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https://www.readbyqxmd.com/read/28070676/-upper-extremity-fractures-in-the-elderly
#1
Roland Biber, S Grüninger, H J Bail
Upper extremity fractures in the elderly are very frequent and second only to hip fractures in the group of fragility fractures. Their impact on mobility and functional decline seems to be underestimated especially when they occur in combination with lower extremity fractures. Fractures of the proximal humerus and the distal radius can often be treated conservatively; however, the indications for operative treatment must not be based on fracture morphology alone and due consideration should be given to all concomitant circumstances affecting functional aspects of patients...
January 9, 2017: Zeitschrift Für Gerontologie und Geriatrie
https://www.readbyqxmd.com/read/28066887/the-effect-of-beam-purity-and-scanner-complexity-on-proton-ct-accuracy
#2
P Piersimoni, J Ramos-Méndez, T Geoghegan, V A Bashkirov, R W Schulte, B A Faddegon
PURPOSE: To determine the dependence of the accuracy in reconstruction of relative stopping power (RSP) with proton computerized tomography (pCT) scans on the purity of the proton beam and the technological complexity of the pCT scanner using standard phantoms and a digital representation of a pediatric patient. METHODS: The Monte Carlo method was applied to simulate the pCT scanner, using both a pure proton beam (uniform 200 MeV mono-energetic, parallel beam) and the Northwestern Medicine Chicago Proton Center (NMCPC) clinical beam in uniform scanning mode...
November 22, 2016: Medical Physics
https://www.readbyqxmd.com/read/28064003/a-semi-automated-quantitative-ct-method-for-measuring-rotator-cuff-muscle-degeneration-in-shoulders-with-primary-osteoarthritis
#3
Alexandre Terrier, Julien Ston, Antoine Dewarrat, Fabio Becce, Alain Farron
BACKGROUND: Rotator cuff muscle degeneration is an important parameter to consider when planning shoulder arthroplasty. HYPOTHESIS: We hypothesized that rotator cuff muscle degeneration is correlated with scapulohumeral subluxation in patients planned for anatomical total shoulder arthroplasty (TSA). MATERIALS AND METHODS: We developed a semi-automated quantitative CT method to measure rotator cuff muscle degeneration, and retrospectively analyzed 107 preoperative shoulder CT scans of patients with primary osteoarthritis...
January 4, 2017: Orthopaedics & Traumatology, Surgery & Research: OTSR
https://www.readbyqxmd.com/read/28048763/su-g-brc-10-feasibility-of-a-web-based-monte-carlo-simulation-tool-for-dynamic-electron-arc-radiotherapy-dear
#4
A Rodrigues, D Sawkey, Q Wu
PURPOSE: DEAR is a radiation therapy technique utilizing synchronized motion of gantry and couch during delivery to optimize dose distribution homogeneity and penumbra for treatment of superficial disease. Dose calculation for DEAR is not yet supported by commercial TPSs. The purpose of this study is to demonstrate the feasibility of using a web-based Monte Carlo (MC) simulation tool (VirtuaLinac) to calculate dose distributions for a DEAR delivery. METHODS: MC simulations were run through VirtuaLinac, which is based on the GEANT4 platform...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28048001/su-f-t-66-characteristics-of-electron-beams-from-varian-trubeam
#5
A Dimofte, C Kennedy, T Zhu
PURPOSE: The purpose of this study was to compare the electron beam data between Truebeam and 2300ix Varian accelerators for percent depth dose for broad beam and small circular cutouts, cone factors, head scatter factor as a function of cone size and SSD, phantom scatter factor, blocking factor, distance factor and virtual source position. METHODS: Measurements were performed for Truebeam and 2300ix Varian accelerators. The main energies used were: 6, 9, 12, 16 and 20 MeV...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28047762/su-f-t-496-an-investigation-of-two-novel-devices-for-testing-linac-clearance-during-ct-simulation
#6
A Morrow, B Massingill
PURPOSE: This work's objective is to determine the efficacy of two newly patented devices termed the Mor-O rings, Mark1 and Mark2, developed to predict collisions between the patient and a linac at the time of CT simulation. METHODS: Mark1: A ring with an inner radius equal to the distance between the isocenter and the nearest portion of a linac head(diso) was made. This is mounted to a stand that allows vertical repositioning. The ring is placed around the patient on the CT table and aligned with isocenter...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28046821/su-g-201-07-dosimetric-verification-of-a-3d-printed-hdr-skin-brachytherapy-applicator
#7
K Rasmussen, A Baumgarten, D Stanley, C Pelletier, M Corbett, J Jung, Y Feng, Z Huang, A Ju, T Eng, N Kirby, A Gutierrez, S Stathakis, N Papanikolaou
PURPOSE: The use of radiation as a treatment modality for skin cancer has increased significantly over the last decade with standardized applicators. Utilizing 3D printing, the ability to make applicators specifically designed for each patient's anatomy has become economically feasible. With this in mind it was the aim of this study to determine the dosimetric accuracy of a 3-D printed HDR brachytherapy applicator for the skin. METHODS: A CT reference image was used to generate a custom applicator based on an anthropomorphic head and neck phantom...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28046621/su-f-t-287-a-preliminary-study-on-patient-specific-vmat-verification-using-a-phosphor-screen-based-geometric-qa-system-raven-qa
#8
M Lee, J Wong, K Ding, B Yi
PURPOSE: The RavenQA system (LAP Laser, Germany) is a QA device with a phosphor screen detector for performing the QA tasks of TG-142. This study tested if it is feasible to use the system for the patient specific QA of the Volumetric Modulated Arc Therapy (VMAT). METHODS: Water equivalent material (5cm) is attached to the front of the detector plate of the RavenQA for dosimetry purpose. Then the plate is attached to the gantry to synchronize the movement between the detector and the gantry...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28045906/classification-of-animal-movement-behavior-through-residence-in-space-and-time
#9
Leigh G Torres, Rachael A Orben, Irina Tolkova, David R Thompson
Identification and classification of behavior states in animal movement data can be complex, temporally biased, time-intensive, scale-dependent, and unstandardized across studies and taxa. Large movement datasets are increasingly common and there is a need for efficient methods of data exploration that adjust to the individual variability of each track. We present the Residence in Space and Time (RST) method to classify behavior patterns in movement data based on the concept that behavior states can be partitioned by the amount of space and time occupied in an area of constant scale...
