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https://www.readbyqxmd.com/read/28735791/detection-of-incomplete-root-fractures-in-endodontically-treated-teeth-using-different-high-resolution-cone-beam-computed-tomographic-imaging-protocols
#1
Victor Aquino Wanderley, Frederico Sampaio Neves, Monikelly Carmo Chagas Nascimento, Gabriela Queiroz Del Melo Monteiro, Natália Siqueira Lobo, Matheus Lima Oliveira, Joao Batista Sobrinho Nascimento Neto, Luciane Farias Araujo
INTRODUCTION: The purpose of this study was to compare different high-resolution cone-beam computed tomographic (CBCT) imaging protocols in the diagnosis of incomplete root fractures of endodontically treated teeth. METHODS: Twenty single-rooted human teeth were endodontically treated, and an incomplete root fracture was induced. The teeth were scanned with the CBCT unit PreXion 3D (Teracom, San Mateo, CA) operating at 2 different protocols: high resolution/standard (HI-STD) (19 seconds and 512 basis images) and high resolution/high density (HI-HI) (37 seconds and 1024 basis images)...
July 20, 2017: Journal of Endodontics
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/28710583/prototype-metal-artefact-reduction-algorithm-in-flat-panel-computed-tomography-evaluation-in-patients-undergoing-transarterial-hepatic-radioembolisation
#3
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/28705329/relationship-between-cone-beam-ct-technique-and-diagnostic-usefulness-in-patients-undergoing-embolotherapy-for-hepatocellular-carcinoma
#4
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/28697853/inhibition-of-ataxia-telangiectasia-related-3-atr-improves-therapeutic-index-in-preclinical-models-of-non-small-cell-lung-cancer-nsclc-radiotherapy
#5
Victoria Dunne, Mihaela Ghita, Donna M Small, Caroline B M Coffey, Sinead Weldon, Clifford C Taggart, Sarah O Osman, Conor K McGarry, Kevin M Prise, Gerard G Hanna, Karl T Butterworth
BACKGROUND AND PURPOSE: To evaluate the impact of ATR inhibition using AZD6738 in combination with radiotherapy on the response of non-small cell lung cancer (NSCLC) tumour models and a murine model of radiation induced fibrosis. MATERIALS AND METHODS: AZD6738 was evaluated as a monotherapy and in combination with radiation in vitro and in vivo using A549 and H460 NSCLC models. Radiation induced pulmonary fibrosis was evaluated by cone beam computed tomography (CBCT) and histological staining...
July 8, 2017: Radiotherapy and Oncology: Journal of the European Society for Therapeutic Radiology and Oncology
https://www.readbyqxmd.com/read/28643737/changes-in-pharyngeal-constrictor-volumes-during-head-and-neck-radiation-therapy-implications-for-dose-delivery
#6
Akila Kumarasiri, Chang Liu, Mona Kamal, Correen Fraser, Stephen Brown, Indrin J Chetty, Jinkoo Kim, Farzan Siddiqui
OBJECTIVE: The objective of this study was to evaluate the anatomical changes and associated dosimetric consequences to pharyngeal constrictor muscles (PCMs) that occur during head and neck (H and N) radiotherapy (RT). MATERIALS AND METHODS: A cohort of 13 oropharyngeal cancer patients with daily cone beam computed tomography (CBCT) was retrospectively studied. On every 5th CBCT image, PCM was manually delineated by a radiation oncologist. The anterior-posterior PCM thickness was measured at the midline level of C3 vertebral body...
April 2017: Journal of Cancer Research and Therapeutics
https://www.readbyqxmd.com/read/28613920/diagnosis-of-alveolar-and-root-fractures-in-macerated-canine-maxillae-a-comparison-between-two-different-cbct-protocols
#7
Solange Kobayashi-Velasco, Fernanda C S Salineiro, Ivan O Gialain, Marcelo G P Cavalcanti
OBJECTIVE: To compare two small field of view (FOV) cone-beam computed tomography (CBCT) protocols with different voxel sizes, and number of frames for the diagnosis of root and alveolar fractures in macerated canine maxillae. METHODS: Eighty incisor teeth from the canine species were inserted in eighty anterior alveolar sockets of twenty canine maxillae. An operator randomly divided each maxilla site (eighty sites in total) into four equal groups of 20 sites: 1 (sound tooth and non-fractured alveolar socket); 2 (sound tooth and fractured alveolar socket); 3 (fractured root and non-fractured alveolar socket); 4 (fractured root and fractured alveolar socket)...
