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Pulsed dye laser

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https://www.readbyqxmd.com/read/29752644/a-new-candidate-laser-dye-based-1-4-bis-%C3%AE-2-naphthothiazolyle-vinyl-benzene-spectroscopic-behavior-laser-parameters-and-excitation-energy-transfer
#1
Abeer N Al-Romaizan, Mahmoud A Hussein
A new candidate laser dye based 1,4-bis[β-(2-naphthothisolyl) vinyl] benzene (BNTVB) were prepared, and characterized in various organic solvents. The center polarity is less sensitive than electronic absorption. A red shift was noticed in the fluorescence spectra (ca. 40 nm) with increment in the solvent's polarity, this means that BNTVB's polarity appreciates upon excitation. The dipole moment of ground state (μg ) and the excited singlet state dipole moment (μe ) are determined from Kawski - Chamma and Bakshiev-Viallet equations using the disparity of Stokes shift with solvent polarity function of ε (dielectric constant) and n (refractive index) of the solvent...
May 12, 2018: Journal of Fluorescence
https://www.readbyqxmd.com/read/29744754/less-is-more-similar-efficacy-in-three-sessions-and-seven-sessions-of-pulsed-dye-laser-treatment-in-infantile-port-wine-stain-patients
#2
Jiafang Zhu, Wenxin Yu, Tianyou Wang, Yijie Chen, Dongze Lyu, Lei Chang, Gang Ma, Xiaoxi Lin
Port-wine stains (PWS) affect 0.3 to 0.5% of newborns and pulsed dye laser (PDL) remains the treatment of choice. However, no reliable study regarding the benefits of more frequent has been conducted. We designed the present study to evaluate whether more frequent PDL treatments in infantile patients would achieve further lightening of erythema. We prospectively investigated 20 infants with PWS. Two adjacent sites were both treated for a 12-week duration and randomly allocated to be treated for seven sessions at 2-week intervals or three sessions at 6-week intervals...
May 10, 2018: Lasers in Medical Science
https://www.readbyqxmd.com/read/29731585/xanthelasma-an-update-on-treatment-modalities
#3
REVIEW
Zainab Laftah, Firas Al-Niaimi
Xanthelasmas are localized accumulation of lipid deposits on the eyelids. Lesions are typically asymptomatic and treatment is often sought for cosmetic purposes. Unfortunately, there is paucity of strong evidence in the literature for the effective treatment of normolipidemic xanthelasmas. A literature search using the term "xanthelasma" was carried out in PubMed and Medline databases. Only articles related to treatment were considered and analyzed for their data. Commonly cited treatments include topical trichloroacetic acid, liquid nitrogen cryotherapy, and various lasers including carbon dioxide, Er:YAG, Q-switched Nd:YAG, and pulse dye laser...
January 2018: Journal of Cutaneous and Aesthetic Surgery
https://www.readbyqxmd.com/read/29714732/nanobomb-optical-coherence-elastography
#4
Chih-Hao Liu, Dmitry Nevozhay, Alexander Schill, Manmohan Singh, Susobhan Das, Achuth Nair, Zhaolong Han, Salavat Aglyamov, Kirill V Larin, Konstantin V Sokolov
Wave-based optical elastography is rapidly emerging as a powerful technique for quantifying tissue biomechanical properties due to its noninvasive nature and high displacement sensitivity. However, current approaches are limited in their ability to produce high-frequency waves and highly localized mechanical stress. In this Letter, we demonstrate that the rapid liquid-to-gas phase transition of dye-loaded perfluorocarbon nanodroplets ("nanobombs") initiated by a pulsed laser can produce highly localized, high-frequency, and broadband elastic waves...
May 1, 2018: Optics Letters
https://www.readbyqxmd.com/read/29676592/pulsed-dye-laser-as-an-adjuvant-treatment-for-discoid-lupus-erythematosus-a-randomized-controlled-trial
#5
Pawinee Rerknimitr, Nucharin Tekacharin, Ratchathorn Panchaprateep, Jade Wititsuwannakul, Pattarin Tangtanatakul, Nattiya Hirankarn, Pravit Asawanonda
PURPOSE: To evaluate the efficacy and safety of PDL for DLE in a double blinded, randomized, controlled fashion. METHOD: Forty-eight DLE lesions from nine patients were recruited. The lesions on one side of the body were randomized into the treatment group and the other side served as a control. Treatments with the PDL (595nm) were delivered every 4 weeks for 4 consecutive months. The patients were evaluated at weeks 0, 4, 8, 12, 16 and 24. Erythema index (EI) and Texture index (TI) were obtained by Antera3D®...
