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"Digital x-ray"

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https://www.readbyqxmd.com/read/28976845/radiopacity-and-porosity-of-bulk-fill-and-conventional-composite-posterior-restorations-digital-x-ray-analysis
#1
C J Soares, Cmp Rosatto, V F Carvalho, A A Bicalho, Jcg Henriques, A L Faria-E-Silva
OBJECTIVES: To compare radiopacity and porosity as expressed by the presence of voids in restorations carried out using bulk-fill and incremental filling techniques to restore large mesio-occlusal-distal (MOD) cavities. METHODS: Fifty-five molars with MOD preparations were incrementally filled with Filtek Z-350XT (Z350XT) or bulk-fill composite: Filtek Bulk Fill/Z-350XT (FBF/Z350XT), Venus Bulk Fill/Charisma Diamond (VBF/CHA), SDR/Esthet-X HD (SDR/EST-X), Tetric EvoCeram Bulk Fill (TEC)...
October 4, 2017: Operative Dentistry
https://www.readbyqxmd.com/read/28943698/4d-dsa-reconstruction-using-tomosynthesis-projections
#2
Marc Buehler, Jordan M Slagowski, Charles A Mistretta, Charles M Strother, Michael A Speidel
We investigate the use of tomosynthesis in 4D DSA to improve the accuracy of reconstructed vessel time-attenuation curves (TACs). It is hypothesized that a narrow-angle tomosynthesis dataset for each time point can be exploited to reduce artifacts caused by vessel overlap in individual projections. 4D DSA reconstructs time-resolved 3D angiographic volumes from a typical 3D DSA scan consisting of mask and iodine-enhanced C-arm rotations. Tomosynthesis projections are obtained either from a conventional C-arm rotation, or from an inverse geometry scanning-beam digital x-ray (SBDX) system...
February 2017: Proceedings of SPIE
https://www.readbyqxmd.com/read/28943697/localization-of-cardiac-volume-and-patient-features-in-inverse-geometry-x-ray-fluoroscopy
#3
Michael A Speidel, Jordan M Slagowski, David A P Dunkerley, Martin Wagner, Tobias Funk, Amish N Raval
The scanning-beam digital x-ray (SBDX) system is an inverse geometry x-ray fluoroscopy technology that performs real-time tomosynthesis at planes perpendicular to the source-detector axis. The live display is a composite image which portrays sharp features (e.g. coronary arteries) extracted from a 16 cm thick reconstruction volume. We present a method for automatically determining the position of the cardiac volume prior to acquisition of a coronary angiogram. In the algorithm, a single non-contrast frame is reconstructed over a 44 cm thickness using shift-and-add digital tomosynthesis...
February 2017: Proceedings of SPIE
https://www.readbyqxmd.com/read/28943696/automated-3d-coronary-sinus-catheter-detection-using-a-scanning-beam-digital-x-ray-system
#4
David A P Dunkerley, Jordan M Slagowski, Lindsay E Bodart, Michael A Speidel
Scanning-beam digital x-ray (SBDX) is an inverse geometry x-ray fluoroscopy system capable of tomosynthesis-based 3D tracking of catheter electrodes concurrent with fluoroscopic display. To facilitate respiratory motion-compensated 3D catheter tracking, an automated coronary sinus (CS) catheter detection algorithm for SBDX was developed. The technique uses the 3D localization capability of SBDX and prior knowledge of the catheter shape. Candidate groups of points representing the CS catheter are obtained from a 3D shape-constrained search...
February 2017: Proceedings of SPIE
https://www.readbyqxmd.com/read/28879043/fully-automated-joint-space-width-measurement-and-digital-x-ray-radiogrammetry-in-early-ra
#5
Michael Platten, Yogan Kisten, Johan Kälvesten, Laurent Arnaud, Kristina Forslind, Ronald van Vollenhoven
OBJECTIVES: To study fully automated digital joint space width (JSW) and bone mineral density (BMD) in relation to a conventional radiographic scoring method in early rheumatoid arthritis (eRA). METHODS: Radiographs scored by the modified Sharp van der Heijde score (SHS) in patients with eRA were acquired from the SWEdish FarmacOTherapy study. Fully automated JSW measurements of bilateral metacarpals 2, 3 and 4 were compared with the joint space narrowing (JSN) score in SHS...
