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https://www.readbyqxmd.com/read/27779136/petpvc-a-toolbox-for-performing-partial-volume-correction-techniques-in-positron-emission-tomography
#1
Benjamin A Thomas, Vesna Cuplov, Alexandre Bousse, Adriana Mendes, Kris Thielemans, Brian F Hutton, Kjell Erlandsson
Positron emission tomography (PET) images are degraded by a phenomenon known as the partial volume effect (PVE). Approaches have been developed to reduce PVEs, typically through the utilisation of structural information provided by other imaging modalities such as MRI or CT. These methods, known as partial volume correction (PVC) techniques, reduce PVEs by compensating for the effects of the scanner resolution, thereby improving the quantitative accuracy. The PETPVC toolbox described in this paper comprises a suite of methods, both classic and more recent approaches, for the purposes of applying PVC to PET data...
November 21, 2016: Physics in Medicine and Biology
https://www.readbyqxmd.com/read/27725826/hybrid-artificial-root-foraging-optimizer-based-multilevel-threshold-for-image-segmentation
#2
Yang Liu, Junfei Liu, Liwei Tian, Lianbo Ma
This paper proposes a new plant-inspired optimization algorithm for multilevel threshold image segmentation, namely, hybrid artificial root foraging optimizer (HARFO), which essentially mimics the iterative root foraging behaviors. In this algorithm the new growth operators of branching, regrowing, and shrinkage are initially designed to optimize continuous space search by combining root-to-root communication and coevolution mechanism. With the auxin-regulated scheme, various root growth operators are guided systematically...
2016: Computational Intelligence and Neuroscience
https://www.readbyqxmd.com/read/27602911/angiographic-embolization-for-hemorrhage-following-pelvic-fracture-is-it-time-for-a-paradigm-shift
#3
Ronald Tesoriero, Brandon Bruns, Mayur Narayan, Joseph Dubose, Sundeep Guliani, Megan Brenner, Sharon Boswell, Deborah M Stein, Thomas Scalea
INTRODUCTION: Major pelvic disruption with hemorrhage has a high rate of lethality. Angiographic embolization remains the mainstay of treatment. Delays to angiography have been shown to worsen outcomes, in part because time spent awaiting mobilization of resources needed to perform angiography allows ongoing hemorrhage. Alternative techniques like pelvic pre-peritoneal packing (PPP) and aortic balloon occlusion (REBOA) now exist. We hypothesized that time to angiographic embolization at our level 1 trauma center would be longer than 90 minutes...
September 16, 2016: Journal of Trauma and Acute Care Surgery
https://www.readbyqxmd.com/read/27505382/degradation-nonuniformity-in-the-solar-diffuser-bidirectional-reflectance-distribution-function
#4
Junqiang Sun, Mike Chu, Menghua Wang
The assumption of angular dependence stability of the solar diffuser (SD) throughout degradation is critical to the on-orbit calibration of the reflective solar bands (RSBs) in many satellite sensors. Recent evidence has pointed to the contrary, and in this work, we present a thorough investigative effort into the angular dependence of the SD degradation for the Visible Infrared Imaging Radiometer Suite (VIIRS) onboard the Suomi National Polar-orbiting Partnership (SNPP) satellite and for the twin Moderate-resolution Imaging Spectroradiometer (MODIS) onboard Terra and Aqua spacecrafts...
August 1, 2016: Applied Optics
https://www.readbyqxmd.com/read/27495341/superselective-intra-arterial-hepatic-injection-of-indocyanine-green-icg-for-fluorescence-image-guided-segmental-positive-staining-experimental-proof-of-the-concept
#5
Michele Diana, Yu-Yin Liu, Raoul Pop, Seong-Ho Kong, Andras Legnèr, Remy Beaujeux, Patrick Pessaux, Luc Soler, Didier Mutter, Bernard Dallemagne, Jacques Marescaux
BACKGROUND: Intraoperative liver segmentation can be obtained by means of percutaneous intra-portal injection of a fluorophore and illumination with a near-infrared light source. However, the percutaneous approach is challenging in the minimally invasive setting. We aimed to evaluate the feasibility of fluorescence liver segmentation by superselective intra-hepatic arterial injection of indocyanine green (ICG). MATERIALS AND METHODS: Eight pigs (mean weight: 26...
