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https://www.readbyqxmd.com/read/28719537/the-effect-of-slt-laser-application-on-iris-to-treat-sectorial-heterochromia-a-promising-technique
#1
Ayhan Basoglu, Uğur Çelik
The purpose of this study is to report a new and promising method for changing iris color in a sectorial heterochromia iridis patient. A 22-year-old man with a complaint of innate color disparity between his eyes presented to our clinic to seek medical advice. He underwent a comprehensive ophthalmic examination, including visual acuity, biomicroscopy, fundoscopy, intraocular pressure measurements, endothelial cell count, and evaluation of iridocorneal angle. The causes of acquired heterochromia were excluded...
July 14, 2017: Eye & Contact Lens
https://www.readbyqxmd.com/read/28708180/4d-spatiotemporal-evolution-of-combustion-intermediates-in-turbulent-flames-using-burst-mode-volumetric-laser-induced-fluorescence
#2
Benjamin R Halls, Naibo Jiang, Terrence R Meyer, Sukesh Roy, Mikhail N Slipchenko, James R Gord
High-speed (20 kHz rate), volumetric laser-induced-fluorescence imaging of combustion intermediates such as a formaldehyde (CH<sub>2</sub>O) and polycyclic aromatic hydrocarbon (PAH) species is demonstrated for tracking the four-dimensional (4D) evolution of turbulent flames. The third-harmonic, 355 nm output of a burst-mode Nd:YAG laser with a 130 mJ/pulse is expanded to 30 mm diameter for volume illumination of the base region of a methane-hydrogen jet diffusion flame. Eight simultaneous images from different viewing angles are used to collect the resulting fluorescence signal for reconstruction of 200 time-sequential three-dimensional volumes over 10 ms duration...
July 15, 2017: Optics Letters
https://www.readbyqxmd.com/read/28708162/high-energy-nd-yag-laser-system-with-arbitrary-sub-nanosecond-pulse-shaping-capability
#3
R A Meijer, A S Stodolna, K S E Eikema, S Witte
We report on a laser system capable of generating high-energy (>270  mJ) temporally shaped pulses at 1064 nm with 0.43-ns shaping resolution. The pulses are generated by modulation of a continuous-wave seed laser and subsequent amplification by a dual-stage grazing-incidence Nd:YVO4 "bounce" amplifier and a Nd:YAG power amplifier (all quasi-continuous diode-pumped). The system produces pulses with a high-quality top-hat spatial beam profile with up to 0.6 GW of peak power and 44 W of average power, a power stability of 0...
July 15, 2017: Optics Letters
https://www.readbyqxmd.com/read/28708155/adaptive-aberration-correction-of-a-5%C3%A2-%C3%A2-j-6-6%C3%A2-%C3%A2-ns-200%C3%A2-%C3%A2-hz-solid-state-nd-yag-laser
#4
Xin Yu, Lizhi Dong, Boheng Lai, Ping Yang, Shanqiu Chen, Wenjin Liu, Shuai Wang, Guomao Tang, Jisi Qiu, Zhijun Kang, Yueliang Liu, Hao Liu, Yong Liu, Zhongwei Fan, Bing Xu
In this Letter, we present an adaptive aberration correction system to simultaneously compensate for aberrations and reshaping the beams. A low-order aberration corrector is adapted. In this corrector, four lenses are mounted on a motorized rail, whose positions can be obtained using a ray tracing method based on the beam parameters detected by a wavefront sensor. After automatic correction, the PV value of the wavefront is reduced from 26.47 to 1.91 μm, and the beam quality β is improved from 18.42 to 2...
July 15, 2017: Optics Letters
https://www.readbyqxmd.com/read/28707034/randomized-controlled-trial-comparing-nd-yag-laser-photocoagulation-and-bipolar-electrocautery-in-the-management-of-epistaxis
#5
Jing Zhang, Luhong Cao, Chunsheng Wei
The objective of this study is to evaluate the efficacy and degree of comfort of Nd:YAG laser photocoagulation compared to bipolar electrocautery in the management of epistaxis. Seventy-two consecutive patients with a history of epistaxis were randomly assigned to receive treatment in an outpatient setting consisting of either bipolar electrocautery (group 1) or Nd:YAG laser photocoagulation (group 2). The study was conducted in university-affiliated teaching hospital. Seventy-two consecutive patients who suffered from anterior epistaxis and presented to the Otolaryngology Department at the Eye, Ear, Nose and Throat Hospital, Fudan University, between June 2015 and August 2015...
July 13, 2017: Lasers in Medical Science
https://www.readbyqxmd.com/read/28702973/clinical-and-histological-changes-in-hidradenitis-suppurativa-following-1064-nm-nd-yag-intralesional-laser-treatment
#6
N Zerbinati, E D'Este, L Ini, A Baruffato, V Premoli, A Calligaro, M Paulli
Hidradenitis Suppurativa (HS) is recently attracting much attention and awareness, often because it is misdiagnosed for years, restricting the therapeutic options. Moreover, this pathology arises in areas such as the inguinal region, that may cause embarrassment in young patients. Wrong diagnosis and delay in appropriate treatments lead to an exacerbation of the symptoms and a progression of the disease, which at the last stage can only be managed through extensive surgical excisions, ablation and vaporization of nodules with CO2 laser systems or aggressive chemotherapies such as anti-TNF-alpha like adalimumab (Humira®-AbbVie Inc...
