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https://www.readbyqxmd.com/read/28741348/super-resolution-far-field-infrared-imaging-by-photothermal-heterodyne-imaging
#1
Zhongming Li, Kyle Aleshire, Masaru Kuno, Gregory V Hartland
Infrared (IR) imaging provides chemical-specific information without the need for exogenous labels. Conventional far-field IR imaging techniques are diffraction limited, which means an effective spatial resolution of > 5 μm with currently available optics. In this paper we present a novel far-field IR imaging technique based on photothermal heterodyne imaging (IR-PHI). In our version of IR-PHI an IR pump laser excites the sample, causing a small temperature rise that is detected by a counter-propagating visible probe beam...
July 25, 2017: Journal of Physical Chemistry. B
https://www.readbyqxmd.com/read/28741297/maldi-ft-icr-ms-for-archaeological-lipid-residue-analysis
#2
Ester Oras, Signe Vahur, Sven Isaksson, Ivari Kaljurand, Ivo Leito
Soft-ionization methods are currently at the forefront of developing novel methods for analysing degraded archaeological organic residues. Here we present little-used soft ionisation method of matrix assisted laser desorption/ionization - Fourier transform - ion cyclotron resonance - mass spectrometry (MALDI-FT-ICR-MS) for the identification of archaeological lipid residues. It is a high-resolution and sensitive method with low limits of detection capable of identifying lipid compounds in small concentrations, thus providing a highly potential new technique for the analysis of degraded lipid components...
July 24, 2017: Journal of Mass Spectrometry: JMS
https://www.readbyqxmd.com/read/28735428/effects-of-low-intensity-pulsed-ultrasound-on-soft-tissue-micro-circulation-in-the-foot
#3
Anna Katharina Kösters, Bergita Ganse, Boyko Gueorguiev, Kajetan Klos, Ali Modabber, Sven Nebelung, Bong-Sung S Kim, Matthias Knobe
PURPOSE: Low-intensity pulsed ultrasound (LIPUS) has been shown to accelerate bone healing and is considered to increase blood flow. The aim of this study was to assess changes in micro-circulation of the foots' soft tissue in response to LIPUS intervention. We hypothesised improved micro-circulation in response to LIPUS. METHODS: Micro-circulation was assessed in 2 mm and 8 mm-deep skin of 50 healthy volunteers using non-invasive laser-doppler spectrophotometry (O2C-device)...
July 22, 2017: International Orthopaedics
https://www.readbyqxmd.com/read/28721995/comparative-evaluation-of-laser-microtextured-implant-versus-machined-collar-implant-for-soft-and-hard-tissue-attachment-a-clinical-and-radiological-study
#4
Saroj Kumar Rath, Manab Kosala, Ankit Gupta
BACKGROUND: Various mechanical modifications in the collar region of endosseous implants is a challenge for better performance and osseointegration. Here is a comparative evaluation being carried out to find out the effect of the machined collar (MC) and Laser-Lok (LL)-modified titanium implants on the success of implants being commonly advocated in partially edentulous among serving personnel and their families. MATERIALS AND METHODS: Twenty-four patients with appropriate inclusion and exclusion criteria were selected for placement of Biohorizons MC and LL implants in 12 cases each...
May 2017: Indian Journal of Dental Research: Official Publication of Indian Society for Dental Research
https://www.readbyqxmd.com/read/28708657/reconstruction-of-facial-cervical-scars-with-pedicled-expanded-deltopectoral-flap
#5
Xianjie Ma, Yang Li, Weiyang Li, Chaohua Liu, Hengxin Liu, Ping Xue, Jiangbo Cui
The facial-cervical scars bring the suffering to the patients both physically and mentally. Choosing a proper donor soft tissue is always one of the critical issues, especially to Asian patients. Among the common used donor sites, the deltopectoral site was conceived as the most suitable donor tissue for the reconstruction in face and neck for its adjacent site and match in color and texture. There were 220 patients with facial-cervical scars reconstructed by the pedicled expanded deltopectoral flap between 2007 through 2015 in the authors' hospital...
July 13, 2017: Journal of Craniofacial Surgery
https://www.readbyqxmd.com/read/28706258/transverse-coherence-limited-coherent-diffraction-imaging-using-a-molybdenum-soft-x-ray-laser-pumped-at-moderate-pump-energies
#6
M Zürch, R Jung, C Späth, J Tümmler, A Guggenmos, D Attwood, U Kleineberg, H Stiel, C Spielmann
Coherent diffraction imaging (CDI) in the extreme ultraviolet has become an important tool for nanoscale investigations. Laser-driven high harmonic generation (HHG) sources allow for lab scale applications such as cancer cell classification and phase-resolved surface studies. HHG sources exhibit excellent coherence but limited photon flux due poor conversion efficiency. In contrast, table-top soft X-ray lasers (SXRL) feature excellent temporal coherence and extraordinary high flux at limited transverse coherence...
