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https://www.readbyqxmd.com/read/28213667/point-of-care-testing-for-coagulation-function-coaguchek-%C3%A2-xs-system-versus-standard-laboratory-testing-in-pediatric-patients-with-normal-and-abnormal-coagulation-function
#1
Hiromi Kako, Vidya T Raman, Dmitry Tumin, Julie Rice, Joseph D Tobias
PURPOSE: Intraoperative abnormalities of coagulation function may occur for various reasons. In most scenarios, treatment is directed by laboratory parameters. Unfortunately, standard laboratory testing may take 1-2 h. The purpose of the current study was to evaluate a point-of-care testing device (CoaguChek(®) XS System) in pediatric patients. METHODS: Patients ranging in age from 2 to 18 years, undergoing posterior spinal fusion (PSF) or cardiac surgery using cardiopulmonary bypass (CPB) were eligible for inclusion...
February 17, 2017: Journal of Anesthesia
https://www.readbyqxmd.com/read/28213116/pushing-the-limits-of-ultra-high-resolution-human-brain-imaging-with-sms-epi-demonstrated-for-columnar-level-fmri
#2
David A Feinberg, An T Vu, Alexander Beckett
Encoding higher spatial resolution in simultaneous multi-slice (SMS) EPI is highly dependent on gradient performance, high density receiver coil arrays and pulse sequence optimization. We simulate gradient amplitude and slew rate determination of EPI imaging performance in terms of minimum TE, echo spacing (ES) and spatial resolution. We discuss the effects of image zooming in pulse sequences that have been used for sub-millimeter resolutions and the trade-offs in using partial Fourier and parallel imaging to reduce TE, PSF and ES...
February 14, 2017: NeuroImage
https://www.readbyqxmd.com/read/28211711/impact-of-laser-beam-speckle-structure-on-crossed-beam-energy-transfer-via-beam-deflections-and-ponderomotive-self-focusing
#3
G Raj, S Hüller
The role of laser speckle structure (hot spots) and its ponderomotive self-focusing (PSF), in crossed beam energy transfer (CBET), of smoothed laser beams is investigated in an inhomogeneous expanding plasma. Numerical simulations using the code harmony in two spatial dimensions, demonstrate how self-focusing of laser hot spots in crossed beams can significantly affect the transfer of energy from one beam to the other in addition to the stimulated Brillouin scattering (SBS) process. It is shown that for sufficiently intense laser beams, when the laser hot spots exceed the criterion for self-focusing in a plasma with flow, the angular spread of transmitted light beams increases considerably with the intensity, which arises in particular, in expanding plasma where significant beam deflection is observed...
February 3, 2017: Physical Review Letters
https://www.readbyqxmd.com/read/28208837/projections-onto-convex-sets-super-resolution-reconstruction-based-on-point-spread-function-estimation-of-low-resolution-remote-sensing-images
#4
Chong Fan, Chaoyun Wu, Grand Li, Jun Ma
To solve the problem on inaccuracy when estimating the point spread function (PSF) of the ideal original image in traditional projection onto convex set (POCS) super-resolution (SR) reconstruction, this paper presents an improved POCS SR algorithm based on PSF estimation of low-resolution (LR) remote sensing images. The proposed algorithm can improve the spatial resolution of the image and benefit agricultural crop visual interpolation. The PSF of the highresolution (HR) image is unknown in reality. Therefore, analysis of the relationship between the PSF of the HR image and the PSF of the LR image is important to estimate the PSF of the HR image by using multiple LR images...
February 13, 2017: Sensors
https://www.readbyqxmd.com/read/28205113/cardiac-pet-ct-with-rb-82-optimization-of-image-acquisition-and-reconstruction-parameters
#5
P Chilra, S Gnesin, G Allenbach, M Monteiro, J O Prior, L Vieira, J A Pires Jorge
BACKGROUND: Our aim was to characterize the influence of time-of-flight (TOF) and point spread function (PSF) recovery corrections, as well as ordered subset expectation maximization (OSEM) reconstruction parameters, in (82)Rb PET/CT quantification of myocardial blood flow (MBF) and myocardial flow reserve (MFR). Rest and stress list-mode dynamic (82)Rb PET acquisition data from 10 patients without myocardial flow defects and 10 patients with myocardial blood flow defects were reconstructed retrospectively...