April 20, 2018: Journal of Dermatological Treatment
https://www.readbyqxmd.com/read/29675755/new-445-nm-blue-laser-for-laryngeal-surgery-combines-photoangiolytic-and-cutting-properties
#6
Markus M Hess, Susanne Fleischer, Marcel Ernstberger
BACKGROUND: Photoangiolytic lasers have broadened the surgical armamentarium for many phonosurgical interventions. However, the pulse dye laser and potassium titanyl phosphate (KTP) laser have technical drawbacks and a smaller spectrum of indications. METHODS AND RESULTS: The new 445 nm wavelength laser, the so-called 'blue laser', proves to show tissue effects comparable to the KTP laser and is also capable of treating subepithelial vessels due to its photoangiolytic properties, it can coagulate and carbonize at higher energy levels, and can be used via glass fibers in non-contact and contact mode for in-office procedures...
April 19, 2018: European Archives of Oto-rhino-laryngology
https://www.readbyqxmd.com/read/29667472/evaluation-of-the-effect-of-pulsed-dye-laser-on-chronic-psoriatic-plaque
#7
Nagwa Mohammad Elwan, Shereen Farouk Gheida, Soha Abdalla Hawwam, Abeer Hussien Ahmed
Psoriasis is one of the most prevalent immune mediated skin diseases. Selective vascular destruction by pulsed dye laser is considered one of effective laser treatments. OBJECTIVE: Evaluation of the therapeutic effect of pulsed dye laser in treatment of chronic psoriatic plaque lesions and changes in human beta defensin-2 expression in the psoriatic patients before and after treatment, with correlation to the clinical improvement. METHODS: Twenty patients with psoriatic plaque on right side treated by laser and another plaque on left side similar in size and severity score as control receiving no treatment...
April 18, 2018: Journal of Dermatological Treatment
https://www.readbyqxmd.com/read/29607000/basaloid-follicular-hamartoma-a-case-report-and-a-novel-cosmetic-treatment
#8
Kelly Segars, Hassie Cooper, Daniel J Hogan, Richard Miller, Michael Heaphy, James Spencer
Introduction: Basaloid follicular hamartoma (BFH) is a rare, benign neoplasm of the hair follicle, characterized by multiple brown papules involving the face, scalp, and trunk. It is described by multiple clinical forms, and can present as localized or generalized. Diagnosis is made histologically via biopsy, which is important in order to distinguish BFH from basal cell carcinoma (BCC) or other malignant epithelial neoplasms. Correct diagnosis allows for the avoidance of unnecessary surgeries to remove benign lesions...
March 2018: Journal of Clinical and Aesthetic Dermatology
https://www.readbyqxmd.com/read/29601618/the-use-of-a-self-occluding-topical-anasthetic-in-daily-practice-a-non-interventional-study
#9
Ravi Jain, Gerardo Moreno Arias, Pablo Naranjo, Max Murison, Jose Luis López Estebaranz, Alina Fratila, Welf Prager, Carlos Guillén Barona, Michael Weidmann, Serge Dahan, Hugues Cartier, Gerhard Sattler, Maurizio Podda
INTRODUCTION: A variety of topical anesthetic creams are available to reduce pain associated with dermatological procedures. Pliaglis is a self-occluding eutectic mixture of lidocaine and tetracaine. STUDY OBJECTIVES: To evaluate the post-marketing safety profile of Pliaglis and efficacy in terms of pain reduction, product satisfaction, and daily practice use prior to pre-defined dermatological procedures. METHODS: A prospective, non-interventional study conducted at 44 sites in four European countries; 581 patients were treated prior to dermatological procedures such as pulsed-dye laser therapy, laser-assisted hair removal, non-ablative laser resurfacing, dermal filler injections, and vascular access...
April 1, 2018: Journal of Drugs in Dermatology: JDD
https://www.readbyqxmd.com/read/29601010/flying-particle-microlaser-and-temperature-sensor-in-hollow-core-photonic-crystal-fiber
#10
Richard Zeltner, Riccardo Pennetta, Shangran Xie, Philip St J Russell
Whispering-gallery mode (WGM) resonators combine small optical mode volumes with narrow resonance linewidths, making them exciting platforms for a variety of applications. Here we report a flying WGM microlaser, realized by optically trapping a dye-doped microparticle within a liquid-filled hollow-core photonic crystal fiber (HC-PCF) using a CW laser and then pumping it with a pulsed excitation laser whose wavelength matches the absorption band of the dye. The laser emits into core-guided modes that can be detected at the endfaces of the HC-PCF...