July 13, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28700131/high-intensity-focused-ultrasound-hifu-and-phase-sensitive-optical-coherence-tomography-phs-oct-for-high-resolution-surface-acoustic-wave-saw-elastography
#7
Kanheng Zhou, Nhan Le, Zhihong Huang, Chunhui Li
Elastography has the ability of quantitatively evaluating the mechanical properties of soft tissue, thus is helpful for diagnosis and treatment monitoring for many diseases, e.g. skin diseases. Surface acoustic waves (SAWs) have been proven to be a non-invasive, non-destructive method for accurate characterization of tissue elastic properties. Current surface acoustic wave elastography using high energy laser pulse or mechanical shaker still have some problems. In order to improve SAW elastography in medical application, a new technique was proposed in this paper, which combines high intensity focused ultrasound (HIFU) as a SAWs impulse inducer and PhS-OCT as a SAWs detector...
July 12, 2017: Journal of Biophotonics
https://www.readbyqxmd.com/read/28699085/laser-interstitial-thermal-therapy-for-epilepsy
#8
REVIEW
Eric Prince, Shahin Hakimian, Andrew L Ko, Jeffrey G Ojemann, Michelle S Kim, John W Miller
MRI-guided laser interstitial thermal therapy (MgLiTT) uses a narrow diameter cannula to stereotactically target and heat deeper cerebral structures. This technique produces a precise lesion in the brain with great reliability because the localized tissue temperature change is monitored in real time. Because MgLiTT minimizes injury to surrounding brain, it appears to have a lower risk of affecting normal neurological function, and because it is done through a burr hole, there is less operative risk, less discomfort, and shorter hospitalizations...
September 2017: Current Neurology and Neuroscience Reports
https://www.readbyqxmd.com/read/28691432/effect-of-diode-lasers-with-wavelength-of-445-and-980-nm-on-a-temperature-rise-when-uncovering-implants-for-second-stage-surgery-an-ex-vivo-study-in-pigs
#9
Jacek Matys, Rafał Flieger, Marzena Dominiak
BACKGROUND: Many surgical procedures in a soft tissue are performed using diodes lasers. Recently, a novel diode laser operates in 445 nm wavelength was introduced in dentistry. OBJECTIVES: The aim of our study was to evaluate a time of surgery and an increase in temperature of a titanium implants during its uncovering using 445 and 980 nm wavelengths. MATERIAL AND METHODS: The research included 45 pig mandibles (n=45). The specimens were randomly divided into 3 groups (n=15) according to the laser irradiation mode and wavelength; G1 - 445nm laser, power: 3 W, continuous wave (CW), distance: 2 mm, power density: 7460 W/cm2, fiber: 320µm, none-contact mode; G2 - 445nm laser (power: 2 W, CW, power density: 4970 W/cm2, fiber: 320µm, contact mode; G3 (control) - 980nm laser, power: 2...
June 27, 2017: Advances in Clinical and Experimental Medicine: Official Organ Wroclaw Medical University
https://www.readbyqxmd.com/read/28681893/damage-free-tip-enhanced-raman-spectroscopy-for-heat-sensitive-materials
#10
Masahito Mochizuki, Ganchimeg Lkhamsuren, Kasinan Suthiwanich, Evan Angelo Mondarte, Taka-Aki Yano, Masahiko Hara, Tomohiro Hayashi
We report a method to establish experimental conditions for tip-enhanced Raman spectroscopy (TERS) with low thermal and mechanical damage to samples. In this method, we monitor the thermal desorption of thiol molecules from a gold-coated probe of an atomic force microscope (AFM) via TERS spectra. Temperatures for desorption of thiol molecules (60-100 °C) from gold surfaces cover the temperature range for degradation of heat-sensitive biomaterials (e.g. proteins). By monitoring the desorption of the thiols on the probe, we can estimate the power of an excitation laser for the samples to reach their critical temperatures for thermal degradation...
July 6, 2017: Nanoscale
https://www.readbyqxmd.com/read/28680101/a-storage-ring-based-free-electron-laser-for-generating-ultrashort-coherent-euv-and-x-ray-radiation
#11
Chao Feng, Zhentang Zhao
Generation of ultrashort coherent radiation pulses in the extreme ultraviolet (EUV) and x-ray regime is of remarkable interest in the synchrotron radiation user community. In this work, a novel technique is proposed for directly imprinting strong coherent microbunching on the electron beam with very small laser-induced energy spread. Theoretical analysis and numerical simulations demonstrated that this technique can be used for the generation of megawatt-scale level, fully temporal coherent femtosecond EUV and soft x-ray radiation pulses at a storage ring light source...
