dimorphism found in this anatomical structure. The survey sample consisted of 130 scans that were reconstructed three-dimensionally. 3D images of the cavity volume in the frontal, lateral, and basal views were exported in TIFF. The following variables were measured in a second program: area, perimeter, bounding rectangle, ellipse fit, circularity, aspect ratio, roundness, solidity, and Feret's diameter...
July 21, 2017: Journal of Forensic Sciences
https://www.readbyqxmd.com/read/28726684/low-dose-4d-cone-beam-ct-via-joint-spatiotemporal-regularization-of-tensor-framelet-and-nonlocal-total-variation
#2
Hao Han, Hao Gao, Lei Xing
Excessive radiation exposure is still a major concern in 4D cone-beam computed tomography (4D-CBCT) due to its prolonged scanning duration. Radiation dose can be effectively reduced by either under-sampling the x-ray projections or reducing the x-ray flux. However, 4D-CBCT reconstruction under such low-dose protocols is prone to image artifacts and noise. In this work, we propose a novel joint regularization-based iterative reconstruction method for low-dose 4D-CBCT. To tackle the under-sampling problem, we employ spatiotemporal tensor framelet (STF) regularization to take advantage of the spatiotemporal coherence of the patient anatomy in 4D images...
July 20, 2017: Physics in Medicine and Biology
https://www.readbyqxmd.com/read/28726056/interobserver-variability-of-patient-positioning-using-four-different-ct-datasets-for-image-registration-in-lung-stereotactic-body-radiotherapy
#3
Markus Oechsner, Barbara Chizzali, Michal Devecka, Stefan Münch, Stephanie Elisabeth Combs, Jan Jakob Wilkens, Marciana Nona Duma
PURPOSE: To assess the impact of different reference CT datasets on manual image registration with free-breathing three-dimensional (3D) cone beam CTs (FB-CBCT) for patient positioning by several observers. METHODS: For 48 patients with lung lesions, manual image registration with FB-CBCTs was performed by four observers. A slow planning CT (PCT), average intensity projection (AIP), maximum intensity projection (MIP), and midventilation CT (MidV) were used as reference images...
July 19, 2017: Strahlentherapie und Onkologie: Organ der Deutschen Röntgengesellschaft ... [et Al]
https://www.readbyqxmd.com/read/28714458/a-graphical-approach-to-optimizing-variable-kernel-smoothing-parameters-for-improved-deformable-registration-of-ct-and-cone-beam-ct-images
#4
Vern Hart, Damon Burrow, X Allen Li
A systematic method is presented for determining optimal parameters in variable-kernel deformable image registration of cone beam CT and CT images, in order to improve accuracy and convergence for potential use in online adaptive radiotherapy. Assessed conditions included the noise constant (symmetric force demons), the kernel reduction rate, the kernel reduction percentage, and the kernel adjustment criteria. Four such parameters were tested in conjunction with reductions of 5, 10, 15, 20, 30, and 40%. Noise constants ranged from 1...
July 17, 2017: Physics in Medicine and Biology
https://www.readbyqxmd.com/read/28713511/accuracy-of-densitometry-of-two-cone-beam-computed-tomography-equipment-in-comparison-with-computed-tomography
#5
Sina Haghanifar, Sajad Yousefi, Ehsan Moudi, Farida Abesi, Ali Bijani, Ali Akbar Moghadamnia, Mehrdad Nabahati
BACKGROUND: The use of oral implants has been growing, and cone beam computerized tomography (CBCT) has become the method of choice for oral and maxillofacial radiology. OBJECTIVE: To assess the accuracy of bone densitometry in two different CBCT devices in comparison with MDCT (multi-detector CT). METHODS: Different concentrations of urografin, including 2.5%, 5%, 7.5%, 10%, 12.5%, were prepared, and the Hounsfield unit of these solution was measured by two CBCT devices (SORDEX CRANEX 3D and NEWTOM 5G) and one spiral CT device (SOMATOM SENSATION)...