August 5, 2016: Surgical Endoscopy
https://www.readbyqxmd.com/read/27494822/endoscope-assisted-transsphenoidal-puncture-of-the-cavernous-sinus-for-embolization-of-carotid-cavernous-fistula-in-a-neurosurgical-hybrid-operating-suite
#6
Chien-Lun Tang, Chih-Hsiang Liao, Wen-Hsien Chen, Shih-Chieh Shen, Chung-Hsin Lee, Hsu-Tung Lee, Yuang-Seng Tsuei
Endovascular embolization is the treatment of choice for carotid-cavernous fistulas (CCFs), but failure to catheterize the cavernous sinus may occur as a result of vessel tortuosity, hypoplasia, or stenosis. In addition to conventional transvenous or transarterial routes, alternative approaches should be considered. The authors present a case in which a straightforward route to the CCF was accessed via transsphenoidal puncture of the cavernous sinus in a neurosurgical hybrid operating suite. This 82-year-old man presented with severe chemosis and proptosis of the right eye...
August 5, 2016: Journal of Neurosurgery
https://www.readbyqxmd.com/read/27486345/computed-tomography-and-magnetic-resonance-imaging-contrast-media-injectors-technical-feature-review-what-is-really-needed
#7
REVIEW
Michael Friebe
There has been little technical innovation over the last few years for contrast media (CM) injectors that are used for diagnostic imaging (computed tomography [CT], magnetic resonance imaging [MRI], and hybrid imaging systems, such as positron emission tomography-CT or magnetic resonance-positron emission tomography) examinations. The medical need of CM for the enhancement of diagnostic images has been around for a long time, but the application of the CM into the blood stream comes with potential medical complications for the patient and requires a lot of operator experience and training...
2016: Medical Devices: Evidence and Research
https://www.readbyqxmd.com/read/27464941/a-novel-and-multidisciplinary-strategy-for-cesarean-delivery-with-placenta-percreta-intraoperative-embolization-in-a-hybrid-suite
#8
Yasutaka Konishi, Satoshi Yamamoto, Kei Sugiki, Hidetoshi Sakamoto, Shigehito Sawamura
Cesarean deliveries in patients with placenta accreta often are accompanied by life-threatening bleeding and sometimes death. A novel, multidisciplinary approach that uses uterine embolization after cesarean delivery recently has been advocated; however, embolization in the radiology department requires transfer of postoperative patients, which could increase maternal mortality and morbidity. In a case of severe placenta accreta, we planned a stepwise treatment, including cesarean delivery without separation of the placenta followed by intraoperative uterine arterial embolization in a hybrid operating room, followed by hysterectomy a few weeks after cesarean delivery...
September 15, 2016: A & A Case Reports
https://www.readbyqxmd.com/read/27301836/managing-disruptions-to-patient-flow-capacity-rapid-cycle-improvement-in-a-pediatric-cardiac-procedure-complex
#9
Debbie McKetta, T Eugene Day, Virginia Jones, Alexis Perri, Susan C Nicolson
BACKGROUND: Managing service disruptions is a challenge in every health care environment. Discrete event simulation (DES)--a computer modeling tool used to build in silico (that is, in a digital computer) testbeds for potential changes in complex systems--has been deployed in health care for research and quality improvement (QI), specifically in surgical suite management. A strategy for managing a 6-week planned service disruption needed to be enacted 12 weeks after the announcement, in late October 2014, of the closure of the Hybrid Suite (operating room/catheterization laboratory) for renovation, at The Children's Hospital of Philadelphia's Cardiac Center's Cardiac Operative and Imaging Complex (COIC)...
July 2016: Joint Commission Journal on Quality and Patient Safety
https://www.readbyqxmd.com/read/27020979/refinement-of-the-hybrid-neuroendovascular-operating-suite-current-and-future-applications
#10
Ramsey Ashour, Alfred P See, Hormuzdiyar H Dasenbrock, Priyank Khandelwal, Nirav J Patel, Bianca Belcher, Mohammad Ali Aziz-Sultan
OBJECTIVE: In early-generation hybrid biplane endovascular operating rooms, switching from surgical to angiographic position is cumbersome. In this report, we highlight the unique design of a new hybrid neuroendovascular operating suite that allows surgical access to the head while keeping the biplane system over the lower body of the patient. Current and future hybrid neuroendovascular operating suite applications are discussed. METHODS: We collaborated with engineers to implement the following modifications to the design of the angiographic system: translation of the bed toward the feet to allow biplane cerebral imaging in the head-side position and the biplane left-side position; translation of the base of the A-plane C-arm away from the feet to allow increased operator space at the head of the bed and to allow cerebral imaging in both the head-side and left-side positions; use of a specialized boom mount for the display panel to increase mobility; and use of a radiolucent tabletop with attachments for the headrest or radiolucent head clamp system...
