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https://www.readbyqxmd.com/read/27915135/primary-stability-and-viscoelastic-displacement-of-mini-implant-system-under-loading
#1
Jim Lee, Yong-Hoon Jeong, Joseph Pittman, Toru Deguchi, William M Johnston, Henry W Fields, Do-Gyoon Kim
BACKGROUND: The objectives of the current study were to examine the effects of mini-implant diameters on 1) primary stability before bone properties are changed by active peri-implant bone remodeling and 2) the time-dependent displacement of mini-implant systems in bone under a functional radial loading and their associations with bone mineral density. METHODS: Twenty one, 8mm length mini-implants (7 each for 1.4mm, 1.6mm, and 2mm diameters) were placed in mandibular sections of human cadavers (4 males and 3 females, average 69...
November 24, 2016: Clinical Biomechanics
https://www.readbyqxmd.com/read/27914917/the-role-of-dual-phase-cone-beam-ct-in-predicting-short-term-response-after-transarterial-chemoembolization-for-hepatocellular-carcinoma
#2
Kerstin Müller, Sanjit Datta, Sonja Gehrisch, Moiz Ahmad, Mohammed Ahmed Abdelrazek Mohammed, Jarrett Rosenberg, Gloria L Hwang, John D Louie, Daniel Y Sze, Nishita Kothary
PURPOSE: To identify computational and qualitative features derived from dual-phase cone-beam CT that predict short-term response in patients undergoing transarterial chemoembolization for hepatocellular carcinoma (HCC). MATERIALS AND METHODS: This retrospective study included 43 patients with 59 HCCs. Six features were extracted, including intensity of tumor enhancement on both phases and characteristics of the corona on the washout phase. Short-term response was evaluated by modified Response Evaluation Criteria in Solid Tumors on follow-up imaging, and extracted features were correlated to response using univariate and multivariate analyses...
November 30, 2016: Journal of Vascular and Interventional Radiology: JVIR
https://www.readbyqxmd.com/read/27913652/icrp-publication-129-radiological-protection-in-cone-beam-computed-tomography-cbct
#3
Anja Almén
No abstract text is available yet for this article.
November 2016: Radiation Protection Dosimetry
https://www.readbyqxmd.com/read/27912213/histomorphometric-evaluation-of-two-different-bone-substitutes-in-sinus-augmentation-procedures-a-randomized-controlled-trial-in-humans
#4
Ruggero Rodriguez Baena, Roberta Pastorino, Enrico Felice Gherlone, Letizia Perillo, Saturnino Marco Lupi, Alessandra Lucchese
PURPOSE: The histomorphometric results of sinus floor augmentation with deproteinized bovine bone (DBB) and a new fully synthetic bone substitute, poly(lactic-co-glycolic acid/hydroxyapatite) (PLGA/HA), were compared in humans. MATERIALS AND METHODS: Twelve maxillary sinuses of eight patients requiring major maxillary sinus floor augmentation and free of concomitant conditions (ASA scores 1 and 2) were studied. Lateral sinus augmentation was performed using DBB or PLGA/HA grafts; sites were randomly assigned to control or test groups...
December 2, 2016: International Journal of Oral & Maxillofacial Implants
https://www.readbyqxmd.com/read/27912075/is-cone-beam-computed-tomography-always-necessary-for-dental-implant-placement
#5
George Deeb, Ludmils Antonos, Samuel Tack, Caroline Carrico, Daniel Laskin, Janina Golob Deeb
PURPOSE: The use of cone-beam computed tomography (CBCT) for evaluation of patients for dental implants has gained considerable popularity. This retrospective cohort study was designed to determine whether using a clinical examination and a panoramic radiograph (Panorex) for implant selection and determining the need for bone grafting would be comparable to using CBCT in routine implant cases. PATIENTS AND METHODS: Implant size and need for bone grafting were initially determined in 82 patients using a panoramic radiograph and clinical examination...
November 15, 2016: Journal of Oral and Maxillofacial Surgery
https://www.readbyqxmd.com/read/27911351/evaluation-of-differential-phase-contrast-cone-beam-ct-imaging-system
#6
Jiangkun Liu, Weixing Cai, Ruola Ning
Grating-based differential phase contrast (DPC) imaging enables the use of a hospital-grade X-ray tube, but compromises the image quality due to insufficiently coherent illumination. In this research, a bench-top DPC cone beam CT (DPC-CBCT) was systematically evaluated and compared with the traditional attenuation-based CBCT in terms of contrast to noise ratio, noise property, and contrast resolution through phantom studies. In order to evaluate DPC-CBCT for soft tissue imaging, breast specimen and small animal studies were carried out...