June 14, 2017: Dento Maxillo Facial Radiology
https://www.readbyqxmd.com/read/28609790/analysis-of-patients-x-ray-exposure-in-146-percutaneous-radiologic-gastrostomies
#8
Tim Ole Petersen, Martin Reinhardt, Jochen Fuchs, Dieter Gosch, Alexey Surov, Patrick Stumpp, Thomas Kahn, Michael Moche
Purpose Analysis of patient´s X-ray exposure during percutaneous radiologic gastrostomies (PRG) in a larger population. Materials and Methods Data of primary successful PRG-procedures, performed between 2004 and 2015 in 146 patients, were analyzed regarding the exposition to X-ray. Dose-area-product (DAP), dose-length-product (DLP) respectively, and fluoroscopy time (FT) were correlated with the used x-ray systems (Flatpanel Detector (FD) vs. Image Itensifier (BV)) and the necessity for periprocedural placement of a nasogastric tube...
June 13, 2017: RöFo: Fortschritte Auf Dem Gebiete der Röntgenstrahlen und der Nuklearmedizin
https://www.readbyqxmd.com/read/28602688/quality-control-in-cone-beam-computed-tomography-cbct-efomp-estro-iaea-protocol-summary-report
#9
Hugo de Las Heras Gala, Alberto Torresin, Alexandru Dasu, Osvaldo Rampado, Harry Delis, Irene Hernández Girón, Chrysoula Theodorakou, Jonas Andersson, John Holroyd, Mats Nilsson, Sue Edyvean, Vesna Gershan, Lama Hadid-Beurrier, Christopher Hoog, Gregory Delpon, Ismael Sancho Kolster, Primož Peterlin, Julia Garayoa Roca, Paola Caprile, Costas Zervides
The aim of the guideline presented in this article is to unify the test parameters for image quality evaluation and radiation output in all types of cone-beam computed tomography (CBCT) systems. The applications of CBCT spread over dental and interventional radiology, guided surgery and radiotherapy. The chosen tests provide the means to objectively evaluate the performance and monitor the constancy of the imaging chain. Experience from all involved associations has been collected to achieve a consensus that is rigorous and helpful for the practice...
July 2017: Physica Medica: PM
https://www.readbyqxmd.com/read/28585520/iterative-image-domain-ring-artifact-removal-in-cone-beam-ct
#10
Xiaokun Liang, Zhicheng Zhang, Tianye Niu, Shaode Yu, Shibin Wu, Zhicheng Li, Huailing Zhang, Yaoqin Xie
Ring artifacts in cone beam computed tomography (CBCT) images are caused by pixel gain variations using flat-panel detectors, and may lead to structured non-uniformities and deterioration of image quality. The purpose of this study is to propose a method of general ring artifact removal in CBCT images. This method is based on the polar coordinate system, where the ring artifacts manifest as stripe artifacts. Using relative total variation, the CBCT images are first smoothed to generate template images with fewer image details and ring artifacts...
July 7, 2017: Physics in Medicine and Biology
https://www.readbyqxmd.com/read/28584324/absorbed-doses-for-patients-undergoing-panoramic-radiography-cephalometric-radiography-and-cbct
#11
Małgorzata Wrzesień, Jerzy Olszewski
OBJECTIVES: Contemporary dental radiology offers a wide spectrum of imaging methods but it also contributes to an increase in the participation of dental radiological diagnosis in the patient's exposure to ionizing radiation. The aim of this study is to determine the absorbed doses of the brain, spinal column, thyroid and eye lens for patients during panoramic radiography, cephalometric radiography and cone beam computed tomography (CBCT). MATERIAL AND METHODS: The thermoluminescent dosimetry and anthropomorphic phantom was used for measuring the doses...