2017: RMD Open
https://www.readbyqxmd.com/read/28865482/decrease-in-bone-mineral-density-during-three-months-after-diagnosis-of-early-rheumatoid-arthritis-measured-by-digital-x-ray-radiogrammetry-predicts-radiographic-joint-damage-after-one-year
#6
Michael Ziegelasch, Kristina Forslind, Thomas Skogh, Katrine Riklund, Alf Kastbom, Ewa Berglin
BACKGROUND: Periarticular osteopenia is an early sign of incipient joint injury in rheumatoid arthritis (RA), but cannot be accurately quantified using conventional radiography. Digital X-ray radiogrammetry (DXR) is a computerized technique to estimate bone mineral density (BMD) from hand radiographs. The aim of this study was to evaluate whether decrease in BMD of the hands (BMD loss), as determined by DXR 3 months after diagnosis, predicts radiographic joint damage after 1 and 2 years in patients with early RA...
September 2, 2017: Arthritis Research & Therapy
https://www.readbyqxmd.com/read/28853125/placement-and-replacement-rates-of-amalgam-and-composite-restorations-on-posterior-teeth-in-a-military-population
#7
Benjamin D Owen, Peter H Guevara, William Greenwood
OBJECTIVE: Replacement rates of direct dental restorations have been reported to be 37% to 70%, occupying a large proportion of a general dentist's time. Variations in the rate of initial placement and replacement of direct dental restorations may be associated with material placed (amalgam or composite), age, caries risk of the patient, and other factors. The purpose of this research was to clarify where the majority of patient care time is spent as a restorative Army dentist regarding either the initial placement or replacement of failed restorations; and how the location, caries risk, and material used (amalgam or composite) affects replacement rates...
July 2017: U.S. Army Medical Department Journal
https://www.readbyqxmd.com/read/28692677/fux-sim-implementation-of-a-fast-universal-simulation-reconstruction-framework-for-x-ray-systems
#8
Monica Abella, Estefania Serrano, Javier Garcia-Blas, Ines García, Claudia de Molina, Jesus Carretero, Manuel Desco
The availability of digital X-ray detectors, together with advances in reconstruction algorithms, creates an opportunity for bringing 3D capabilities to conventional radiology systems. The downside is that reconstruction algorithms for non-standard acquisition protocols are generally based on iterative approaches that involve a high computational burden. The development of new flexible X-ray systems could benefit from computer simulations, which may enable performance to be checked before expensive real systems are implemented...
2017: PloS One
https://www.readbyqxmd.com/read/28639387/determining-the-orientation-angle-of-directional-leads-for-deep-brain-stimulation-using-computed-tomography-and-digital-x-ray-imaging-a-phantom-study
#9
Alexander Sitz, Mauritius Hoevels, Alexandra Hellerbach, Andreas Gierich, Klaus Luyken, Till A Dembek, Martin Klehr, Jochen Wirths, Veerle Visser-Vandewalle, Harald Treuer
PURPOSE: Orientating the angle of directional leads for deep brain stimulation (DBS) in an axial plane introduces a new degree of freedom that is indicated by embedded anisotropic directional markers. Our aim was to develop algorithms to determine lead orientation angles from computed tomography (CT) and stereotactic x-ray imaging using standard clinical protocols, and subsequently assess the accuracy of both methods. METHODS: In CT the anisotropic marker artifact was taken as a signature of the lead orientation angle and analyzed using discrete Fourier transform of circular intensity profiles...
June 22, 2017: Medical Physics
https://www.readbyqxmd.com/read/28611846/safety-of-allogeneic-canine-adipose-tissue-derived-mesenchymal-stem-cell-intraspinal-transplantation-in-dogs-with-chronic-spinal-cord-injury
#10
Cláudia Cardoso Maciel Escalhão, Isalira Peroba Ramos, Camila Hochman-Mendez, Tais Hanae Kasai Brunswick, Sergio Augusto Lopes Souza, Bianca Gutfilen, Regina Coeli Dos Santos Goldenberg, Tatiana Coelho-Sampaio
This is a pilot clinical study primarily designed to assess the feasibility and safety of X-ray-guided percutaneous intraspinal injection of allogeneic canine adipose tissue-derived mesenchymal stem cells in dogs with chronic spinal cord injury. Six dogs with chronic paraplegia (≥six months) were intraparenchymally injected with allogeneic cells in the site of lesion. Cells were obtained from subcutaneous adipose tissue of a healthy dog, cultured to passage 3, labeled with (99m)Technetium, and transplanted into the lesion by percutaneous X-ray-guided injection...