April 1, 2018: Optics Letters
https://www.readbyqxmd.com/read/29583063/double-pass-595-nm-pulsed-dye-laser-does-not-enhance-the-efficacy-of-port-wine-stains-compared-with-single-pass-a-randomized-comparison-with-histological-examination
#11
Wenxin Yu, Jiafang Zhu, Lizhen Wang, Yajing Qiu, Yijie Chen, Xi Yang, Lei Chang, Gang Ma, Xiaoxi Lin
OBJECTIVE: To compare the efficacy and safety of double-pass pulsed dye laser (DWL) and single-pass PDL (SWL) in treating virgin port wine stain (PWS). BACKGROUND: The increase in the extent of vascular damage attributed to the use of double-pass techniques for PWS remains inconclusive. A prospective, side-by-side comparison with a histological study for virgin PWS is still lacking. MATERIALS AND METHODS: Twenty-one patients (11 flat PWS, 10 hypertrophic PWS) with untreated PWS underwent 3 treatments at 2-month intervals...
March 27, 2018: Photomedicine and Laser Surgery
https://www.readbyqxmd.com/read/29566276/angiographic-optical-coherence-tomography-imaging-of-hemangiomas-and-port-wine-birthmarks
#12
Jill S Waibel, Jon Holmes, Ashley Rudnick, Daniel Woods, Kristen M Kelly
OBJECTIVES: A current therapeutic challenge of vascular lesions is that they do not always respond effectively to laser treatment. Information on targeted vessels could potentially be used to guide laser treatments. Optical coherence tomography (OCT) is a useful tool for the non-invasive imaging of tissues, including skin hemangiomas and port wine birthmarks. Dynamic OCT is able to rapidly characterize cutaneous blood vessels. The primary goal of this study was to demonstrate the ability of bedside OCT to image (i) overall vessel pattern; (ii) individual vessel morphology, diameter and depth; and (iii) total vessel density as a function of depth in infantile hemangiomas and port wine birthmarks (PWB)...
March 22, 2018: Lasers in Surgery and Medicine
https://www.readbyqxmd.com/read/29558617/ultrafast-pulse-generation-in-an-organic-nanoparticle-array-laser
#13
Konstantinos Daskalakis, Aaro Ilmari Väkeväinen, Jani-Petri Martikainen, Tommi K Hakala, Päivi Törmä
Nanoscale coherent light sources offer potentially ultrafast modulation speeds which could be utilized for novel sensors and optical switches. Plasmonic periodic structures combined with organic gain materials have emerged as promising candidates for such nanolasers. Their plasmonic component provides high intensity and ultrafast nanoscale-confined electric fields, while organic gain materials offer fabrication flexibility and low acquisition cost. Despite reports on lasing in plasmonic arrays, lasing dynamics in these structures has not been experimentally studied yet...
March 20, 2018: Nano Letters
https://www.readbyqxmd.com/read/29528750/clinical-efficacy-of-diphenylcyclopropenone-immunotherapy-as-monotherapy-for-multiple-viral-warts
#14
Jun Yeong Park, Bok Won Park, Eun Byul Cho, Eun Joo Park, Kwang Ho Kim, Kwang Joong Kim
BACKGROUND: Diphenylcyclopropenone (DPCP) immunotherapy for viral warts has been used for many years, but no studies have analyzed the treatment effects of DPCP alone, without the use of conventional therapy before immunotherapy. OBJECTIVES: We evaluated clinical efficacy of DPCP monotherapy compared to cryotherapy and pulsed dye laser (PDL) therapy. We also assessed the impact of initial sensitization on clinical response. METHODS: We retrospectively analyzed the medical records of 250 patients with multiple viral warts between January 2008 and December 2015...
March 1, 2018: Journal of Cutaneous Medicine and Surgery
https://www.readbyqxmd.com/read/29489813/generation-of-high-energy-kilohertz-rate-narrowband-tunable-ultraviolet-pulses-using-a-burst-mode-dye-laser-system
#15
Rongchao Pan, Ulrich Retzer, Thomas Werblinski, Mikhail N Slipchenko, Terrence R Meyer, Lars Zigan, Stefan Will
Typical commercial pulsed dye laser systems used in the generation of narrowband, tunable ultraviolet radiation for planar laser-induced fluorescence (PLIF) imaging are optimized for either high (∼5-10  kHz) repetition rates at comparatively low ultraviolet pulse energies (hundreds of microjoules) or high-output pulse energies (>10  mJ) at comparatively low repetition rates (∼10  Hz). In this work we use a frequency-doubled Nd:YAG burst-mode laser to pump a custom dye laser system for high pulse energies and repetition rates of 7...