May 2017: Electronic Physician
https://www.readbyqxmd.com/read/28711896/computer-tomographic-characteristics-of-root-length-incisors-and-canines-of-the-upper-and-lower-jaws-in-boys-and-girls-with-different-craniotypes-and-physiological-bite
#6
Аlla V Маrchenko, Іgor V Gunas, Tetyana O Petrushanko, Oksana А Serebrennikova, Yulia Yu Trofimenko
INTRODUCTION: In recent years, in world literature appeared research, which focuses on the study of relationships craniotypes with odonto-metric indicators, size, shape of the dental arches and occlusion. However, most of the experts focus on the study of individual features of the structure of the teeth-jaw system in people with different types of faces and aspects of sexual dimorphism and ethnic characteristics. Studies containing information about cranio-typological variability of the roots of teeth we did not encounter...
2017: Wiadomości Lekarskie: Organ Polskiego Towarzystwa Lekarskiego
https://www.readbyqxmd.com/read/28710583/prototype-metal-artefact-reduction-algorithm-in-flat-panel-computed-tomography-evaluation-in-patients-undergoing-transarterial-hepatic-radioembolisation
#7
Qeumars Mustafa Hamie, Adrian Raoul Kobe, Leif Mietzsch, Michael Manhart, Gilbert Dominique Puippe, Thomas Pfammatter, Roman Guggenberger
OBJECTIVE: To investigate the effect of an on-site prototype metal artefact reduction (MAR) algorithm in cone-beam CT-catheter-arteriography (CBCT-CA) in patients undergoing transarterial radioembolisation (RE) of hepatic masses. METHODS AND MATERIALS: Ethical board approved retrospective study of 29 patients (mean 63.7±13.7 years, 11 female), including 16 patients with arterial metallic coils, undergoing CBCT-CA (8s scan, 200 degrees rotation, 397 projections)...
July 14, 2017: European Radiology
https://www.readbyqxmd.com/read/28708129/validation-of-a-novel-imaging-approach-using-multi-slice-ct-and-cone-beam-ct-to-follow-up-on-condylar-remodeling-after-bimaxillary-surgery
#8
Laura Ferreira Pinheiro Nicolielo, Jeroen Van Dessel, Eman Shaheen, Carolina Letelier, Marina Codari, Constantinus Politis, Ivo Lambrichts, Reinhilde Jacobs
The main goal of this study was to introduce a novel three-dimensional procedure to objectively quantify both inner and outer condylar remodelling on preoperative multi-slice computed tomography (MSCT) and postoperative cone-beam computed tomography (CBCT) images. Second, the reliability and accuracy of this condylar volume quantification method was assessed. The mandibles of 20 patients (11 female and 9 male) who underwent bimaxillary surgery were semi-automatically extracted from MSCT/CBCT scans and rendered in 3D...
July 14, 2017: International Journal of Oral Science
https://www.readbyqxmd.com/read/28707526/diagnostic-validity-of-periapical-radiography-and-cbct-for-assessing-periapical-lesions-that-persist-after-endodontic-surgery
#9
Casper Kruse, Rubens Spin-Neto, Jesper Reibel, Ann Wenzel, Lise-Lotte Kirkevang
OBJECTIVES: Traditionally, healing after surgical endodontic retreatment (SER); i.e. apicectomy with or without a retrograde filling, is assessed in periapical radiographs (PR). Recently, the use of Cone Beam CT (CBCT) has increased within endodontics. Generally, CBCT detects more periapical lesions than PR, but basic research on the true nature of these lesions is missing. The objective was to assess the diagnostic validity of PR and CBCT for determining inflammation in SER-cases that were re-operated (SER-R) due to unsuccessful healing, using histology of the periapical lesion as reference for inflammation...
July 14, 2017: Dento Maxillo Facial Radiology
https://www.readbyqxmd.com/read/28705329/relationship-between-cone-beam-ct-technique-and-diagnostic-usefulness-in-patients-undergoing-embolotherapy-for-hepatocellular-carcinoma
#10
D Gutierrez, R Kishore Gurajala, B Kapoor, R Setser, K Karuppasamy
AIM: To determine the effect of different numbers of projection images in C-arm cone-beam computed tomography (CBCT) on diagnostic content and image quality in patients undergoing angiographic embolotherapy for hepatocellular carcinoma (HCC). MATERIALS AND METHODS: A total of 29 patients who underwent contrast-enhanced conventional multidetector CT (MDCT) within 6 weeks prior to CBCT acquired during embolotherapy for HCC between 2010 and 2013 were included in the study...