July 2016: World Neurosurgery
https://www.readbyqxmd.com/read/26854411/self-assembled-nio-ni-oh-2-nanoflakes-as-active-material-for-high-power-and-high-energy-hybrid-rechargeable-battery
#11
Dong Un Lee, Jing Fu, Moon Gyu Park, Hao Liu, Ali Ghorbani Kashkooli, Zhongwei Chen
Herein, a proof-of-concept of novel hybrid rechargeable battery based on electrochemical reactions of both nickel-zinc and zinc-air batteries is demonstrated using NiO/Ni(OH)2 nanoflakes self-assembled into mesoporous spheres as the active electrode material. The hybrid battery operates on two sets of fundamentally different battery reactions combined at the cell level, unlike in other hybrid systems where batteries of different reactions are simply connected through an external circuitry. As a result of combining nickel-zinc and zinc-air reactions, the hybrid battery demonstrates both remarkably high power density (volumetric, 14 000 W L(-1); gravimetric, 2700 W kg(-1)) and energy density of 980 W h kg(-1), significantly outperforming the performances of a conventional zinc-air battery...
March 9, 2016: Nano Letters
https://www.readbyqxmd.com/read/26844304/surpassing-humans-and-computers-with-jellybean-crowd-vision-hybrid-counting-algorithms
#12
Akash Das Sarma, Ayush Jain, Arnab Nandi, Aditya Parameswaran, Jennifer Widom
Counting objects is a fundamental image processisng primitive, and has many scientific, health, surveillance, security, and military applications. Existing supervised computer vision techniques typically require large quantities of labeled training data, and even with that, fail to return accurate results in all but the most stylized settings. Using vanilla crowd-sourcing, on the other hand, can lead to significant errors, especially on images with many objects. In this paper, we present our JellyBean suite of algorithms, that combines the best of crowds and computer vision to count objects in images, and uses judicious decomposition of images to greatly improve accuracy at low cost...
November 2015: Proceedings of the ... AAAI Conference on Human Computation and Crowdsourcing
https://www.readbyqxmd.com/read/26763260/alluraclarity-radiation-dose-reduction-technology-in-the-hybrid-operating-room-during-endovascular-aneurysm-repair
#13
Quirina M B de Ruiter, Frans L Moll, Crystel M Gijsberts, Joost A van Herwaarden
PURPOSE: To evaluate the effect of radiation dose reduction with the Allura ClarityIQ image processing technology for fixed C-arms in comparison with a mobile C-arm and an Allura fixed C-arm without ClarityIQ technology during endovascular aneurysm repair (EVAR) procedures. METHODS: Radiation dose data from 85 patients (mean age 74.2±7.8 years; 68 men) undergoing EVAR with mobile and fixed C-arm fluoroscopy were retrospectively analyzed. The radiation dose parameters included the kerma area product (KAP), fluoroscopic time (FT), and number of digital subtraction angiography (DSA) frames (FrDSA)...
February 2016: Journal of Endovascular Therapy
https://www.readbyqxmd.com/read/26713967/the-potential-benefit-of-a-hybrid-operating-environment-among-severely-injured-patients-with-persistent-hemorrhage-how-often-could-we-get-it-right
#14
Adam Fehr, Julie Beveridge, Scott D DʼAmours, Andrew W Kirkpatrick, Chad G Ball
BACKGROUND: Selecting the appropriate initial destination (operating theater [OR], angiography suite, or intensive care unit [ICU]) in persistently hypotensive injured patients can be extremely challenging. The purpose of this study was to define the flow, interventions, and outcomes of these patients. METHODS: All persistently hypotensive (two or more systolic blood pressures < 90 mmHg) severely injured (Injury Severity Score [ISS] ≥ 12) adult patients (1995-2012) were analyzed over the first 24 hours at a Level I trauma referral center...
March 2016: Journal of Trauma and Acute Care Surgery
https://www.readbyqxmd.com/read/26605576/computing-the-density-matrix-in-electronic-structure-theory-on-graphics-processing-units
#15
M J Cawkwell, E J Sanville, S M Mniszewski, Anders M N Niklasson
The self-consistent solution of a Schrödinger-like equation for the density matrix is a critical and computationally demanding step in quantum-based models of interatomic bonding. This step was tackled historically via the diagonalization of the Hamiltonian. We have investigated the performance and accuracy of the second-order spectral projection (SP2) algorithm for the computation of the density matrix via a recursive expansion of the Fermi operator in a series of generalized matrix-matrix multiplications...