2017: PloS One
https://www.readbyqxmd.com/read/28040075/results-of-geriatric-distal-radius-fractures-treated-by-intramedullary-fixation
#10
Steffi S I Falk, Thomas Mittlmeier, Georg Gradl
INTRODUCTION: Distal radius fracture are common injuries but no gold standard for their therapy exists. The aim of this study was to evaluate the quality of fracture care in distal radius fractures using an intramedullary implant (Targon DR interlocking nail). The nail had been developed to minimize the surgical exposure, increase fixation strength, to prevent tendon irritations and to allow for a fast return to activity. PATIENTS AND METHODS: Prospective study reports the result of 43 patients with an age over 70 years (range 70-91 years) treated by closed reduction and intramedullary fixation...
December 2016: Injury
https://www.readbyqxmd.com/read/28018072/distal-radius-fracture-with-associated-ulnar-head-fracture
#11
Naser Fuaz, Samer Mackuli, Ronit Wollstein
Ulnar head and neck fractures are rare and the mechanism of injury is not always clear. We describe a case of a distal radioulnar joint (DRUJ) fracture dislocation. The fracture included a distal radius fracture with a vertical ulnar head fracture that was treated with open reduction and internal fixation with a headless screw. We describe the mechanism of injury and approach to the treatment of this injury.
October 2016: Journal of Clinical Orthopaedics and Trauma
https://www.readbyqxmd.com/read/28002370/distinct-proximal-humeral-geometry-in-chinese-population-and-clinical-relevance
#12
Qiang Zhang, Lewis L Shi, Krishna C Ravella, Jason L Koh, Shaobai Wang, Cailong Liu, Guoan Li, Jianhua Wang
BACKGROUND: Replicating humeral anatomy during shoulder arthroplasty is important for good patient outcomes. The proximal humeral geometry of the Chinese population has been rarely reported. We analyzed the geometry of the proximal part of the humerus in Chinese subjects and compared it with that of Western populations and the dimensions of available prostheses. METHODS: Eighty healthy Chinese subjects underwent computed tomography (CT)-arthrography. Three-dimensional (3D) digital humeral and glenoid models were reconstructed, and geometric parameters were measured...
December 21, 2016: Journal of Bone and Joint Surgery. American Volume
https://www.readbyqxmd.com/read/27993017/pore-model-in-the-melting-regime-of-a-lyotropic-biomembrane-with-an-anionic-phospholipid
#13
Francesco Spinozzi, Lia Q Amaral
Aqueous dispersions of the anionic phospholipid dimyristoyl phosphatidyl glycerol (DMPG) exhibit an unusual "melting regime", at the phase transition between the ordered (gel) and the disordered (fluid liquid crystal) state of hydrocarbon chains, depending on the ionic strength and DMPG concentration, previously attributed to the pore formation. Dispersions with 150 mM DMPG present a lamellar phase above 23 °C, within the melting regime. In this study, we present a detailed pore model for the analysis of small-angle X-ray scattering (SAXS) results and their variation with temperature, focused on the surface fractions of pores in the bilayers...
December 20, 2016: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/27967123/head-on-collision-of-dust-acoustic-solitons-in-a-nonextensive-plasma-with-variable-size-dust-grains-of-arbitrary-charge
#14
E E Behery
The head-on collision of two dust acoustic solitons (DASs) in a nonextensive plasma with positive or negative dust grains fluid including the effect of dust size distribution (DSD) is studied. The phase shifts for the two solitons due to the collision are derived by applying the extended Poincaré-Lighthill-Kuo (PLK) method. The influences of the power law DSD and the nonextensivity of plasma particles on the characteristic properties of the head-on collision of DASs are analyzed. It is found that the phase shifts can vanish, only for the case of positive dust grains, for certain values and ranges of the dust grain radius and the entropic index of ions (q_{i})...