December 2017: EJNMMI Physics
https://www.readbyqxmd.com/read/28188080/the-effect-of-18f-fdg-pet-image-reconstruction-algorithms-on-the-expression-of-characteristic-metabolic-brain-network-in-parkinson-s-disease
#6
Petra Tomše, Luka Jensterle, Sebastijan Rep, Marko Grmek, Katja Zaletel, David Eidelberg, Vijay Dhawan, Yilong Ma, Maja Trošt
PURPOSE: To evaluate the reproducibility of the expression of Parkinson's Disease Related Pattern (PDRP) across multiple sets of 18F-FDG-PET brain images reconstructed with different reconstruction algorithms. METHODS: 18F-FDG-PET brain imaging was performed in two independent cohorts of Parkinson's disease (PD) patients and normal controls (NC). Slovenian cohort (20 PD patients, 20 NC) was scanned with Siemens Biograph mCT camera and reconstructed using FBP, FBP+TOF, OSEM, OSEM+TOF, OSEM+PSF and OSEM+PSF+TOF...
February 7, 2017: Physica Medica: PM
https://www.readbyqxmd.com/read/28187072/predictors-of-blood-transfusion-in-posterior-lumbar-spinal-fusion-a-canadian-spine-outcome-and-research-network-csorn-study
#7
Mina W Morcos, Fan Jiang, Greg McIntosh, Michael Johnson, Sean Christie, Eugene Wai, Jean Ouellet, Chris Bailey, Henry Ahn, Jerome Paquet, Neil Manson, Charles Fisher, Raja Rampersaud, Ken Thomas, Hamilton Hall, Michael Weber
STUDY DESIGN: Retrospective cohort study. OBJECTIVE: To identify patient or procedure related predictors of postoperative blood transfusions in posterior lumbar fusion (PSF). SUMMARY OF BACKGROUND DATA: The rate of PSF surgery has increased significantly. It remains the most common surgical procedure used to stabilize the spine; however, the impact of blood loss requiring blood transfusions remains a significant concern. METHODS: Analysis of data from the Canadian Spine Outcomes and Research Network...
February 9, 2017: Spine
https://www.readbyqxmd.com/read/28186778/polymerization-induced-growth-of-microprotuberance-on-the-photocuring-coating
#8
Honghao Hou, Yanchang Gan, Jie Yin, Xuesong Jiang
Surface pattern on the nano- and microscale is of great interest due to its special optical effect, which might find potential application in optical devices such as LCD display, packaging of LED chip, and thin-film solar cell. We here developed a facile bottom-up approach to fabricate microprotuberance (MP) on surface by using curable resin via sequential photocuring at room temperature and thermal polymerization at high temperature. The curable resin is composed of random fluorinated polystyrene (PSF) as blinder and trimethylolpropane trimethacrylate (TMPTA) as cross-linker...
February 16, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/28186473/minimally-invasive-scoliosis-surgery-assisted-by-o-arm-navigation-for-lenke-type-5c-adolescent-idiopathic-scoliosis-a-comparison-with-standard-open-approach-spinal-instrumentation
#9
Weiguo Zhu, Weixiang Sun, Leilei Xu, Xu Sun, Zhen Liu, Yong Qiu, Zezhang Zhu
OBJECTIVE Recently, minimally invasive scoliosis surgery (MISS) was introduced for the correction of adult scoliosis. Multiple benefits including a good deformity correction rate and fewer complications have been demonstrated. However, few studies have reported on the use of MISS for the management of adolescent idiopathic scoliosis (AIS). The purpose of this study was to investigate the outcome of posterior MISS assisted by O-arm navigation for the correction of Lenke Type 5C AIS. METHODS The authors searched a database for all patients with AIS who had been treated with either MISS or PSF between November 2012 and January 2014...
February 10, 2017: Journal of Neurosurgery. Pediatrics
https://www.readbyqxmd.com/read/28155883/first-on-site-true-gamma-ray-imaging-spectroscopy-of-contamination-near-fukushima-plant
#10
Dai Tomono, Tetsuya Mizumoto, Atsushi Takada, Shotaro Komura, Yoshihiro Matsuoka, Yoshitaka Mizumura, Makoto Oda, Toru Tanimori
We have developed an Electron Tracking Compton Camera (ETCC), which provides a well-defined Point Spread Function (PSF) by reconstructing a direction of each gamma as a point and realizes simultaneous measurement of brightness and spectrum of MeV gamma-rays for the first time. Here, we present the results of our on-site pilot gamma-imaging-spectroscopy with ETCC at three contaminated locations in the vicinity of the Fukushima Daiichi Nuclear Power Plants in Japan in 2014. The obtained distribution of brightness (or emissivity) with remote-sensing observations is unambiguously converted into the dose distribution...