November 13, 2012: Journal of Chemical Theory and Computation
https://www.readbyqxmd.com/read/26508437/hybrid-treatment-combining-emergency-surgery-and-intraoperative-interventional-radiology-for-severe-trauma
#16
Yuichi Kataoka, Hiroaki Minehara, Fumie Kashimi, Tasuku Hanajima, Tatsuhiro Yamaya, Hiroshi Nishimaki, Yasushi Asari
OBJECT: To evaluate the efficacy of hybrid treatment combining emergency surgery and intraoperative interventional radiology (IVR) for severe trauma. PATIENTS AND METHODS: The records of 63 severely injured patients who underwent concurrent emergency surgery and IVR at our emergency centre from 1999 through 2013 were retrospectively reviewed. Mobile digital subtraction angiography device was used in the operating room when performing IVR. Patients undergoing hybrid treatment combining intraoperative IVR and emergency surgery (intraoperative IVR group) were compared with those undergoing IVR in the angiography suite before or after emergency surgery (control group)...
January 2016: Injury
https://www.readbyqxmd.com/read/26369151/time-resolved-spectroscopic-studies-on-a-novel-synthesized-photo-switchable-organic-dyad-and-its-nanocomposite-form-in-order-to-develop-light-energy-conversion-devices
#17
Gopa Dutta Pal, Abhijit Paul, Somnath Yadav, Munmun Bardhan, Asish De, Joydeep Chowdhury, Aindrila Jana, Tapan Ganguly
UV-vis absorption, steady state and time resolved spectroscopic investigations in pico and nanosecond time domain were made in the different environments on a novel synthesized dyad, 3-(2-methoxynaphthalen-1-yl)-1-(4-methoxyphenyl)prop-2-en-1-one (MNTMA) in its pristine form and when combined with gold (Au) nanoparticles i.e., in its nanocomposite structure. Both steady state and time resolved measurements coupled with the DFT calculations performed by using Gaussian 03 suit of software operated in the linux operating system show that though the dyad exhibits mainly the folded conformation in the ground state but on photoexcitation the nanocomposite form of dyad prefers to be in elongated structure in the excited state indicating its photoswitchable nature...
August 2015: Journal of Nanoscience and Nanotechnology
https://www.readbyqxmd.com/read/26361342/high-temperature-continuous-flow-synthesis-of-cdse-cds-zns-cds-zns-and-cdses-zns-nanocrystals
#18
Matt S Naughton, Vivek Kumar, Yolanda Bonita, Kishori Deshpande, Paul J A Kenis
Continuous flow reactors show great promise for large-scale synthesis of quantum dots. Here, we discuss results for the synthesis of multi-layered Cd-based hybrid nanocrystals - CdSe/CdS/ZnS, CdS/ZnS, and CdSeS/ZnS - in a continuous flow reactor. The simple reactor design and liquid-phase chemistry obviate the need for preheating or in-line mixing, and the chosen reactor dimensions and operating conditions allow for high flow rates (∼10 mL min(-1)). Additionally, the simple reactor design is well suited for scale-up...
October 14, 2015: Nanoscale
https://www.readbyqxmd.com/read/26356925/panoramicdata-data-analysis-through-pen-touch
#19
Emanuel Zgraggen, Robert Zeleznik, Steven M Drucker
Interactively exploring multidimensional datasets requires frequent switching among a range of distinct but inter-related tasks (e.g., producing different visuals based on different column sets, calculating new variables, and observing the interactions between sets of data). Existing approaches either target specific different problem domains (e.g., data-transformation or data-presentation) or expose only limited aspects of the general exploratory process; in either case, users are forced to adopt coping strategies (e...
December 2014: IEEE Transactions on Visualization and Computer Graphics
https://www.readbyqxmd.com/read/26356307/amine-oxide-hybrid-materials-for-co2-capture-from-ambient-air
#20
Stephanie A Didas, Sunho Choi, Watcharop Chaikittisilp, Christopher W Jones
Oxide supports functionalized with amine moieties have been used for decades as catalysts and chromatographic media. Owing to the recognized impact of atmospheric CO2 on global climate change, the study of the use of amine-oxide hybrid materials as CO2 sorbents has exploded in the past decade. While the majority of the work has concerned separation of CO2 from dilute mixtures such as flue gas from coal-fired power plants, it has been recognized by us and others that such supported amine materials are also perhaps uniquely suited to extract CO2 from ultradilute gas mixtures, such as ambient air...
October 20, 2015: Accounts of Chemical Research
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