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https://www.readbyqxmd.com/read/29340867/photoluminescent-and-thermoluminescent-studies-of-dy3-and-eu3-doped-y2o3-phosphors
#1
Tarkeshwari Verma, Sadhana Agrawal
Eu3+ doped and Dy3+ codoped yttrium oxide (Y2O3) phosphors have been prepared using solid-state reaction technique (SSR). The prepared phosphors were characterized by X-ray diffractometer (XRD), energy dispersive X-ray (EDX) spectroscopy, scanning electron microscopy (SEM) and Fourier transforms infrared spectroscopy (FTIR) techniques. Photoluminescence (PL) and Thermoluminescence (TL) properties were studied in detail. PL emission spectra were recorded for prepared phosphors under excitation wavelength 254 nm, which show a high intense peak at 613 nm for Y2O3:Dy3+, Eu3+ (1:1...
January 16, 2018: Journal of Fluorescence
https://www.readbyqxmd.com/read/29337299/comparison-of-acrylic-polymer-adhesive-tapes-and-silicone-optical-grease-in-light-sharing-detectors-for-positron-emission-tomography
#2
Devin John Van Elburg, Scott D Noble, Simone Hagey, Andrew L Goertzen
Optical coupling is an important factor in detector design as it improves optical photon transmission by mitigating internal reflections at light-sharing boundaries. In this work we compare optical coupling materials, namely double-sided acrylic polymer tapes and silicone optical grease (SiG), in the context of positron emission tomography (PET). Four double-sided tapes from 3M of varying thicknesses (0.229mm-1.016mm) and adhesive materials ('100MP', adhesive 100 'A100', 'VHB') were characterized with spectrophotometer measurements and photopeak amplitude and energy resolution measurements using lutetium-yttrium oxy-orthosilicate (LYSO) coupled to photomultiplier tubes (PMT) or silicon photomultipliers (SiPMs)...
January 16, 2018: Physics in Medicine and Biology
https://www.readbyqxmd.com/read/29335558/strongly-exchange-coupled-and-surface-state-modulated-magnetization-dynamics-in-bi2se3-yttrium-iron-garnet-heterostructures
#3
Y T Fanchiang, K H M Chen, C C Tseng, C C Chen, C K Cheng, S R Yang, C N Wu, S F Lee, M Hong, J Kwo
Harnessing the spin-momentum locking of topological surface states in conjunction with magnetic materials is the first step to realize novel topological insulator-based devices. Here, we report strong interfacial coupling in Bi2Se3/yttrium iron garnet (YIG) bilayers manifested as large interfacial in-plane magnetic anisotropy (IMA) and enhancement of damping probed by ferromagnetic resonance. The interfacial IMA and damping enhancement reaches a maximum when the Bi2Se3 film approaches its two-dimensional limit, indicating that topological surface states play an important role in the magnetization dynamics of YIG...
January 15, 2018: Nature Communications
https://www.readbyqxmd.com/read/29333464/comparison-of-tof-pet-and-bremsstrahlung-spect-images-of-yttrium-90-a-monte-carlo-simulation-study
#4
Akihiko Takahashi, Kazuhiko Himuro, Shingo Baba, Yasuo Yamashita, Masayuki Sasaki
Objectives: Yttrium-90 (90Y) is a beta particle nuclide used in targeted radionuclide therapy which is available to both single-photon emission computed tomography (SPECT) and time-of-flight (TOF) positron emission tomography (PET) imaging. The purpose of this study was to assess the image quality of PET and Bremsstrahlung SPECT by simulating PET and SPECT images of 90Y using Monte Carlo simulation codes under the same conditions and to compare them. Methods: In-house Monte Carlo codes, MCEP-PET and MCEP-SPECT, were employed to simulate images...