February 3, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28155870/establishment-of-imaging-spectroscopy-of-nuclear-gamma-rays-based-on-geometrical-optics
#11
Toru Tanimori, Yoshitaka Mizumura, Atsushi Takada, Shohei Miyamoto, Taito Takemura, Tetsuro Kishimoto, Shotaro Komura, Hidetoshi Kubo, Shunsuke Kurosawa, Yoshihiro Matsuoka, Kentaro Miuchi, Tetsuya Mizumoto, Yuma Nakamasu, Kiseki Nakamura, Joseph D Parker, Tatsuya Sawano, Shinya Sonoda, Dai Tomono, Kei Yoshikawa
Since the discovery of nuclear gamma-rays, its imaging has been limited to pseudo imaging, such as Compton Camera (CC) and coded mask. Pseudo imaging does not keep physical information (intensity, or brightness in Optics) along a ray, and thus is capable of no more than qualitative imaging of bright objects. To attain quantitative imaging, cameras that realize geometrical optics is essential, which would be, for nuclear MeV gammas, only possible via complete reconstruction of the Compton process. Recently we have revealed that "Electron Tracking Compton Camera" (ETCC) provides a well-defined Point Spread Function (PSF)...
February 3, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28144857/digital-pet-compliance-to-earl-accreditation-specifications
#12
Daniëlle Koopman, Maureen Groot Koerkamp, Pieter L Jager, Hester Arkies, Siert Knollema, Cornelis H Slump, Pedro G Sanches, Jorn A van Dalen
BACKGROUND: Our aim was to evaluate if a recently introduced TOF PET system with digital photon counting technology (Philips Healthcare), potentially providing an improved image quality over analogue systems, can fulfil EANM research Ltd (EARL) accreditation specifications for tumour imaging with FDG-PET/CT. FINDINGS: We have performed a phantom study on a digital TOF PET system using a NEMA NU2-2001 image quality phantom with six fillable spheres. Phantom preparation and PET/CT acquisition were performed according to the European Association of Nuclear Medicine (EANM) guidelines...
December 2017: EJNMMI Physics
https://www.readbyqxmd.com/read/28116792/synthesis-and-luminescence-properties-of-polymer-rare-earth-complexes-containing-salicylaldehyde-type-bidentate-schiff-base-ligand
#13
Dandan Zhang, Baojiao Gao, Yanbin Li
Using molecular design and polymer reactions, two types of bidentate Schiff base ligands, salicylaldehyde-aniline (SAN) and salicylaldehyde-cyclohexylamine (SCA), were synchronously synthesized and bonded onto the side chain of polysulfone (PSF), giving two bidentate Schiff base ligand-functionalized PSFs, PSF-SAN and PSF-SCA, referred to as macromolecular ligands. Following coordination reactions between the macromolecular ligands and Eu(III) and Tb(III) ions (the reaction occurred between the bonded ligands SAN or SCA and the lanthanide ion), two series of luminescent polymer-rare earth complexes, PSF-SAN-Eu(III) and PSF-SCA-Tb(III), were obtained...
January 24, 2017: Luminescence: the Journal of Biological and Chemical Luminescence
https://www.readbyqxmd.com/read/28113362/mitogen-a-framework-for-generating-3d-synthetic-time-lapse-sequences-of-cell-populations-in-fluorescence-microscopy
#14
David Svoboda, Vladimir Ulman
The proper analysis of biological microscopy images is an important and complex task. Therefore, it requires verification of all steps involved in the process, including image segmentation and tracking algorithms. It is generally better to verify algorithms with computer-generated ground truth datasets, which, compared to manually annotated data, nowadays have reached high quality and can be produced in large quantities even for 3D time-lapse image sequences. Here, we propose a novel framework, called MitoGen, which is capable of generating ground truth datasets with fully 3D time-lapse sequences of synthetic fluorescence-stained cell populations...
September 7, 2016: IEEE Transactions on Medical Imaging
https://www.readbyqxmd.com/read/28107576/non-invasive-anaesthetic-methods-for-dermatological-laser-procedures-a-systematic-review
#15
REVIEW
K Greveling, E P Prens, L Liu, M B A van Doorn
Pain is a common side-effect of dermatological laser procedures. Non-invasive anaesthetic drugs and anaesthetic procedures can be used to provide pain relief and increase patient satisfaction and treatment efficacy. However, it remains unclear which method provides the best pain relief. The objective of this systematic review was therefore to assess the efficacy and safety of non-invasive anaesthetic methods during dermatological laser procedures. A systematic literature search was conducted. Randomized and non-randomized controlled clinical trials (RCTs and CCTs) were included...