May 12, 2017: International Journal of Occupational Medicine and Environmental Health
https://www.readbyqxmd.com/read/28583620/percutaneous-image-guided-screws-meditated-osteosynthesis-of-impeding-and-pathological-insufficiency-fractures-of-the-femoral-neck-in-non-surgical-cancer-patients
#12
Roberto Luigi Cazzato, Julien Garnon, Georgia Tsoumakidou, Guillaume Koch, Jean Palussière, Afshin Gangi, Xavier Buy
AIM: To present percutaneous image-guided screw-mediated osteosynthesis (PIGSMO) for fixation of impending fractures (ImF) and non-displaced/mildly displaced pathological/insufficient fractures (PF/InF) of the femoral neck in non-surgical cancer patients. MATERIALS AND METHODS: This is a double-centre single-arm observational study. Retrospective review of electronic records identified all oncologic patients who had undergone femoral neck PIGSMO. Inclusion criteria were: non-displaced or mildly displaced PF/InF, and ImF (Mirels' score ≥8); life expectancy ≥1 month; unsuitability for surgical treatment due to sub-optimal clinical fitness, refusal of consent, or unacceptable delay to systemic therapy...
May 2017: European Journal of Radiology
https://www.readbyqxmd.com/read/28583248/pediatric-phantom-dosimetry-of-kodak-9000-cone-beam-computed-tomography
#13
Juan F Yepes, Megan R Booe, Brian J Sanders, James E Jones, Ygal Ehrlich, John B Ludlow, Brandon Johnson
PURPOSE: The purpose of the study was to evaluate the radiation dose of the Kodak 9000 cone-beam computed tomography (CBCT) device for different anatomical areas using a pediatric phantom. METHODS: Absorbed doses resulting from maxillary and mandibular region three by five cm CBCT volumes of an anthropomorphic 10-year-old child phantom were acquired using optical stimulated dosimetry. Equivalent doses were calculated for radiosensitive tissues in the head and neck area, and effective dose for maxillary and mandibular examinations were calculated following the 2007 recommendations of the International Commission on Radiological Protection (ICRP)...
May 15, 2017: Pediatric Dentistry
https://www.readbyqxmd.com/read/28574115/a-comparative-study-of-cone-beam-computed-tomography-and-periapical-radiographs-in-decision-making-after-endodontic-instrument-fractures
#14
Senem Y Özer, Gökhan Özkan, Emrah Çetin, Hicran D Özkan
PURPOSE: This study aimed to compare the diagnostic efficacies of periapical radiographs (PRs) and cone-beam computed tomography (CBCT) scans on clinicians' decision-making in diagnosing and providing treatment of fractured instruments in root canals during glide path preparation. METHODS: 40 maxillary molar teeth were selected and randomly divided into 4 groups. In each experimental group (n = 10), Hedstroem stainless steel instruments were fractured in mesiobuccal (MB) or distobuccal (DB) root canals...
May 26, 2017: International Journal of Artificial Organs
https://www.readbyqxmd.com/read/28571887/an-evaluation-of-motion-mitigation-techniques-for-pancreatic-sbrt
#15
Warren G Campbell, Bernard L Jones, Tracey Schefter, Karyn A Goodman, Moyed Miften
BACKGROUND AND PURPOSE: Ablative radiation therapy can be beneficial for pancreatic cancer, and motion mitigation helps to reduce dose to nearby organs-at-risk. Here, we compared two competing methods of motion mitigation-abdominal compression and respiratory gating. MATERIALS AND METHODS: CBCT scans of 19 pancreatic cancer patients receiving stereotactic body radiation therapy were acquired with and without abdominal compression, and 3D target motion was reconstructed from CBCT projection images...