July 10, 2017: Clinical Radiology
https://www.readbyqxmd.com/read/28699418/evaluation-of-deformable-image-registration-based-contour-propagation-from-planning-ct-to-cone-beam-ct
#11
Andrew J Woerner, Mehee Choi, Matthew M Harkenrider, John C Roeske, Murat Surucu
PURPOSE: We evaluated the performance of organ contour propagation from a planning computed tomography to cone-beam computed tomography with deformable image registration by comparing contours to manual contouring. MATERIALS AND METHODS: Sixteen patients were retrospectively identified based on showing considerable physical change throughout the course of treatment. Multiple organs in the 3 regions (head and neck, prostate, and pancreas) were evaluated. A cone-beam computed tomography from the end of treatment was registered to the planning computed tomography using rigid registration, followed by deformable image registration...
January 1, 2017: Technology in Cancer Research & Treatment
https://www.readbyqxmd.com/read/28687756/john-s-equation-based-consistency-condition-and-corrupted-projection-restoration-in-circular-trajectory-cone-beam-ct
#12
Jianhui Ma, Shuyu Wu, Hongliang Qi, Bin Li, Hao Yan, Linghong Zhou, Yuan Xu
In transmitted X-ray tomography imaging, the acquired projections may be corrupted for various reasons, such as defective detector cells and beam-stop array scatter correction problems. In this study, we derive a consistency condition for cone-beam projections and propose a method to restore lost data in corrupted projections. In particular, the relationship of the geometry parameters in circular trajectory cone-beam computed tomography (CBCT) is utilized to convert an ultra-hyperbolic partial differential equation (PDE) into a second-order PDE...
July 7, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28678971/differential-diagnosis-and-clinical-management-of-periapical-radiopaque-hyperdense-jaw-lesions
#13
Brunno Santos Freitas Silva, Mike Reis Bueno, Fernanda P Yamamoto-Silva, Ricardo Santiago Gomez, Ove Andreas Peters, Carlos Estrela
Great attention has been given to the study of radiolucent periapical lesions to avert possible misdiagnosis of apical periodontitis associated with certain radiolucent non-endodontic lesions. However, there are a significant number of radiopaque lesions found in the periapical region, which could be equally relevant to endodontic practice. The diagnosis and management of these radiopaque/hyperdense lesions could be challenging to the endodontist. These bone alterations could be neoplastic, dysplastic or of metabolic origin...
July 3, 2017: Brazilian Oral Research
https://www.readbyqxmd.com/read/28677053/the-role-of-cone-beam-breast-ct-for-breast-cancer-detection-relative-to-breast-density
#14
Susanne Wienbeck, Johannes Uhlig, Susanne Luftner-Nagel, Antonia Zapf, Alexey Surov, Eva von Fintel, Vera Stahnke, Joachim Lotz, Uwe Fischer
OBJECTIVES: To evaluate the impact of breast density on the diagnostic accuracy of non-contrast cone-beam breast computed tomography (CBBCT) in comparison to mammography for the detection of breast masses. METHODS: A retrospective study was conducted from August 2015 to July 2016. Fifty-nine patients (65 breasts, 112 lesions) with BI-RADS, 5th edition 4 or 5 assessment in mammography and/or ultrasound of the breast received an additional non-contrast CBBCT. Independent double blind reading by two radiologists was performed for mammography and CBBCT imaging...
July 4, 2017: European Radiology
https://www.readbyqxmd.com/read/28676860/combining-acceleration-techniques-for-low-dose-x-ray-cone-beam-computed-tomography-image-reconstruction
#15
Hsuan-Ming Huang, Ing-Tsung Hsiao
BACKGROUND AND OBJECTIVE: Over the past decade, image quality in low-dose computed tomography has been greatly improved by various compressive sensing- (CS-) based reconstruction methods. However, these methods have some disadvantages including high computational cost and slow convergence rate. Many different speed-up techniques for CS-based reconstruction algorithms have been developed. The purpose of this paper is to propose a fast reconstruction framework that combines a CS-based reconstruction algorithm with several speed-up techniques...