January 20, 2017: Journal of the European Academy of Dermatology and Venereology: JEADV
https://www.readbyqxmd.com/read/28102960/nine-degrees-of-freedom-flexmap-for-a-cone-beam-computed-tomography-imaging-device-with-independently-movable-source-and-detector
#16
Peter Keuschnigg, Daniel Kellner, Karl Fritscher, Andrea Zechner, Ulrich Mayer, Philipp Huber, Felix Sedlmayer, Heinz Deutschmann, Philipp Steininger
PURPOSE: Couch-mounted cone-beam computed tomography (CBCT) imaging devices with independently rotatable x-ray source and flat-panel detector arms for acquisitions of arbitrary regions of interest (ROI) have recently been introduced in image-guided radiotherapy (IGRT). This work analyzes mechanical limitations and gravity-induced effects influencing the geometric accuracy of images acquired with arbitrary angular constellations of source and detector in nonisocentric trajectories, which is considered essential for IGRT...
January 2017: Medical Physics
https://www.readbyqxmd.com/read/28099660/socioeconomic-hygienic-and-sanitation-factors-in-reducing-diarrhea-in-the-amazon
#17
Katiuscia Shirota Imada, Thiago Santos de Araújo, Pascoal Torres Muniz, Valter Lúcio de Pádua
OBJECTIVE: To analyze the contributions of the socioeconomic, hygienic, and sanitation improvements in reducing the prevalence of diarrhea in a city of the Amazon. METHODS: In this population-based cross-sectional study, we analyzed data from surveys conducted in the city of Jordão, Acre. In 2005 and 2012, these surveys evaluated, respectively, 466 and 826 children under five years old. Questionnaires were applied on the socioeconomic conditions, construction of houses, food and hygienic habits, and environmental sanitation...
December 22, 2016: Revista de Saúde Pública
https://www.readbyqxmd.com/read/28092274/power-profiles-and-in-vitro-optical-quality-of-scleral-contact-lenses-effect-of-the-aperture-and-power
#18
Alberto Domínguez-Vicent, Jose Juan Esteve-Taboada, Alberto Recchioni
OBJECTIVE: To assess the power profile and in vitro optical quality of scleral contact lenses with different powers as a function of the optical aperture. METHODS: The mini and semiscleral contact lenses (Procornea) were measured for five powers per design. The NIMO TR-1504 (Lambda-X) was used to assess the power profile and Zernike coefficients of each contact lens. Ten measurements per lens were taken at 3- and 6-mm apertures. Furthermore, the optical quality of each lens was described in Zernike coefficients, modulation transfer function, and point spread function (PSF)...
January 13, 2017: Eye & Contact Lens
https://www.readbyqxmd.com/read/28091957/point-spread-function-reconstructed-pet-images-of-sub-centimeter-lesions-are-not-quantitative
#19
O L Munk, L P Tolbod, S B Hansen, T V Bogsrud
BACKGROUND: PET image reconstruction methods include modeling of resolution degrading phenomena, often referred to as point-spread function (PSF) reconstruction. The aim of this study was to develop a clinically relevant phantom and characterize the reproducibility and accuracy of high-resolution PSF reconstructed images of small lesions, which is a prerequisite for using PET in the prediction and evaluation of responses to treatment. Sets of small homogeneous (18)F-spheres (range 3-12 mm diameter, relevant for small lesions and lymph nodes) were suspended and covered by a (11)C-silicone, which provided a scattering medium and a varying sphere-to-background ratio...
December 2017: EJNMMI Physics
https://www.readbyqxmd.com/read/28087232/comparison-of-medial-malleolar-fracture-healing-at-8%C3%A2-weeks-after-open-reduction-internal-fixation-versus-percutaneous-fixation-a%C3%A2-retrospective-cohort-study
#20
Glenn M Weinraub, Patrick Levine, Eric Shi, Aarron Flowers
Unstable medial malleolar fractures are treated with either standard open reduction internal fixation (ORIF) or a percutaneous approach. The percutaneous approach avoids the potentially excessive soft tissue dissection associated with an open approach but can also result in inadequate anatomic reduction. No studies have compared the incidence of radiographic healing of medial malleolar fractures between an open approach and percutaneous fixation. A retrospective comparative study was performed at a single institution across multiple sites...
January 10, 2017: Journal of Foot and Ankle Surgery: Official Publication of the American College of Foot and Ankle Surgeons
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