2018: Asia Oceania Journal of Nuclear Medicine & Biology
https://www.readbyqxmd.com/read/29331342/development-of-a-prognostic-score-to-predict-response-to-yttrium-90-radioembolization-for-hepatocellular-carcinoma-with-portal-vein-invasion
#5
Carlo Spreafico, Carlo Sposito, Marta Vaiani, Tommaso Cascella, Sherrie Bhoori, Carlo Morosi, Rodolfo Lanocita, Raffaele Romito, Carlo Chiesa, Marco Maccauro, Alfonso Marchianò, Vincenzo Mazzaferro
BACKGROUND & AIMS: Yttrium-90 trans-arterial radioembolization (TARE) has shown promising efficacy in the treatment of patients with hepatocellular carcinoma (HCC) associated with tumoral portal vein thrombosis (PVTT). Aim of this study is to identify prognostic factors for survival in patients with HCC and PVTT undergoing TARE, and build a prognostic classification for these patients. METHODS: This is a single Center retrospective study conducted over 6 years (2010-2015), on consecutive patients undergoing TARE...
January 10, 2018: Journal of Hepatology
https://www.readbyqxmd.com/read/29329568/prospective-longitudinal-quality-of-life-and-survival-outcomes-in-patients-with-advanced-infiltrative-hepatocellular-carcinoma-and-portal-vein-thrombosis-treated-with-yttrium-90-radioembolization
#6
Minzhi Xing, Nima Kokabi, Juan C Camacho, Hyun S Kim
BACKGROUND: To determine the effect of Yttrium-90 (Y90) radioembolization on health-related quality of life (HRQOL) and its effect on overall survival advanced, unresectable infiltrative hepatocellular carcinoma (HCC) patients with concurrent portal vein thrombosis (PVT). METHODS: Consecutive patients with unresectable infiltrative HCC and PVT were recruited. The Short-Form 36 (SF-36) questionnaire was used to assess HRQOL for consecutive patients treated with glass-based Y90 based on a prospective phase II trial...
January 12, 2018: BMC Cancer
https://www.readbyqxmd.com/read/29328186/single-crystal-er3-%C3%A2-%C3%A2-yag-fibers-with-tailored-refractive-index-profiles
#7
L Cheng, T Chick, J Chapman, E F C Dreyer, C D Nie, S Bera, J A Harrington, S C Rand
Erbium-doped yttrium aluminum garnet (Er3+:YAG) rods were inserted inside undoped tubes and grown into single-crystal fibers of a diameter of 300 μm using the laser-heated pedestal growth technique. Growth at various rates resulted in radially graded distributions of Er3+ dopant ions, as observed using laser-induced fluorescence imaging. Profiles of the refractive index were measured using cross-sectional reflectometry in a microscope. Dopant distributions and the corresponding index profiles were compared with thermal diffusion theory to determine the inter-diffusion coefficient of Y3+ and Er3+ ions at 2000°C, yielding an estimated value of D=(9...
January 10, 2018: Applied Optics
https://www.readbyqxmd.com/read/29325889/early-cell-response-of-osteogenic-cells-on-differently-modified-implant-surfaces-sequences-of-cell-proliferation-adherence-and-differentiation
#8
Sebastian Blatt, Andreas Max Pabst, Eik Schiegnitz, Marco Hosang, Thomas Ziebart, Christian Walter, Bilal Al-Nawas, Marcus Oliver Klein
OBJECTIVES: Osseointegration of dental implants is a crucial prerequisite for long-term survival. Therefore, surface modifications are needed to interact with the extracellular environment and to trigger osteogenic cell responses such as cell proliferation, adherence, and differentiation. The purpose of this study was to investigate different surface modifications in vitro over 2 weeks. MATERIALS AND METHODS: Commercially available cells from a human osteogenic cell line (HHOB-c) were cultivated on the following surfaces: titanium with smooth surfaces (polished titanium (P), machined titanium (M), polyetheretherketone (Peek)), titanium with rough and hydrophilised surfaces (acid etched titanium (A), sandblasted acid etched titanium (SA and SA2), sandblasted acid etched hydrophilised (SAH), titanium plasma painted titanium (TPS)), titanium with calcium phosphate-containing surfaces (titanium plasma painted calcium phosphate modified titanium (TPS-CaP), sandblasted calcium phosphate modified titanium (S-CaP), sandblasted acid etched calcium phosphate modified titanium (SA-CaP)), and zirconium-oxide (yttrium amplified zirconium (Z), yttrium amplified Ca2+ delivering zirconium (Z-Ca))...