November 30, 2016: Journal of X-ray Science and Technology
https://www.readbyqxmd.com/read/27910717/dose-optimisation-for-assessment-of-periodontal-structures-in-cone-beam-ct-examinations
#7
Ayman Al-Okshi, Chrysoula Theodorakou, Christina Lindh
OBJECTIVE: To investigate the relationship between dose and image quality for a dedicated dental Cone Beam CT (CBCT) scanner using different scanning protocols and to set up an optimal imaging protocol for assessment of periodontal structures. METHODS: Radiation dose and image quality measurements were made using the 3D Accuitomo 170 dental CBCT scanner. The SedentexCT IQ phantom was used to investigate the relationship between contrast-to-noise ratio (CNR) and dose-area product (DAP)...
December 2, 2016: Dento Maxillo Facial Radiology
https://www.readbyqxmd.com/read/27910418/observation-of-hohlraum-wall-motion-with-spectrally-selective-x-ray-imaging-at-the-national-ignition-facility
#8
N Izumi, N B Meezan, L Divol, G N Hall, M A Barrios, O Jones, O L Landen, J J Kroll, S A Vonhof, A Nikroo, J Jaquez, C G Bailey, C M Hardy, R B Ehrlich, R P J Town, D K Bradley, D E Hinkel, J D Moody
The high fuel capsule compression required for indirect drive inertial confinement fusion requires careful control of the X-ray drive symmetry throughout the laser pulse. When the outer cone beams strike the hohlraum wall, the plasma ablated off the hohlraum wall expands into the hohlraum and can alter both the outer and inner cone beam propagations and hence the X-ray drive symmetry especially at the final stage of the drive pulse. To quantitatively understand the wall motion, we developed a new experimental technique which visualizes the expansion and stagnation of the hohlraum wall plasma...
November 2016: Review of Scientific Instruments
https://www.readbyqxmd.com/read/27909659/reliability-of-the-planned-pedicle-screw-trajectory-versus-the-actual-pedicle-screw-trajectory-using-intra-operative-3d-ct-and-image-guidance
#9
Catherine A Miller, Charles G Ledonio, Matthew A Hunt, Farhan Siddiq, David W Polly
BACKGROUND: Technological advances, including navigation, have been made to improve safety and accuracy of pedicle screw fixation. We evaluated the accuracy of the virtual screw placement (Stealth projection) compared to actual screw placement (intra-operative O-Arm) and examined for differences based on the distance from the reference frame. METHODS: A retrospective evaluation of prospectively collected data was conducted from January 2013 to September 2013. We evaluated thoracic and lumbosacral pedicle screws placed using intraoperative O-arm and Stealth navigation by obtaining virtual screw projections and intraoperative O-arm images after screw placement...
2016: International Journal of Spine Surgery
https://www.readbyqxmd.com/read/27908285/prevalence-and-location-of-the-secondary-mesiobuccal-canal-in-1-100-maxillary-molars-using-cone-beam-computed-tomography
#10
Pablo Betancourt, Pablo Navarro, Gonzalo Muñoz, Ramón Fuentes
BACKGROUND: Several articles have used cone beam computed tomography (CBCT) to study the morphology of the maxillary molars and to ascertain its ability to visualize the second mesiobuccal canal (MB2); however, its geometric location has not been examined in depth. The aim of this study was to describe in vivo the prevalence and location of the MB2 in the mesiobuccal root of the first maxillary molar (1MM) and the second maxillary molar (2MM) through CBCT imaging. METHODS: Five hundred fifty CBCT images of the 1MM and 550 of the 2MM were analyzed...