2017: BioMed Research International
https://www.readbyqxmd.com/read/28673491/assessment-of-volumetric-distortion-artifact-in-filled-root-canals-using-different-cone-beam-computed-tomographic-devices
#16
Berkan Celikten, Reinhilde Jacobs, Karla deFaria Vasconcelos, Yan Huang, Laura Ferreira Pinheiro Nicolielo, Kaan Orhan
INTRODUCTION: Artifacts in cone-beam computed tomographic (CBCT) imaging may compromise radiodiagnosis. Obturation materials for endodontic treatment may present with variable material density and thus also cause distinct artifact expression. The aim of this study was to assess the volume distortion artifact of root canal sealers using CBCT devices and micro-CT imaging as a reference. METHODS: Thirty single-root mandibular central incisors were used for this study...
June 30, 2017: Journal of Endodontics
https://www.readbyqxmd.com/read/28673490/accuracy-of-cone-beam-computed-tomography-in-measuring-dentin-thickness-and-its-potential-of-predicting-the-remaining-dentin-thickness-after-removing-fractured-instruments
#17
Jialei Xu, Jingzhi He, Qian Yang, Dingming Huang, Xuedong Zhou, Ove A Peters, Yuan Gao
INTRODUCTION: The purpose of this study was to evaluate the accuracy of cone-beam computed tomographic (CBCT) to measure dentin thickness and its potential of predicting the remaining dentin thickness after the removal of fractured instrument fragments. METHODS: Twenty-three human mandibular molars were selected, and 4-mm portions of #25/.06 taper K3 files (SybronEndo, Orange, CA) were fractured in mesial canals. The teeth were then scanned using a micro-computed tomographic (micro-CT) system and a CBCT unit...
June 30, 2017: Journal of Endodontics
https://www.readbyqxmd.com/read/28669444/long-term-influence-of-mandibular-advancement-on-the-volume-of-the-posterior-airway-in-skeletal-class-ii-patients-a-retrospective-analysis
#18
D Dalla Torre, D Burtscher, G Widmann, M Rasse, T Puelacher, W Puelacher
In the past, maxillomandibular advancement has resulted in considerable improvement in the volume of the posterior airway space. The objective of the present study was to find out how mandibular advancement without maxillary involvement would affect the posterior airway space in patients with mandibular retrognathism. Cone-beam computed tomographic (CT) scans were done for 20 patients before, and six months after, mandibular advancement. Cephalometric analysis at both time points included 2-dimensional and 3-dimensional assessment of the upper airway...
June 29, 2017: British Journal of Oral & Maxillofacial Surgery
https://www.readbyqxmd.com/read/28666904/actual-target-coverage-after-setup-verification-using-surgical-clips-compared-with-external-skin-markers-in-postoperative-breast-cancer-radiation-therapy
#19
Anke van der Salm, Lars Murrer, Inge Steenbakkers, Ruud Houben, Liesbeth J Boersma
PURPOSE: After changing from offline setup verification to online setup verification using external skin markers in breast cancer patients, we noticed an increase in localized acute skin toxicity beneath the markers. Also, in vivo 3-dimensional dose measurements showed deviations between the delivered and the planned dose distributions; therefore, we investigated the accuracy of setup verification using surgical clips in the tumor bed, with a focus on target coverage of whole breast and tumor bed...
April 19, 2017: Practical Radiation Oncology
https://www.readbyqxmd.com/read/28666498/stafne-bone-cavity-complicated-by-periapical-infection
#20
Fethi Atil, Mehmet Zahit Adisen, Melda Misirlioglu, Berkay Tolga Suer
Stafne bone cavity (SBC) is an uncommon lesion of the mandible; and generally found incidentally on routine radiographic examinations. The radiographic differential diagnosis of SBC includes a variety of lesions including odontogenic cysts, benign tumors, or bone metastases. In the present case, a 22-year female patient was admitted with chief complaint of pain in the right mandibular molar area. On panoramic radiographic examination, a non-specific large radiolucent lesion related to mandibular molar teeth was detected and extra-oral surgical intervention was planned...
November 2016: Journal of the College of Physicians and Surgeons—Pakistan: JCPSP
keyword
keyword
664
1
2
Fetch more papers »
Fetching more papers... Fetching...
Read by QxMD. Sign in or create an account to discover new knowledge that matter to you.
Remove bar
Read by QxMD icon Read
×

Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"