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https://www.readbyqxmd.com/read/29166133/dosimetric-impact-of-gastrointestinal-air-column-in-radiation-treatment-of-pancreatic-cancer
#1
Neil C Estabrook, Jonathan B Corn, Marvene E Ewing, Higinia R Cardenes, Indra J Das
OBJECTIVE: Dosimetric evaluation of air column in gastro-intestinal (GI) structures in IMRT of pancreatic cancer. METHODS: Nine sequential patients were retrospectively chosen for dosimetric analysis of air column in the GI apparatus in pancreatic cancer using cone beam CT (CBCT). The 4DCT was used for target and organs at risk (OARs) and non-coplanar IMRT was used for treatment. Once/week, these patients underwent CBCT for air filling, isocenter verification and dose calculations retrospectively...
November 22, 2017: British Journal of Radiology
https://www.readbyqxmd.com/read/29165748/orbital-arteriovenous-fistula-around-the-optic-nerve-treated-by-transvenous-embolization
#2
Masayuki Sato, Yuji Matsumaru, Tatsuo Amano, Yuki Kamiya
(Background) Intraorbital arteriovenous fistula is a very rare disease, therefore an optimal treatment strategy has not yet been established. Here we describe the use of high-resolution cone-beam CT (CBCT) and selective angiography to visualize the detailed anatomy of orbital vessels. The information provided by the intra-operative imaging led to a change in treatment strategy and eventually to successful transvenous coil embolization. (Clinical presentation) A 55-year-old man presented with right exophthalmos, chemosis and diplopia 4 months previously...
October 11, 2017: Turkish Neurosurgery
https://www.readbyqxmd.com/read/29165021/two-years-of-tamoxifen-or-no-adjuvant-systemic-therapy-for-patients-with-high-risk-breast-cancer-long-term-follow-up-of-the-copenhagen-breast-cancer-trial
#3
Maj-Britt Jensen, Jens Fabricius Krarup, Torben Palshof, Henning T Mouridsen, Bent Ejlertsen
BACKGROUND: The Copenhagen Breast Cancer Trial (CBCT) randomly assigned patients with early breast cancer to two years of tamoxifen or placebo and we evaluated the effect over the following four decades. PATIENT AND METHODS: Between 1975 and 1978, 327 patients with primary breast cancer were randomly assigned to two years of daily placebo or tamoxifen. Survival statistics was collected from the Danish Civil Registration System. RESULTS: The five-year invasive breast cancer recurrence (BCR) rate was 43...
November 22, 2017: Acta Oncologica
https://www.readbyqxmd.com/read/29164183/removal-of-a-severely-impacted-mandibular-third-molar-minimizing-the-risks-of-compromised-periodontium-nerve-injury-and-mandibular-fracture
#4
Christos Tsamis, Stylianos Rodiou, Athanasios Stratos, Nikolaos Gkantidis
A technique is presented for severely impacted and dentigerous-cyst-related mandibular third molar removal, avoiding any associated risks. CASE PRESENTATION: A healthy patient complained about unpleasant smell and taste in the mouth and unilateral extraoral palpation of a protuberance, at the right corner of the mandible. Restricted field CBCT showed a severely impacted third molar, which penetrated the inferior cortical bone of the mandibular corner and was associated with a dentigerous cyst that had resorbed considerable bone in the region...
November 21, 2017: Quintessence International
https://www.readbyqxmd.com/read/29160405/dosimetry-in-cbct-with-different-protocols-emphasis-on-small-fovs-including-exams-for-tmj
#5
Helena Aguiar Ribeiro Nascimento, Marcos Ely Almeida Andrade, Marco Antonio Gomes Frazão, Eduarda Helena Leandro Nascimento, Flavia Maria Moraes Ramos-Perez, Deborah Queiroz Freitas
This study aimed to estimate the absorbed dose in cone beam computed tomography (CBCT) exams according to different exposure parameters and size and position of the field of view (FOV). In addition was compared the absorbed dose of two smaller FOV scans with that of a larger FOV scan for evaluation of temporomandibular joint (TMJ), as it is a bilateral structure. CBCT scans were obtained on OP300 Maxio unit varying scanning mode (standard, high and endo) as well as size (5x5, 6x8 and 8x15 cm) and positioning of FOV...