July 13, 2017: Journal of Biological Regulators and Homeostatic Agents
https://www.readbyqxmd.com/read/28699676/influence-of-multi-wavelength-laser-irradiation-of-enamel-and-dentin-surfaces-at-0-355-2-94-and-9-4%C3%A2-%C3%AE-m-on-surface-morphology-permeability-and-acid-resistance
#7
Nai-Yuan N Chang, Jamison M Jew, Jacob C Simon, Kenneth H Chen, Robert C Lee, William A Fried, Jinny Cho, Cynthia L Darling, Daniel Fried
OBJECTIVE: Ultraviolet (UV) and infrared (IR) lasers can be used to specifically target protein, water, and mineral, respectively, in dental hard tissues to produce varying changes in surface morphology, permeability, reflectivity, and acid resistance. The purpose of this study was to explore the influence of laser irradiation and topical fluoride application on the surface morphology, permeability, reflectivity, and acid resistance of enamel and dentin to shed light on the mechanism of interaction and develop more effective treatments...
July 12, 2017: Lasers in Surgery and Medicine
https://www.readbyqxmd.com/read/28693690/clinical-evaluation-of-color-doppler-ultrasound-in-selecting-the-optimal-treatment-modality-for-infantile-hemangioma-%C3%A2
#8
Li Min, Liu Juan, Maya Valeska, Luo Dan, Zhou Bingrong
Objective We investigated the efficacy and safety of 1064 nm Nd: YAG laser, intense pulsed light (IPL), and lauromacrogol injection in the treatment of hemangioma, in order to evaluate the value of color Doppler ultrasound guidance in choosing the optimal treatment modality. Methods Infantile patients who were clinical diagnosed as hemangiomas were randomly divided into group A, who had color Doppler ultrasound examinations before the treatment, and group B who had the treatment without ultrasound evaluation...
June 10, 2017: Chinese Medical Sciences Journal, Chung-kuo i Hsüeh K'o Hsüeh Tsa Chih
https://www.readbyqxmd.com/read/28690515/a-case-of-facial-partial-unilateral-lentiginosis-treated-with-low-fluence-1-064-nm-q-switched-neodymium-doped-yttrium-aluminum-garnet-laser
#9
En Hyung Kim
Partial unilateral lentiginosis (PUL) is an unusual pigmentary disorder characterized by numerous lentigines grouped within an area of normal skin. Although treatment is not necessary, many patients with facial PUL seek medical help for cosmetic reasons. There is no established standard treatment for PUL. Conventional lasers may cause postinflammatory hyperpigmentation because keratinocytes are injured during the process. Also, scarring, long downtime, and pain are important issues. A 19-year-old patient with facial PUL was successfully treated with low-fluence 1,064-nm Q-switched neodymium-doped yttrium aluminum garnet (QS Nd:YAG) laser...
May 2017: Case Reports in Dermatology
https://www.readbyqxmd.com/read/28684320/focal-choroidal-excavation-and-a-traumatic-macular-hole-secondary-to-accidental-q-switched-nd-yag-laser
#10
Yuanlu Shuai, Xianglei Chen, Wangyi Fang, Jia Li, Weizhong Ge, Songtao Yuan, Qinghuai Liu
Today, the widespread use of laser instruments in various fields has resulted in many accidental retinal injuries. Here we describe a rare clinical case of full-thickness macular hole (MH) and focal choroidal excavation (FCE) caused by a 1064-nm Q-switched Nd:YAG laser. After pars plana vitrectomy and the following 14 months, consecutive optical coherence tomography imagings showed closure of the MH. Visual acuity improved even in the absence of the outer retina and in the presence of FCE. We speculate that different focusing effects of the unexpected Nd:YAG laser which target different levels of retinal tissue generates diverse prognosis...
July 3, 2017: Photodiagnosis and Photodynamic Therapy
https://www.readbyqxmd.com/read/28682146/treatment-of-caf%C3%A3-au-lait-macules-with-a-high-fluenced-1-064-nm-q-switched-neodymium-yttrium-aluminum-garnet-laser
#11
Jiehoon Kim, Hoon Hur, Yu Ri Kim, Sung Bin Cho
Café-au-lait macules (CALMs) are light to dark brown macules or patches of increased melanin concentration found along the dermoepidermal junction. Although many attempts to treat CALMs using various kinds of laser/light-based devices have been reported, CALMs remain refractory thereto with high recurrence rates. In this case series, we describe four patients with idiopathic CALMs that were effectively and safely treated with a non-ablative, high-fluenced, Q-switched (QS), 1,064-nm neodymium:yttrium aluminum garnet (Nd:YAG) laser...