December 26, 2017: Journal of Cranio-maxillo-facial Surgery
https://www.readbyqxmd.com/read/29322765/influence-of-non-stoichiometry-on-proton-conductivity-in-thin-film-yttrium-doped-barium-zirconate
#9
Jilai Ding, Janakiraman Balachandran, Xiahan Sang, Wei Guo, Gabriel M Veith, Craig A Bridges, Christopher M Rouleau, Jonathan David Poplawsky, Nazanin Bassiri-Gharb, Panchapakesan Ganesh, Raymond R Unocic
Proton conducting perovskites have been widely studied due to their potential application as solid electrolytes in intermediate temperature solid oxide fuel cells. Structural and chemical heterogeneities can develop during synthesis, device fabrication or service, which can profoundly affect proton transport. Here, we use time-resolved Kelvin probe force microscopy, scanning transmission electron microscopy, atom probe tomography and density functional theory calculations to intentionally introduce Ba-deficient planar and spherical defects, and link the resultant atomic structure with proton transport behavior in both stoichiometric and non-stoichiometric epitaxial, yttrium doped barium zirconate thin films...
January 11, 2018: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/29322402/laser-treatment-of-primary-axillary-hyperhidrosis-a-review-of-the-literature
#10
Jessica Cervantes, Marina Perper, Ariel E Eber, Raymond M Fertig, John P Tsatalis, Keyvan Nouri
Hyperhidrosis o`ccurs when the body produces sweat beyond what is essential to maintain thermal homeostasis. The condition tends to occur in areas marked by high-eccrine density such as the axillae, palms, and soles and less commonly in the craniofacial area. The current standard of care is topical aluminum chloride hexahydrate antiperspirant (10-20%), but other treatments such as anticholinergics, clonidine, propranolol, antiadrenergics, injections with attenuated botulinum toxin, microwave technology, and surgery have been therapeutically implicated as well...
January 11, 2018: Lasers in Medical Science
https://www.readbyqxmd.com/read/29316160/luminescence-properties-of-tm3-ions-single-doped-yf3-materials-in-an-unconventional-excitation-region
#11
Yuan Chen, Qing Liu, Han Lin, Xiaohong Yan
According to the spectral distribution of solar radiation at the earth's surface, under the excitation region of 1150 to 1350 nm, the up-conversion luminescence of Tm3+ ions was investigated. The emission bands were matched well with the spectral response region of silicon solar cells, achieved by Tm3+ ions single-doped yttrium fluoride (YF3 ) phosphor, which was different from the conventional Tm3+ /Yb3+ ion couple co-doped materials. Additionally, the similar emission bands of Tm3+ ions were achieved under excitation in the ultraviolet region...
January 9, 2018: Luminescence: the Journal of Biological and Chemical Luminescence
https://www.readbyqxmd.com/read/29306542/prospective-study-to-determine-early-hypertrophy-of-the-contra-lateral-liver-lobe-after-unilobar-yttrium-90-selective-internal-radiation-therapy-in-patients-with-hepatocellular-carcinoma
#12
Jin Yao Teo, John Carson Allen, David Chee Eng Ng, Julianah Bee Abdul Latiff, Su Pin Choo, David Wai-Meng Tai, Albert Su Chong Low, Foong Koon Cheah, Jason Pik Eu Chang, Juinn Huar Kam, Victor T W Lee, Alexander Yaw Fui Chung, Chung Yip Chan, Pierce Kah Hoe Chow, Brian K P Goh
BACKGROUND: Liver resection is a major curative option in patients presenting with hepatocellular carcinoma. An inadequate functional liver remnant is a major limiting factor precluding liver resection. In recent years, hypertrophy of the functional liver remnant after selective internal radiation therapy hypertrophy has been observed, but the degree of hypertrophy in the early postselective internal radiation therapy period has not been well studied. METHODS: We conducted a prospective study on patients undergoing unilobar, Yttrium-90 selective internal radiation therapy for hepatocellular carcinoma to evaluate early hypertrophy at 4-6 weeks and 8-12 weeks after selective internal radiation therapy...