July 2017: Brazilian Dental Journal
https://www.readbyqxmd.com/read/29160343/the-effect-of-hard-tissue-surgical-changes-on-soft-tissue-displacement-a-pilot-cbct-study
#6
Leonardo Koerich, Daniel Paludo Brunetto, Eduardo Terumi Blatt Ohira
INTRODUCTION: This pilot study had as main objective to test the reliability of a new method to evaluate orthognathic surgery outcomes and also, to understand the effect of hard tissue changes on soft tissue displacement. METHODS: The sample consisted of eight patients that underwent bimaxillary advancement and had CBCT at two time points (before surgery and 6-8 months follow-up). Voxel-based cranial base superimposition was used to register the scans. A different technique of iterative closest point (ICP) was used to measure and correlate the changes...
September 2017: Dental Press Journal of Orthodontics
https://www.readbyqxmd.com/read/29159206/influence-of-patient-position-and-other-inherent-factors-on-image-quality-in-two-different-cone-beam-computed-tomography-cbct-devices
#7
Ninita Lindfors, Henrik Lund, Hans Johansson, Annika Ekestubbe
Objectives: The aim of this in vitro study was to evaluate how a deviation from the horizontal plane, affects the image quality in two different CBCT-devices. Methods: A phantom head SK150 (RANDO, The Phantom Laboratory, Salem, NY, USA) was examined in two CBCT-units: Accuitomo 80 and Veraviewepocs 3D R100 (J. Morita Mfg. Corp. Kyoto, Japan). The phantom head was placed with the hard palate parallel to the horizontal plane and tilted 20 ° backwards. Exposures were performed with different field of views (FOVs), voxel sizes, slice thicknesses and exposure settings...
2017: European Journal of Radiology Open
https://www.readbyqxmd.com/read/29155538/aetiological-histopathological-clinical-diagnostic-and-therapeutical-features-of-idiopathic-cervical-resorption
#8
Virginia Robles Gijón, Cristina Lucena Martín, Rosa Mª Pulgar Encinas, José Manuel Navajas
Root resorption is the loss of hard dental tissue as a result of odontoclastic action involving vital and pulpless teeth. Cervical root resorption (CRR) is a type of external resorption which usually occurs immediately below the epithelial attachment of the tooth in the cervical region. The idiopathic cervical resorption (ICR) refers to a clinical situation in which all other causes, whether local or systemic, have been ruled out as the origin of the disease. The early stage is asymptomatic and might be diagnosed by a routine radiograph or a clinical examination...
December 2016: Dental Update
https://www.readbyqxmd.com/read/29154259/evaluation-of-coefficients-to-derive-organ-and-effective-doses-from-cone-beam-ct-cbct-scans-a-monte-carlo-study
#9
Abdullah Abuhaimed, Colin J Martin
Regular imaging is used throughout image guided radiation therapy (IGRT) to improve treatment delivery. In order for treatment procedures to be optimized, the doses delivered by imaging exposures should be taken into account. CT dosimetry methods based on the CT dose index (CTDI), measured with a 100 mm long pencil ionization chamber (CTDI<sub>100</sub>) in standard phantoms, are not designed for the cone beam CT (CBCT) imaging systems used in radiotherapy, therefore a modified version has been proposed for CBCT by the International Electrotechnical Commission (CTDI<sub>IEC</sub>)...
November 20, 2017: Journal of Radiological Protection: Official Journal of the Society for Radiological Protection
https://www.readbyqxmd.com/read/29153985/diagnosis-of-mesiodistal-vertical-root-fractures-in-teeth-with-metal-posts-influence-of-applying-filters-in-cone-beam-computed-tomography-images-at-different-resolutions
#10
Débora De Martin E Silva, Celso Neiva Campos, Antônio Carlos Pires Carvalho, Karina Lopes Devito
INTRODUCTION: The aim of this article was to evaluate the influence of applying filters in cone-beam computed tomography (CBCT) images at different resolutions. These CBCT images were obtained for diagnosing mesiodistal vertical root fractures (VRFs) in teeth with metal posts. METHODS: Forty teeth were treated endodontically, and 20 received metal posts. Ten teeth without posts and 10 teeth with posts were subjected to VRF in the mesiodistal direction. The sample was submitted to periapical radiographs and CBCT exams with a voxel of 0...