December 1, 2016: BMC Medical Imaging
https://www.readbyqxmd.com/read/27904450/survival-of-patients-with-intermediate-stage-hepatocellular-carcinoma-treated-with-superselective-transarterial-chemoembolization-using-doxorubicin-loaded-dc-bead-under-cone-beam-computed-tomography-control
#11
Peter Popovic, Borut Stabuc, Rado Jansa, Manca Garbajs
BACKGROUND: The purpose of this retrospective study was to evaluate treatment response, adverse events and survival rates of patients with intermediate stage HCC treated with superselective doxorubicin-loaded DC Bead transarterial chemoembolization (DEBDOX) under cone beam computed tomography (CBCT) control. PATIENTS AND METHODS: Between October 2010 and June 2012, 35 consecutive patients with intermediate stage HCC (32 male, 3 female; average age, 67.5 ± 7.8 years; 22 patients Child-Pugh class A, 8 class B, 5 without cirrhosis) were treated with DEBDOX TACE...
December 1, 2016: Radiology and Oncology
https://www.readbyqxmd.com/read/27901233/maxillary-dentoalveolar-assessment-following-retraction-of-maxillary-incisors-a-preliminary-study
#12
Tiago Maia Fernandes Oliveira, Lígia Vieira Claudino, Cláudia Trindade Mattos, Eduardo Franzotti Sant'Anna
Objective: The aim of this preliminary study was to assess changes in tooth length and alveolar thickness following retraction of maxillary incisors. Methods: A total of 11 patients presenting severe maxillary dentoalveolar protrusion revealed by initial (T1) cone-beam computed tomography (CBCT), and whose treatment plan included extraction of maxillary first premolars and retraction of maxillary incisors, were selected and submitted to CBCT examination one month after the end of incisors retraction (T2)...
September 2016: Dental Press Journal of Orthodontics
https://www.readbyqxmd.com/read/27900591/treatment-of-lung-tumours-with-high-energy-microwave-ablation-a-single-centre-experience
#13
Anna Maria Ierardi, Andrea Coppola, Natalie Lucchina, Gianpaolo Carrafiello
The purpose of our study is to report safety, technical success, effectiveness, local progression-free survival (LPFS) and overall survival of percutaneous microwave ablation (MWA) to treat lung tumours unsuitable for surgery. Nineteen patients with thirty-one tumours (mean diameter 2.4 cm) underwent percutaneous MWA in 28 sessions. Microwave ablation was carried out using a 2450-MHz generator (Emprint/Covidien, Boulder, CO, USA). Procedures were performed under cone-beam CT (CBCT) and under fluoro-CT (one session) guidance...
January 2017: Medical Oncology
https://www.readbyqxmd.com/read/27897156/quantitative-evaluation-of-the-mechanical-risks-caused-by-focal-cartilage-defects-in-the-knee
#14
Mikko S Venäläinen, Mika E Mononen, Jari Salo, Lasse P Räsänen, Jukka S Jurvelin, Juha Töyräs, Tuomas Virén, Rami K Korhonen
Focal cartilage lesions can proceed to severe osteoarthritis or remain unaltered even for years. A method to identify high risk defects would be of utmost importance to guide clinical decision making and to identify the patients that are at the highest risk for the onset and progression of osteoarthritis. Based on cone beam computed tomography arthrography, we present a novel computational model for evaluating changes in local mechanical responses around cartilage defects. Our model, based on data obtained from a human knee in vivo, demonstrated that the most substantial alterations around the defect, as compared to the intact tissue, were observed in minimum principal (compressive) strains and shear strains...
November 29, 2016: Scientific Reports
https://www.readbyqxmd.com/read/27896211/comparison-of-postoperative-changes-in-the-distal-and-proximal-segments-between-conventional-and-sliding-mini-plate-fixation-following-mandibular-setback
#15
Seong-Sik Kim, Kyoung-Ho Kwak, Ching-Chang Ko, Soo-Byung Park, Woo-Sung Son, Yong-Il Kim
OBJECTIVE: The purpose of the present study was to evaluate the postoperative three-dimensional (3D) changes in the proximal segments after mandibular setback sagittal split ramus osteotomy and to compare the changes between the conventional mini-plate fixation and semi-rigid sliding plate fixation. METHODS: Cone-beam computed tomography (CBCT) images were used to evaluate the postoperative 3D changes in the proximal segments during the healing process. CBCT images were superimposed using the symphysis and the lower anterior mandible as references...