January 3, 2018: Surgery
https://www.readbyqxmd.com/read/29305571/laser-application-to-the-root-surface-increases-the-bonding-strength-of-surface-treated-prefabricated-glass-fiber-posts-in-teeth-with-excessive-substance-loss
#13
Zuhal Gorus, Ayse Mese, Berivan Dundar Yilmaz, Ozkan Adiguzel
BACKGROUND This study examined the effect of roughening of the root surface using an erbium-doped yttrium aluminum garnet (Er: YAG) laser on the binding strength of teeth undergoing root canal treatment. MATERIAL AND METHODS Ninety single-rooted teeth were used and assigned randomly to 9 groups (n=10 each). Root canals were prepared using the FlexMaster rotary system. An Er: YAG laser was applied to the root canals in Group 1, with no surface treatment of the glass-fiber post. In Group 2, aluminum oxide particles were applied...
January 6, 2018: Medical Science Monitor: International Medical Journal of Experimental and Clinical Research
https://www.readbyqxmd.com/read/29299693/picosecond-532-nm-neodymium-doped-yttrium-aluminum-garnet-laser-a-promising-modality-for-the-management-of-verrucous-epidermal-nevi
#14
Assi Levi, Dan Ben Amitai, Daniel Mimouni, Yael A Leshem, Ofir Arzi, Moshe Lapidoth
The verrucous epidermal nevus (VEN) is the most common type of epidermal nevi. As lesions can be disfiguring, treatment is often sought. Many therapeutic approaches have been reported, with variable efficacy and safety. Picosecond (PS) lasers are novel laser devices designated to target small chromophores. A side effect of these lasers is blistering due to epidermal-dermal separation. We aimed to harness this side effect of the PS lasers to treat patients with VEN. The purpose of this study was to report our experience treating VEN using a PS 532-nm laser...
January 3, 2018: Lasers in Medical Science
https://www.readbyqxmd.com/read/29299370/safety-of-selective-internal-radiation-therapy-sirt-with-yttrium-90-microspheres-combined-with-systemic-anticancer-agents-expert-consensus
#15
REVIEW
Andrew Kennedy, Daniel B Brown, Jonas Feilchenfeldt, John Marshall, Harpreet Wasan, Marwan Fakih, Peter Gibbs, Alexander Knuth, Bruno Sangro, Michael C Soulen, Gianfranco Pittari, Ricky A Sharma
Selective internal radiation therapy (SIRT) with microspheres labelled with the β-emitter yttrium-90 (Y-90) enables targeted delivery of radiation to hepatic tumors. SIRT is primarily used to treat inoperable primary or metastatic liver tumors. Eligible patients have usually been exposed to a variety of systemic anticancer therapies, including cytotoxic agents, targeted biologics, immunotherapy and peptide receptor radionuclide therapy (PRRT). All these treatments have potential interactions with SIRT; however, robust evidence on the safety of these potential combinations is lacking...
December 2017: Journal of Gastrointestinal Oncology
https://www.readbyqxmd.com/read/29296111/effect-of-surface-treatment-on-enamel-cracks-after-orthodontic-bracket-debonding-er-cr-ysgg-laser-etching-versus-acid-etching
#16
Hassanali Ghaffari, Amirhossein Mirhashemi, Tahereh Baherimoghadam, Amir Azmi, Reza Rasooli
Objectives: This study sought to compare enamel cracks after orthodontic bracket debonding in the surfaces prepared with erbium, chromium: yttrium-scandium-galliumgarnet (Er,Cr:YSGG) laser and the conventional acid-etching technique. Materials and Methods: This in-vitro experimental study was conducted on 60 sound human premolars extracted for orthodontic purposes. The teeth were randomly divided into two groups (n=30). The teeth in group A were etched with 37% phosphoric acid gel, while the teeth in group B were subjected to Er,Cr:YSGG laser irradiation (gold handpiece, MZ8 tip, 50Hz, 4...