July 5, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28678642/a-three-dimensional-soft-tissue-analysis-of-class-iii-malocclusion-a-case-controlled-cross-sectional-study
#12
Ama Johal, Amrit Chaggar, Li Fong Zou
OBJECTIVE: The present study used the optical surface laser scanning technique to compare the facial features of patients aged 8-18 years presenting with Class I and Class III incisor relationship in a case-control design. MATERIALS AND METHODS: Subjects with a Class III incisor relationship, aged 8-18 years, were age and gender matched with Class I control and underwent a 3-dimensional (3-D) optical surface scan of the facial soft tissues. RESULTS: Landmark analysis revealed Class III subjects displayed greater mean dimensions compared to the control group most notably between the ages of 8-10 and 17-18 years in both males and females, in respect of antero-posterior (P = 0...
July 5, 2017: Journal of Orthodontics
https://www.readbyqxmd.com/read/28675828/comparison-of-three-dimensional-facial-morphology-between-upright-and-supine-positions-employing-three-dimensional-scanner-from-live-subjects
#13
Ozgur Bulut, Ching-Yiu Jessica Liu, Fatih Koca, Caroline Wilkinson
Facial soft tissue thicknesses (FSTT) measurements collected from Magnetic Resonance Imaging (MRI) and Computed Tomography (CT) imaging techniques are most commonly taken in the supine position for forensic craniofacial reconstruction. FSTT have been shown to be different in comparison to the upright position due to gravity. The variation of facial morphology between the upright and supine position of laser-scanned images taken from 44 individuals was investigated using volumetric analysis with deviation maps...
June 22, 2017: Legal Medicine
https://www.readbyqxmd.com/read/28675223/carbon-nanowalls-a-new-versatile-graphene-based-interface-for-the-laser-desorption-ionization-mass-spectrometry-detection-of-small-compounds-in-real-samples
#14
I S Hosu, M Sobaszek, M Ficek, R Bogdanowicz, H Drobecq, L Boussekey, A Barras, O Melnyk, R Boukherroub, Y Coffinier
Carbon nanowalls, vertically aligned graphene nanosheets, attract attention owing to their tunable band gap, high conductivity, high mechanical robustness, high optical absorbance and other remarkable properties. In this paper, we report for the first time the use of hydrophobic boron-doped carbon nanowalls (CNWs) for laser desorption/ionization of small compounds and their subsequent detection by mass spectrometry (LDI-MS). The proposed method offers sensitive detection of various small molecules in the absence of an organic matrix...
July 13, 2017: Nanoscale
https://www.readbyqxmd.com/read/28674791/effects-of-the-gaalas-diode-laser-780%C3%A2-nm-on-the-periodontal-tissues-during-orthodontic-tooth-movement-in-diabetes-rats-histomorphological-and-immunohistochemical-analysis
#15
Mônica Fernandes Gomes, Maria da Graças Vilela Goulart, Lilian Chrystiane Giannasi, Cybelle Mori Hiraoka, Gabriela de Fátima Santana Melo, Aretha Graziela Vilela de Sousa, Celestino José Prudente Nóbrega, Renato Amaro Zangaro, Miguel Angel Castillo Salgado
The purposes of the present study are to assess the effects of the GaAlAs diode laser on the periodontal tissues and to investigate its action on the alveolar bone remodeling process during orthodontic tooth movement in normoglycemic and diabetic rats. Sixty adult male Wistar rats were divided into four groups of 15 rats: normoglycemic (N), diabetic (D), laser-normoglycemic (LN), and laser-diabetic (LD) rats. Diabetes mellitus was induced by a single intravenous injection of 40 mg/kg monohydrated alloxan. The orthodontically moved tooth underwent a force magnitude of 20 cN...
July 3, 2017: Lasers in Medical Science
https://www.readbyqxmd.com/read/28671917/experimental-simulation-of-clinical-borderline-situations-in-temporal-bone-specimens-after-ossiculoplasty
#16
Till F Jakob, Jan Kromeier, Tobias Baumann, Jens Pfeiffer, Marcus Neudert, Roland Laszig, Thomas Zahnert, Christian Offergeld
OBJECTIVES: One reason for insufficient hearing improvement with a distinct air-bone gap after ossiculoplasty with implantation of partial or total ossicular replacement prostheses can be the dislocation or minimal shifting of the prosthesis. The aim of this study was the simulation of common clinical borderline situations with minimal shifting of the prosthesis in temporal bone specimens after ossiculoplasty. It was furthermore the goal to identify these specific situations through imaging by cone beam computed tomography (cbCT) and direct visual inspection using the operation microscope...