2017: Stem Cells International
https://www.readbyqxmd.com/read/28580826/bone-mineral-density-loss-in-clinically-suspect-arthralgia-is-associated-with-subclinical-inflammation-and-progression-to-clinical-arthritis
#11
L Mangnus, H W van Steenbergen, M Reijnierse, J Kälvesten, Ahm van der Helm-Van Mil
OBJECTIVE: Peripheral bone mineral density (BMD) may be decreased in early rheumatoid arthritis (RA) but it is unknown whether BMD loss emerges before arthritis is clinically apparent. We aimed to study whether BMD loss occurs in patients with clinically suspect arthralgia (CSA), and whether it is associated with progression to clinical arthritis and magnetic resonance imaging (MRI)-detected subclinical inflammation. METHOD: Patients with CSA had arthralgia for <1 year and were at risk of progressing to RA according to their rheumatologists...
September 2017: Scandinavian Journal of Rheumatology
https://www.readbyqxmd.com/read/28560241/single-view-geometric-calibration-for-c-arm-inverse-geometry-ct
#12
Jordan M Slagowski, David A P Dunkerley, Charles R Hatt, Michael A Speidel
Accurate and artifact-free reconstruction of tomographic images requires precise knowledge of the imaging system geometry. A projection matrix-based calibration method to enable C-arm inverse geometry CT (IGCT) is proposed. The method is evaluated for scanning-beam digital x-ray (SBDX), a C-arm mounted inverse geometry fluoroscopic technology. A helical configuration of fiducials is imaged at each gantry angle in a rotational acquisition. For each gantry angle, digital tomosynthesis is performed at multiple planes and a composite image analogous to a cone-beam projection is generated from the plane stack...
January 2017: Journal of Medical Imaging
https://www.readbyqxmd.com/read/28539166/can-secondary-osteoporosis-be-identified-when-screening-for-osteoporosis-with-digital-x-ray-radiogrammetry-initial-results-from-the-stockholm-osteoporosis-project-stop
#13
Michael L Wilczek, Johan Kälvesten, Ingrid Bergström, Ylva Pernow, Maria Sääf, Bo Freyschuss, Torkel B Brismar
OBJECTIVES: To identify causes of low age-adjusted bone mass at digital X-ray radiogrammetry (DXR) in individuals attending an osteoporosis screening program. STUDY DESIGN: In a descriptive observational cohort study, women aged 40-75 years who attended a general mammography screening program had their bone mass investigated with DXR and answered a questionnaire regarding several clinical risk factors for osteoporosis. Each month the 2% with the lowest Z-scores were selected for further clinical examination with DXA of the hip and lumbar spine and pre-defined blood tests...
July 2017: Maturitas
https://www.readbyqxmd.com/read/28527160/study-of-bone-mineral-density-bmd-in-patients-with-rheumatoid-arthritis-and-its-co-relation-with-severity-of-the-disease
#14
Liyakat Ali Gauri, Qadir Fatima, Sharanbasu Diggi, Asim Khan, Ambreen Liyakat, B R Ajay
INTRODUCTION: Rheumatoid arthritis (RA) is a chronic inflammatory disease of unknown etiology marked by a symmetric, peripheral polyarthritis.1-3 People with rheumatoid arthritis are at increased risk of osteoporosis. Hence this article intends to highlight the importance of BMD measurement in patients with RA as a tool for assessment of disease activity and severity. OBJECTIVE: To evaluate Bone Mineral Density in patients of Rheumatoid Arthritis and Co-relate it with severity of disease...
April 2017: Journal of the Association of Physicians of India
https://www.readbyqxmd.com/read/28490330/comparative-measurements-of-bone-mineral-density-and-bone-contrast-values-in-canine-femora-using-dual-energy-x-ray-absorptiometry-and-conventional-digital-radiography
#15
COMPARATIVE STUDY
K Lucas, I Nolte, V Galindo-Zamora, M Lerch, C Stukenborg-Colsman, B A Behrens, A Bouguecha, S Betancur, A Almohallami, P Wefstaedt
BACKGROUND: Aseptic loosening due to bone remodelling processes after total hip replacement is one common cause for revision surgery. In human medicine, dual-energy X-ray absorptiometry (DEXA) is the gold standard for quantitative evaluation of bone mineral density, whereas in veterinary medicine conventional radiography is used for follow-up studies. Recently, a method has been described using digital X-ray images for quantitative assessment of grey scale values of bone contrast. Therefore, the aim of the present study was to evaluate the correlation of bone mineral density (BMD) measured by DEXA with grey scale values (GV) measured in digital X-ray images (RX50, RX66) ex vivo...