November 2016: Physical Review. E
https://www.readbyqxmd.com/read/27929490/rounded-leaf-end-modeling-in-pinnacle-vmat-treatment-planning-for-fixed-jaw-linacs
#15
Lori A Young, Fei Yang, Ning Cao, Juergen Meyer
During volume-modulated arc therapies (VMAT), dosimetric errors are introduced by multiple open dynamic leaf gaps that are present in fixed diaphragm linear accelerators. The purpose of this work was to develop a methodology for adjusting the rounded leaf end modeling parameters to improve out-of-field dose agreement in SmartArc VMAT treatment plans delivered by fixed jaw linacs where leaf gap dose is not negligible. Leaf gap doses were measured for an Elekta beam modulator linac with 0.4 cm micro-multileaf collimators (MLC) using an A16 micro-ionization chamber, a MatriXX ion chamber detector array, and Kodak EDR2 film dosimetry in a solid water phantom...
November 8, 2016: Journal of Applied Clinical Medical Physics
https://www.readbyqxmd.com/read/27925591/kinesthetic-feedback-during-2dof-wrist-movements-via-a-novel-mr-compatible-robot
#16
Andrew Erwin, Marcia O'Malley, David Ress, Fabrizio Sergi
We demonstrate the interaction control capabilities of the MR-SoftWrist, a novel MR-compatible robot capable of applying accurate kinesthetic feedback to wrist pointing movements executed during fMRI. The MR-SoftWrist, based on a novel design that combines parallel piezoelectric actuation with compliant force feedback, is capable of delivering 1.5 N·m of torque to the wrist of an interacting subject about the flexion/extension and radial/ulnar axes. The robot workspace, defined by admissible wrist rotation angles, fully includes a circle with a 20 deg radius...
December 1, 2016: IEEE Transactions on Neural Systems and Rehabilitation Engineering
https://www.readbyqxmd.com/read/27916917/a-routing-protocol-for-multisink-wireless-sensor-networks-in-underground-coalmine-tunnels
#17
Xu Xia, Zhigang Chen, Hui Liu, Huihui Wang, Feng Zeng
Traditional underground coalmine monitoring systems are mainly based on the use of wired transmission. However, when cables are damaged during an accident, it is difficult to obtain relevant data on environmental parameters and the emergency situation underground. To address this problem, the use of wireless sensor networks (WSNs) has been proposed. However, the shape of coalmine tunnels is not conducive to the deployment of WSNs as they are long and narrow. Therefore, issues with the network arise, such as extremely large energy consumption, very weak connectivity, long time delays, and a short lifetime...
November 30, 2016: Sensors
https://www.readbyqxmd.com/read/27908172/design-of-a-dual-resolution-collimator-for-preclinical-cardiac-spect-with-a-stationary-triple-detector-system
#18
Stephen C Moore, Mi-Ae Park, Zhe Liu, Morgan C Lyon, Lindsay C Johnson, Victor H Lushear, James G Westberg, Scott D Metzler
PURPOSE: One approach to preclinical single-photon emission computed tomography (SPECT) imaging that provides both high resolution and high sensitivity is based on imaging a mouse inside a collimating tube; many magnified pinhole projection images from a small target region, e.g., the heart, can be recorded simultaneously on multiple detectors with little multiplexing since each pinhole aperture's opening angle is restricted to view mostly the target organ. However, to obtain complete data for reconstruction, it may be necessary to scan the mouse through the target region of the tube...
December 2016: Medical Physics
https://www.readbyqxmd.com/read/27902691/do-vascular-networks-branch-optimally-or-randomly-across-spatial-scales
#19
Elif Tekin, David Hunt, Mitchell G Newberry, Van M Savage
Modern models that derive allometric relationships between metabolic rate and body mass are based on the architectural design of the cardiovascular system and presume sibling vessels are symmetric in terms of radius, length, flow rate, and pressure. Here, we study the cardiovascular structure of the human head and torso and of a mouse lung based on three-dimensional images processed via our software Angicart. In contrast to modern allometric theories, we find systematic patterns of asymmetry in vascular branching, potentially explaining previously documented mismatches between predictions (power-law or concave curvature) and observed empirical data (convex curvature) for the allometric scaling of metabolic rate...
November 2016: PLoS Computational Biology
https://www.readbyqxmd.com/read/27890215/-incidence-of-distal-ulna-fractures-associated-with-distal-radius-fractures-treatment-options
#20
G Herzberg, T Castel
Fractures of the neck and/or head of the ulna or distal ulna fracture (DUF) other than ulnar styloid fractures can occur in combination with distal radius fractures (DRF). This combination can have a significant influence on the treatment and prognosis since it causes the entire distal forearm to be unstable. In a series of 1279 consecutive unilateral DRFs, we found an associated ulnar neck fracture in 5.9% of cases, ulnar head and neck fracture in 1.6%, and isolated ulnar head fracture in 1.4%. Overall, 9% of cases in this study had a DUF with a DRF...
December 2016: Hand Surgery and Rehabilitation
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