September 2017: Journal of Dentistry of Tehran University of Medical Sciences
https://www.readbyqxmd.com/read/29295988/momentum-resolved-observations-of-the-phonon-instability-driving-geometric-improper-ferroelectricity-in-yttrium-manganite
#17
Dipanshu Bansal, Jennifer L Niedziela, Ryan Sinclair, V Ovidiu Garlea, Douglas L Abernathy, Songxue Chi, Yang Ren, Haidong Zhou, Olivier Delaire
Magnetoelectrics offer tantalizing opportunities for devices coupling ferroelectricity and magnetism but remain difficult to realize. Breakthrough strategies could circumvent the mutually exclusive origins of magnetism and ferroelectricity by exploiting the interaction of multiple phonon modes in geometric improper and hybrid improper ferroelectrics. Yet, the proposed instability of a zone-boundary phonon mode, driving the emergence of ferroelectricity via coupling to a polar mode, remains to be directly observed...
January 2, 2018: Nature Communications
https://www.readbyqxmd.com/read/29291493/89zr-for-antibody-labeling-and-in-vivo-studies-a-comparison-between-liquid-and-solid-target-production
#18
Gemma M Dias, Caterina F Ramogida, Julie Rousseau, Nicholas A Zacchia, Cornelia Hoehr, Paul Schaffer, Kuo-Shyan Lin, François Bénard
INTRODUCTION: Zirconium-89 (89Zr, t1/2=78.4h) liquid target (LT) production offers an approach to introduce this positron-emitting isotope to cyclotron centres without the need for a separate solid target (ST) production set up. We compared the production, purification, and antibody radiolabeling yields of 89Zr-(LT) and 89Zr-(ST), and assessed the feasibility of 89Zr-(LT) for preclinical PET/CT. METHODS: 89Zr-(ST) production was performed with an 89Y foil on a TR 19 cyclotron at 13...
November 16, 2017: Nuclear Medicine and Biology
https://www.readbyqxmd.com/read/29290464/complex-upper-arm-reconstruction-using-an-antero-lateral-thigh-free-flap-after-an-extravasation-of-yttrium-90-ibritumomab-tiuxetan-a-case-report-and-literature-review
#19
A Baus, C Keilani, C-S Bich, F Entine, M Brachet, P Duhamel, J-C Amabile, J V Malfuson, E Bey
Yttrium-90-Ibritumomab Tiuxetan (Zevalin®) is used in the treatment of non- Hodgkin's lymphoma. Extravasation is an iatrogenic complication that is fortunately rare. However, the treatment of this complication is often complex due to the risk of extensive skin necrosis and unpredictable evolution of localized irradiation. This vesicant drug requires emergency management when extravasation occured. Radiations burns have specificities. Therefore, wound coverage involves specific plastic surgical techniques. Here, we report the case of a man presenting a chronic and extensive skin necrosis of upper arm treated with an antero-lateral thigh free flap...
December 28, 2017: Annales de Chirurgie Plastique et Esthétique
https://www.readbyqxmd.com/read/29285636/the-effect-of-selective-internal-radiation-therapy-with-yttrium-90-resin-microspheres-on-lung-carbon-monoxide-diffusion-capacity
#20
Tunc Ones, Emel Eryuksel, Feyyaz Baltacioglu, Berrin Ceyhan, Tanju Yusuf Erdil
BACKGROUND: Selective internal radiation therapy (SIRT) with embolization of branches of the hepatic artery is a valuable therapeutic tool for patients with hepatic malignancies; however, it is also associated with lung injury risk due to shunting. Diffusion capacity of the lungs for carbon monoxide (DLCO) is a clinically significant lung function test, and worsening in DLCO is suggested to reflect a limited gas exchange reserve caused by the potential toxicity of chemoradiotherapy or it may be a marker of related lung injury...
December 29, 2017: EJNMMI Research
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