November 2016: Korean Journal of Orthodontics
https://www.readbyqxmd.com/read/27896208/relationship-between-maturation-indices-and-morphology-of-the-midpalatal-suture-obtained-using-cone-beam-computed-tomography-images
#16
Hong-Ik Jang, Sang-Cheol Kim, Jong-Moon Chae, Kyung-Hwa Kang, Jin-Woo Cho, Na-Young Chang, Keun-Young Lee, Jin-Hyoung Cho
OBJECTIVE: The purpose of this study was to determine whether predicting maturation of the midpalatal suture is possible by classifying its morphology on cone-beam computed tomography (CBCT) images and to investigate relationships with other developmental age indices. METHODS: The morphology of the midpalatal suture was assessed by using CBCT images of 99 patients. Axial plane images of the midpalatal suture were classified into five stages according to the classification scheme...
November 2016: Korean Journal of Orthodontics
https://www.readbyqxmd.com/read/27895964/half-fan-based-intensity-weighted-region-of-interest-imaging-for-low-dose-cone-beam-ct-in-image-guided-radiation-therapy
#17
Boyeol Yoo, Kihong Son, Rizza Pua, Jinsung Kim, Alexander Solodov, Seungryong Cho
OBJECTIVES: With the increased use of computed tomography (CT) in clinics, dose reduction is the most important feature people seek when considering new CT techniques or applications. We developed an intensity-weighted region-of-interest (IWROI) imaging method in an exact half-fan geometry to reduce the imaging radiation dose to patients in cone-beam CT (CBCT) for image-guided radiation therapy (IGRT). While dose reduction is highly desirable, preserving the high-quality images of the ROI is also important for target localization in IGRT...
October 2016: Healthcare Informatics Research
https://www.readbyqxmd.com/read/27895878/evaluation-of-visibility-of-foreign-bodies-in-the-maxillofacial-region-comparison-of-computed-tomography-cone-beam-computed-tomography-ultrasound-and-magnetic-resonance-imaging
#18
Solmaz Valizadeh, Hamidreza Pouraliakbar, Leila Kiani, Yaser Safi, Leila Alibakhshi
BACKGROUND: Detection of foreign bodies (FBs) is challenging. Selection of a fast and affordable imaging modality to locate the FB with minimal patient radiation dose is imperative. OBJECTIVES: This study sought to compare four commonly used imaging modalities namely cone beam computed tomography (CBCT), magnetic resonance imaging (MRI), computed tomography (CT), and ultrasound (US) for detection of FBs in the head and neck region. MATERIALS AND METHODS: In this in vitro study, iron, glass, stone, wood, asphalt, and tooth samples measuring 0...
October 2016: Iranian Journal of Radiology: a Quarterly Journal Published By the Iranian Radiological Society
https://www.readbyqxmd.com/read/27895867/detection-of-second-mesiobuccal-canals-in-maxillary-first-molars-using-a-new-angle-of-cone-beam-computed-tomography
#19
Ali Murat Aktan, Cihan Yildirim, Emre Culha, Erhan Demir, Mehmet Ertugrul Ciftci
BACKGROUND: The localization of the additional canal orifice is one of the primary factors influencing the success of endodontic treatment. To deal with this problem, several techniques that each have their own advantages and disadvantages have been discussed in the literature. OBJECTIVES: The aim of the present in vitro study was to review a new approach to localizing second mesiobuccal (MB2) canals in maxillary first molars using cone beam computed tomography (CBCT)...
October 2016: Iranian Journal of Radiology: a Quarterly Journal Published By the Iranian Radiological Society
https://www.readbyqxmd.com/read/27895491/comparison-of-internal-target-volumes-defined-on-3-dimensional-4-dimensonal-and-cone-beam-ct-images-of-non-small-cell-lung-cancer
#20
Fengxiang Li, Jianbin Li, Zhifang Ma, Yingjie Zhang, Jun Xing, Huanpeng Qi, Dongping Shang
PURPOSE: The purpose of this study was to compare the positional and volumetric differences of internal target volumes defined on three-dimensional computed tomography (3DCT), four-dimensional CT (4DCT), and cone-beam CT (CBCT) images of non-small-cell lung cancer (NSCLC). MATERIALS AND METHODS: Thirty-one patients with NSCLC sequentially underwent 3DCT and 4DCT simulation scans of the thorax during free breathing. The first CBCT was performed and registered to the planning CT using the bony anatomy registration during radiotherapy...
2016: OncoTargets and Therapy
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