March 1, 2018: Optics Letters
https://www.readbyqxmd.com/read/29489807/20-khz-ch-2-o-and-oh-plif-with-stereo-piv
#16
Stephen D Hammack, Campbell D Carter, Aaron W Skiba, Christopher A Fugger, Josef J Felver, Joseph D Miller, James R Gord, Tonghun Lee
Planar laser-induced fluorescence (PLIF) of hydroxyl (OH) and formaldehyde (CH2 O) radicals was performed alongside stereo particle image velocimetry (PIV) at a 20 kHz repetition rate in a highly turbulent Bunsen flame. A dual-pulse burst-mode laser generated envelopes of 532 nm pulse pairs for PIV as well as a pair of 355 nm pulses, the first of which was used for CH2 O PLIF. A diode-pumped solid-state Nd:YAG/dye laser system produced the excitation beam for the OH PLIF. The combined diagnostics produced simultaneous, temporally resolved two-dimensional fields of OH and CH2 O and two-dimensional, three-component velocity fields, facilitating the observation of the interaction of fluid dynamics with flame fronts and preheat layers...
March 1, 2018: Optics Letters
https://www.readbyqxmd.com/read/29475282/multi-wavelength-optical-data-processing-and-recording-based-on-azo-dyes-doped-organic-inorganic-hybrid-film
#17
Tianxi Gao, Yajie Xue, Zan Zhang, Wenxiu Que
While single wavelength all-optical information encoding through optically induced orientation of azobenzene dyes is being extensively pursued, we propose multi-wavelength optical data processing and recording based on disperse red 1 (DR1) and 4-(4-hydroxybutyloxy) azobenzene doped organic-inorganic hybrid films to increase the density of recording data. By investigating the change of absorbance spectrum of the doped film under different irradiations, results indicate a laser pulses around 470 nm would be suitable as the probe beam...
February 19, 2018: Optics Express
https://www.readbyqxmd.com/read/29461125/the-long-term-effect-of-pulsed-dye-laser-on-necrobiosis-lipoidica-a-case-study
#18
Emma Bergqvist, Gunnar Bergqvist
A 57-year-old female was presented with an irrepressible case of Necrobiosis Lipoidica considering the possibility of a surgical skin graft. Instead, a pulsed dye laser treatment was used as an alternate treatment. Previous case studies have been found in the literature on the effect of pulsed dye laser on Necrobiosis Lipoidica. The use of a pulsed dye laser in this case resulted in rendering the lesions asymptomatic for pain and a reduction in volume. Prolonged control was exhibited. From this case, we conclude that pulsed dye laser therapy is effective when increasing the number of treatments of laser therapy, and can be used as a treatment for Necrobiosis Lipoidica...
February 20, 2018: Journal of Cosmetic and Laser Therapy: Official Publication of the European Society for Laser Dermatology
https://www.readbyqxmd.com/read/29455565/pulsed-dye-laser-versus-intense-pulsed-light-in-melasma-a-split-face-comparative-study
#19
Arwa M Hassan, Nashwa N Elfar, Omnia M Rizk, Nahed Y Eissa
BACKGROUND: Recent reports suggest that melasma may have a vascular component. Vascular targeting lasers and light treatment can be a therapeutic option that will provide benefits to the patients. OBJECTIVES: To compare the efficacy and tolerability of pulsed dye laser (PDL) and intense pulsed light in treatment of melasma. PATIENTS AND METHODS: Twenty-eight Egyptian female patients with melasma were treated with PDL on the right hemiface (Group A) and with the intense pulsed light on the left hemiface (Group B)...
February 23, 2018: Journal of Dermatological Treatment
https://www.readbyqxmd.com/read/29444375/the-efficacy-and-safety-of-non-pharmacological-therapies-for-the-treatment-of-acne-vulgaris-a-systematic-review-and-best-evidence-synthesis
#20
F M C de Vries, A M Meulendijks, R J B Driessen, A A van Dooren, E P M Tjin, P C M van de Kerkhof
BACKGROUND: Acne vulgaris is a multifaceted skin disorder, affecting more than 85% of young individuals worldwide. Pharmacological therapy is not always desirable because of the development of antibiotic resistance or the potential risk of adverse effects. Non-pharmacological therapies can be viable alternatives for conventional therapies. However, sufficient evidence-based support in the efficacy and safety of non-pharmacological therapies is lacking. OBJECTIVE: To assess the efficacy and safety of several non-pharmacological therapies in the treatment of acne vulgaris...
February 14, 2018: Journal of the European Academy of Dermatology and Venereology: JEADV
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