June 30, 2017: Ear and Hearing
https://www.readbyqxmd.com/read/28666611/treatment-of-xanthelasma-palpebrarum-with-a-1064-nm-q-switched-nd-yag-laser
#17
Jun Khee Heng, Sze Hon Chua, Chee Leok Goh, Suzanne Cheng, Virlynn Tan, Wee Ping Tan
BACKGROUND: Xanthelasma palpebrarum is the most common cutaneous xanthoma characterized by soft, yellow papules or plaques that arise on the periorbital skin. As these lesions can be cosmetically disfiguring, many patients seek medical help to remove these lesions. OBJECTIVE: To determine the effectiveness and minimum number of treatment sessions with a 1064-nm, Q-switched neodymium-doped yttrium aluminum garnet (Nd:YAG) laser for the treatment of xanthelasma. METHODS: A retrospective review of patients with xanthelasma consecutively treated with Q-switched Nd:YAG laser was conducted...
June 27, 2017: Journal of the American Academy of Dermatology
https://www.readbyqxmd.com/read/28664896/pump-probe-experiments-at-the-tempo-beamline-using-the-low-%C3%AE-operation-mode-of-synchrotron-soleil
#18
Mathieu G Silly, Tom Ferté, Marie Agnes Tordeux, Debora Pierucci, Nathan Beaulieu, Christian Chauvet, Federico Pressacco, Fausto Sirotti, Horia Popescu, Victor Lopez-Flores, Marina Tortarolo, Maurizio Sacchi, Nicolas Jaouen, Philippe Hollander, Jean Paul Ricaud, Nicolas Bergeard, Christine Boeglin, Bharati Tudu, Renaud Delaunay, Jan Luning, Gregory Malinowski, Michel Hehn, Cédric Baumier, Franck Fortuna, Damjan Krizmancic, Luigi Stebel, Rudi Sergo, Giuseppe Cautero
The SOLEIL synchrotron radiation source is regularly operated in special filling modes dedicated to pump-probe experiments. Among others, the low-α mode operation is characterized by shorter pulse duration and represents the natural bridge between 50 ps synchrotron pulses and femtosecond experiments. Here, the capabilities in low-α mode of the experimental set-ups developed at the TEMPO beamline to perform pump-probe experiments with soft X-rays based on photoelectron or photon detection are presented. A 282 kHz repetition-rate femtosecond laser is synchronized with the synchrotron radiation time structure to induce fast electronic and/or magnetic excitations...
July 1, 2017: Journal of Synchrotron Radiation
https://www.readbyqxmd.com/read/28663839/optoacoustic-response-of-gold-nanorods-in-soft-phantoms-using-high-power-diode-laser-assemblies-at-870-and-905-nm
#19
L Leggio, S Gawali, D Gallego, S Rodríguez, M Sánchez, G Carpintero, H Lamela
In the present paper we show the optoacoustic (OA) response of two solutions of gold nanorods dispersed in distilled water (0.8 mg/ml) and hosted in tissue-like phantoms by using small arrays of HPDLs at 870 and 905 nm as excitation sources. The HPDLs are coupled to a 7-to-1 optical fiber bundle with output diameter of 675 μm. Each solution of gold nanorods exhibits an absorption peak close to the operating wavelength, i.e. ~860 nm and ~900 nm, respectively, to optimize the generation of OA signals. The phantoms are made of agar, intralipid and hemoglobin to simulate a soft biological tissue with reduced properties of scattering...
March 1, 2017: Biomedical Optics Express
https://www.readbyqxmd.com/read/28663024/comparison-and-evaluation-of-marginal-and-internal-gaps-in-cobalt-chromium-alloy-copings-fabricated-using-subtractive-and-additive-manufacturing
#20
Dong-Yeon Kim, Ji-Hwan Kim, Hae-Young Kim, Woong-Chul Kim
PURPOSE: To evaluate the marginal and internal gaps of cobalt-chromium (Co-Cr) alloy copings fabricated using subtractive and additive manufacturing. METHODS: A study model of an abutment tooth 46 was prepared by a 2-step silicone impression with dental stone. Fifteen stereolithography files for Co-Cr alloy copings were compiled using a model scanner and dental CAD software. Using the lost wax (LW), wax block (WB), soft metal block (SMB), microstereolithography (μ-SLA), and selected laser melting (SLM) techniques, 15 Co-Cr alloy copings were fabricated per group...
June 26, 2017: Journal of Prosthodontic Research
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