May 11, 2017: BMC Veterinary Research
https://www.readbyqxmd.com/read/28439521/dynamic-electronic-collimation-method-for-3-d-catheter-tracking-on-a-scanning-beam-digital-x-ray-system
#16
David A P Dunkerley, Jordan M Slagowski, Tobias Funk, Michael A Speidel
Scanning-beam digital x-ray (SBDX) is an inverse geometry x-ray fluoroscopy system capable of tomosynthesis-based 3-D catheter tracking. This work proposes a method of dose-reduced 3-D catheter tracking using dynamic electronic collimation (DEC) of the SBDX scanning x-ray tube. This is achieved through the selective deactivation of focal spot positions not needed for the catheter tracking task. The technique was retrospectively evaluated with SBDX detector data recorded during a phantom study. DEC imaging of a catheter tip at isocenter required 340 active focal spots per frame versus 4473 spots in full field-of-view (FOV) mode...
April 2017: Journal of Medical Imaging
https://www.readbyqxmd.com/read/28438096/venous-air-embolism-an-under-recognised-entity-in-blunt-force-trauma-and-the-importance-of-radiology
#17
Marna du Plessis, Lorraine du Toit-Prinsloo
Air embolism (AE) is considered a rare event and can be either iatrogenic or traumatic. Various post-mortem methods to detect AE exist, of which radiology is preferred. The presence of air in the heart can be demonstrated using special dissection techniques where the heart is opened under water or by needle puncture from a water-filled syringe. Three cases of blunt-force head injury are presented herein, with AE being diagnosed by conventional radiography using a Lodox Statscan® full-body digital X-ray machine in all cases...
April 2017: Medicine, Science, and the Law
https://www.readbyqxmd.com/read/28430991/development-toward-high-resolution-x-ray-phase-imaging
#18
Atsushi Momose
Since the 1990s, the use of X-ray phase contrast has been extensively studied for imaging weakly absorbing objects consisting of low-Z elements such as biological soft tissues and polymers. The development of X-ray microscopy was also progressing during this time, although absorption contrast was only available. It was straightforward and important to develop phase-contrast X-ray microscopy. One characteristic in the development is that quantitative phase measurement is possible through the acquisition of phase-contrast images under a specific procedure, thanks to digital X-ray image detectors...
June 1, 2017: Microscopy
https://www.readbyqxmd.com/read/28383604/microbiological-contamination-in-digital-radiography-evaluation-at-the-radiology-clinic-of-an-educational-institution
#19
Cristiana P Malta, Naiana Nl Damasceno, Rosangela A Ribeiro, Carolina Sf Silva, Karina L Devito
The aim of this study was to evaluate the contamination rate of intra and extraoral digital X ray equipment in a dental radiology clinic at a public educational institution. Samples were collected on three different days, at two times in the day: in the morning, before attending patients, and at the end of the day, after appointment hours and before cleaning and disinfection procedures. Samples were collected from the periapical X-ray machine (tube head, positioning device, control panel and activator button), the panoramic X- ray machine (temporal support, bite block, control panel and activator button), the intraoral digital system (sensor), and the digital system computers (keyboard and mouse)...
December 2016: Acta Odontológica Latinoamericana: AOL
https://www.readbyqxmd.com/read/28274657/bone-health-of-children-with-intestinal-failure-measured-by-dual-energy-x-ray-absorptiometry-and-digital-x-ray-radiogrammetry
#20
Esther Neelis, Noortje Rijnen, Johanna Sluimer, Joanne Olieman, Dimitris Rizopoulos, René Wijnen, Edmond Rings, Barbara de Koning, Jessie Hulst
BACKGROUND & AIMS: Children with intestinal failure (IF) receiving long-term parenteral nutrition (PN) are at risk of developing low bone mineral density (BMD). Next to the dual energy X-ray absorptiometry (DXA) method, digital X-ray radiogrammetry (DXR) using the BoneXpert software has become available to obtain the Bone Health Index (BHI) in hand radiographs. In this study we 1) evaluated the prevalence of low BMD in children with IF using DXA and DXR, 2) compared DXA and DXR results, and 3) aimed to identify factors associated with low BMD...
February 21, 2017: Clinical Nutrition: Official Journal of the European Society of Parenteral and Enteral Nutrition
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