July 2017: Radiotherapy and Oncology: Journal of the European Society for Therapeutic Radiology and Oncology
https://www.readbyqxmd.com/read/28570626/surface-radiation-dose-comparison-of-a-dedicated-extremity-cone-beam-computed-tomography-cbct-device-and-a-multidetector-computed-tomography-mdct-machine-in-pediatric-ankle-and-wrist-phantoms
#16
Sebastian Tschauner, Robert Marterer, Eszter Nagy, Georg Apfaltrer, Michael Riccabona, Georg Singer, Georg Stücklschweiger, Helmuth Guss, Erich Sorantin
OBJECTIVES: To evaluate and compare surface doses of a cone beam computed tomography (CBCT) and a multidetector computed tomography (MDCT) device in pediatric ankle and wrist phantoms. METHODS: Thermoluminescent dosimeters (TLD) were used to measure and compare surface doses between CBCT and MDCT in a left ankle and a right wrist pediatric phantom. In both modalities adapted pediatric dose protocols were utilized to achieve realistic imaging conditions. All measurements were repeated three times to prove test-retest reliability...
2017: PloS One
https://www.readbyqxmd.com/read/28556204/optimal-combination-of-anti-scatter-grids-and-software-correction-for-cbct-imaging
#17
Uros Stankovic, Lennert S Ploeger, Marcel van Herk, Jan-Jakob Sonke
PURPOSE: CBCT has been widely adopted in clinical practice for image-guided radiotherapy. Soft tissue contrast and Hounsfield units are impaired to presence of scattered radiation. In our previous work we proposed a high selectivity anti-scatter grid (ASG) as a possible solution to the problem. An alternative approach is the application of iterative scatter correction using deconvolution with scatter point spread function (PSF). The purpose of this work was to compare the performance of ASGs with different selectivity with and without the iterative and uniform scatter corrections in terms of CBCT image quality...
May 29, 2017: Medical Physics
https://www.readbyqxmd.com/read/28555157/accuracy-evaluation-of-a-stereolithographic-surgical-template-for-dental-implant-insertion-using-3d-superimposition-protocol
#18
Corina Marilena Cristache, Silviu Gurbanescu
THE AIM: of this study was to evaluate the accuracy of a stereolithographic template, with sleeve structure incorporated into the design, for computer-guided dental implant insertion in partially edentulous patients. MATERIALS AND METHODS: Sixty-five implants were placed in twenty-five consecutive patients with a stereolithographic surgical template. After surgery, digital impression was taken and 3D inaccuracy of implants position at entry point, apex, and angle deviation was measured using an inspection tool software...
2017: International Journal of Dentistry
https://www.readbyqxmd.com/read/28542254/evaluations-of-the-setup-discrepancy-between-brainlab-6d-exactrac-and-cone-beam-computed-tomography-used-with-the-imaging-guidance-system-novalis-tx-for-intracranial-stereotactic-radiosurgery
#19
Se An Oh, Jae Won Park, Ji Woon Yea, Sung Kyu Kim
The objective of this study was to evaluate the setup discrepancy between BrainLAB 6 degree-of-freedom (6D) ExacTrac and cone-beam computed tomography (CBCT) used with the imaging guidance system Novalis Tx for intracranial stereotactic radiosurgery. We included 107 consecutive patients for whom white stereotactic head frame masks (R408; Clarity Medical Products, Newark, OH) were used to fix the head during intracranial stereotactic radiosurgery, between August 2012 and July 2016. The patients were immobilized in the same state for both the verification image using 6D ExacTrac and online 3D CBCT...
2017: PloS One
https://www.readbyqxmd.com/read/28535919/precision-iort-image-guided-intraoperative-radiation-therapy-igiort-using-online-treatment-planning-including-tissue-heterogeneity-correction
#20
Frank Schneider, Frederic Bludau, Sven Clausen, Jens Fleckenstein, Udo Obertacke, Frederik Wenz
BACKGROUND: To the present date, IORT has been eye and hand guided without treatment planning and tissue heterogeneity correction. This limits the precision of the application and the precise documentation of the location and the deposited dose in the tissue. Here we present a set-up where we use image guidance by intraoperative cone beam computed tomography (CBCT) for precise online Monte Carlo treatment planning including tissue heterogeneity correction. MATERIALS AND METHODS: An IORT was performed during balloon kyphoplasty using a dedicated Needle Applicator...
May 2017: Physica Medica: PM
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