November 16, 2017: Journal of Endodontics
https://www.readbyqxmd.com/read/29153734/the-incidence-of-second-mesiobuccal-canals-located-in-maxillary-molars-with-the-aid-of-cone-beam-computed-tomography
#11
Ben Studebaker, Lars Hollender, Lloyd Mancl, James D Johnson, Avina Paranjpe
INTRODUCTION: Many endodontic treatment failures in maxillary molars result from missed second mesiobuccal (MB2) canals. An MB2 canal orifice is present in as many as 95% of maxillary molars, but these canals are not always located during endodontic procedures. Additional tools, such as cone-beam computed tomographic (CBCT) imaging, may be needed to locate these canals in maxillary molars. Hence, the aims of this study were to investigate the frequency of use of CBCT imaging during the treatment of maxillary molars and to evaluate the influence of its use on the detection of MB2 canals...
November 15, 2017: Journal of Endodontics
https://www.readbyqxmd.com/read/29153368/diagnostic-value-of-cone-beam-computed-tomography-cbct-in-occult-scaphoid-and-wrist-fractures
#12
Christophe Borel, Ahmed Larbi, Stephanie Delclaux, Franck Lapegue, Helene Chiavassa-Gandois, Nicolas Sans, Marie Faruch-Bilfeld
OBJECTIVE: Evaluate the diagnostic value of cone beam computed tomography (CBCT) for scaphoid and wrist fractures that are missed on standard radiographs. MATERIALS AND METHODS: Between September 2014 and October 2015, we prospectively enrolled 49 patients with a clinically suspected scaphoid fracture following an acute injury but had normal radiographs. Each patients underwent radiographs, CBCT and (magnetic resonance imaging) MRI within 7days of the initial injury event...
December 2017: European Journal of Radiology
https://www.readbyqxmd.com/read/29152835/intra-and-inter-fractional-liver-and-lung-tumor-motions-treated-with-sbrt-under-active-breathing-control
#13
Lan Lu, Claudiu Diaconu, Toufik Djemil, Gregory Mm Videtic, May Abdel-Wahab, Naichang Yu, John Greskovich, Kevin L Stephans, Ping Xia
PURPOSE: To assess intra- and inter-fractional motions of liver and lung tumors using active breathing control (ABC). METHODS AND MATERIALS: Nineteen patients with liver cancer and 15 patients with lung cancer treated with stereotactic body radiotherapy (SBRT) were included in this retrospective study. All patients received a series of three CTs at simulation to test breath-hold reproducibility. The centroids of the whole livers and of the lung tumors from the three CTs were compared to assess intra-fraction variability...
November 20, 2017: Journal of Applied Clinical Medical Physics
https://www.readbyqxmd.com/read/29152679/a-comparative-study-of-cone-beam-computed-tomography-and-conventional-radiography-in-diagnosing-the-extent-of-root-resorptions
#14
Elham Alamadi, Hisham Alhazmi, Ken Hansen, Ted Lundgren, Julia Naoumova
BACKGROUND: Root resorptions are assessed and diagnosed using different radiographical techniques. A comparison of the ability to assess resorptions on two-dimensional (2D) and three-dimensional (3D) radiographs is, hitherto, lacking. The aims of this study were to evaluate the accuracy of 2D (periapical radiographs, PA and panoramic radiograph, PAN) and 3D (cone beam computed tomography, CBCT) radiographic techniques in measuring slanted root resorptions compared to the true resorptions, a histological gold standard, in addition to a comparison of all the radiographic techniques to each other...
November 20, 2017: Progress in Orthodontics
https://www.readbyqxmd.com/read/29151799/endodontic-management-of-maxillary-third-molar-with-mb2-vertucci-type-iv-canal-configuration-diagnosed-with-cone-beam-computed-tomography-a-case-report
#15
Pradeep Jain, Pallav Patni, Pant Yogesh, Vyas Anup
The endodontic treatment of maxillary third molar often poses a challenge even to an experienced endodontist because of their most posterior location in the dental arch, aberrant occlusal anatomy, abnormal root canal configuration and eruption patterns. Owing to these anatomical limitations, their extraction remains the treatment of choice for many clinicians. As we know, retaining every functional component of the dental arch is of prime importance in contemporary dental practice. This clinical case report aims to discuss the endodontic treatment of maxillary third molar with MB2 root canal separated throughout the length and exit at two separate apical foramina (Vertucci type IV) diagnosed with Cone Beam Computed Tomography (CBCT)...
2017: Clujul Medical (1957)
https://www.readbyqxmd.com/read/29148597/three-dimensional-analysis-of-bone-remodeling-following-ridge-augmentation-of-compromised-extraction-sockets-in-periodontitis-patients-a-randomized-controlled-study
#16
Mario Aimetti, Valeria Manavella, Lisa Corano, Elena Ercoli, Cristina Bignardi, Federica Romano
OBJECTIVES: The aim of this study was to analyze linear and volumetric hard tissue changes in severely resorbed alveolar sockets after ridge augmentation procedure and to compare them with spontaneous healing using three-dimensional cone beam computed tomography (CBCT). MATERIAL AND METHODS: Thirty patients (mean age 53.2 ± 6.3 years) requiring tooth extraction for advanced periodontitis were randomly allocated to test and control groups. The test sites were grafted using a collagenated bovine-derived bone (DBBM-C) covered with a collagen membrane, while control sites had spontaneous healing...
November 17, 2017: Clinical Oral Implants Research
https://www.readbyqxmd.com/read/29146395/correlation-between-intraoperative-proximal-segment-rotation-and-post-sagittal-split-ramus-osteotomy-relapse-a-three-dimensional-cone-beam-computed-tomography-study
#17
B-J Choi, B-S Lee, Y-D Kwon, J-W Lee, S-U Yun, K-S Ryu, J-Y Ohe
This study evaluated the effects of proximal segment rotation and the extent of mandibular setback on post-sagittal split ramus osteotomy (SSRO) relapse using three-dimensional (3D) analysis. Thirty-one patients diagnosed with a skeletal class III malocclusion who underwent SSRO alone were enrolled in this study. The movements of the mandibular condyles were assessed using cone beam computed tomography (CBCT) and a 3D imaging program at ≤1 month before the operation (T0), 1 week after the operation (T1), and 6 months (T2) and 1year (T3) postoperative...
November 13, 2017: International Journal of Oral and Maxillofacial Surgery
https://www.readbyqxmd.com/read/29145529/volumetric-bone-measurement-around-dental-implants-using-3d-image-superimposition-a-methodological-and-clinical-pilot-study
#18
Eduardo Aydos Villarinho, André Correia, Alvaro Vigo, Nuno Viriato Ramos, Mário Augusto Pires Vaz, Rosemary Sadami Arai Shinkai
PURPOSE: This study describes the development of a methodology for using three-dimensional (3D) image superimposition to measure volumetric changes in bone level around dental implants in comparison with linear measures. MATERIALS AND METHODS: The sample was comprised of 46 dental implants of 6-mm length and 4.1-mm diameter placed in the posterior maxilla and posterior mandible in 20 patients. All implants received screw-retained single crowns. Radiographic images were taken using cone beam computed tomography (CBCT) and digital periapical radiography after implantation and after 12 and 24 months of functional loading (after crown installation)...
November 16, 2017: International Journal of Prosthodontics
https://www.readbyqxmd.com/read/29143462/evaluation-of-immediate-implants-augmented-with-autogenous-bone-melatonin-composite-graft-in-the-esthetic-zone-a-randomized-controlled-trial
#19
Hala H A Hazzaa, Naglaa Sh El-Kilani, Shadia Abd-Elhameed Elsayed, Phoebe M Abd El Massieh
PURPOSE: To evaluate the clinical and radiographic outcomes following the application of autogenous bone (ABG)/melatonin composite graft around immediate implants in the esthetic zone compared to ABG alone. MATERIALS AND METHODS: Twenty-six patients with two nonrestorable anterior/premolar teeth were randomly classified into two equal groups. Dental implants were immediately inserted either with ABG (control group) or ABG/melatonin (test group). Outcome measures were peri-implant sulcus depth (PD), gingival index (GI), and wound healing scores...
November 16, 2017: Journal of Prosthodontics: Official Journal of the American College of Prosthodontists
https://www.readbyqxmd.com/read/29140376/evaluating-maxillary-sinus-septa-using-cone-beam-computed-tomography-is-there-a-difference-in-frequency-and-type-between-the-dentate-and-edentulous-posterior-maxilla
#20
Martina Schriber, Thomas von Arx, Pedram Sendi, Reinhilde Jacobs, Valerie Ga Suter, Michael M Bornstein
PURPOSE: To analyze and compare the frequency, type, and location of maxillary sinus septa in patients with a dentate and an edentulous posterior maxilla using cone beam computed tomography (CBCT) imaging. MATERIALS AND METHODS: The study consisted of 100 maxillary sinuses: 50 from patients with a dentate and 50 from patients with an edentulous posterior maxilla. The aim was to assess the frequency, morphology, and location of maxillary sinus septa in axial, sagittal, and coronal CBCT images...
November 2017: International Journal of Oral & Maxillofacial Implants
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