July 6, 2017: Journal of Cosmetic and Laser Therapy: Official Publication of the European Society for Laser Dermatology
https://www.readbyqxmd.com/read/28673052/synthesis-of-electrical-conductive-silica-nanofiber-gold-nanoparticle-composite-by-laser-pulses-and-sputtering-technique
#12
Sarah Hamza, Anna Ignaszak, Amirkianoosh Kiani
Biocompatible-sensing materials hold an important role in biomedical applications where there is a need to translate biological responses into electrical signals. Increasing the biocompatibility of these sensing devices generally causes a reduction in the overall conductivity due to the processing techniques. Silicon is becoming a more feasible and available option for use in these applications due to its semiconductor properties and availability. When processed to be porous, it has shown promising biocompatibility; however, a reduction in its conductivity is caused by its oxidization...
December 2017: Nanoscale Research Letters
https://www.readbyqxmd.com/read/28669429/hybrid-photoacoustic-ultrasound-tomograph-for-real-time-finger-imaging
#13
Milan Oeri, Wolfgang Bost, Nicolas Sénégond, Steffen Tretbar, Marc Fournelle
We report a target-enclosing, hybrid tomograph with a total of 768 elements based on capacitive micromachined ultrasound transducer technology and providing fast, high-resolution 2-D/3-D photoacoustic and ultrasound tomography tailored to finger imaging. A freely programmable ultrasound beamforming platform sampling data at 80 MHz was developed to realize plane wave transmission under multiple angles. A multiplexing unit enables the connection and control of a large number of elements. Fast image reconstruction is provided by GPU processing...
June 29, 2017: Ultrasound in Medicine & Biology
https://www.readbyqxmd.com/read/28667507/endoluminal-nd-yag-laser-application-in-ex-vivo-biliary-porcine-tissue
#14
Roberta Rea, Francesco Maria Di Matteo, Margareth Martino, Monica Pandolfi, Paola Saccomandi, Carla Rabitti, Anna Crescenzi, Guido Costamagna
Adequate biliary drainage with endoscopic or percutaneous placement of self-expandable metal stents represents the goal of palliation in patients with inoperable malignant obstruction of the biliary tree. As an adjunct to stenting, various tissue ablation treatments have been proposed with conflicting results. The aim of this study was to test the effect on biliary tissue of a new ablation technique based on Nd:YAG laser light delivery. The study was conducted on ex vivo specimens of 18 healthy farm pigs, using cystic ducts that are the simplest biliary structures to isolate and cannulate ex vivo...
June 30, 2017: Lasers in Medical Science
https://www.readbyqxmd.com/read/28666611/treatment-of-xanthelasma-palpebrarum-with-a-1064-nm-q-switched-nd-yag-laser
#15
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/28665155/effects-of-high-power-pulsed-nd-yag-laser-irradiation-on-the-release-of-transforming-growth-factor-beta-tgf-%C3%AE-and-vascular-endothelial-growth-factor-vegf-from-human-gingival-fibroblasts
#16
Mehmet Sağlam, Serhat Köseoğlu, Tuğba Pekbağrıyanık, Levent Savran, Şükrü Enhoş
The purpose of this study was to investigate the effect of different high power energy settings of a Nd:YAG laser (1064-nm) on cell viability of human gingival fibroblasts and release of transforming growth factor-beta (TGF-β) and vascular endothelial growth factor (VEGF) on these cells. Gingival fibroblasts (GF) were isolated from human gingival connective tissue during crown lengthening procedure. GF were irradiated with different laser parameters as follows; group 1: 1 W (100 mj, 10 Hz) 10 s, group 2: 1,5 W (150 mj, 10 Hz) 10 s, group 3: 2 W (200mj, 10 Hz) 10 s, group 4: 1 W (100 mj, 10 Hz) 20 s, group 5: 1,5 W (150 mj, 10 Hz) 20 s, group 6: 2 W (200mj, 10 Hz) 20 s...
June 30, 2017: Journal of Cosmetic and Laser Therapy: Official Publication of the European Society for Laser Dermatology
https://www.readbyqxmd.com/read/28662404/novel-laser-induced-photoacoustic-spectroscopy-for-instantaneous-trace-detection-of-explosive-materials
#17
Yasser H El-Sharkawy, Sherif Elbasuney
Laser photoacoustic spectroscopy (LPAS) is an attractive technology in terms of simplicity, ruggedness, and overall sensitivity; it detects the time dependent heat generated (thermo-elastic effect) in the target via interaction with pulsed optical radiation. This study reports on novel LPAS technique that offers instant and standoff detection capabilities of trace explosives. Over the current study, light is generated using pulsed Q-switched Nd:YAG laser; the generated photoacoustic response in stimulated explosive material offers signature values that depend on the optical, thermal, and acoustical properties...
June 15, 2017: Forensic Science International
https://www.readbyqxmd.com/read/28657379/a-new-imaging-technique-for-assessment-of-the-effectiveness-of-long-pulse-nd-yag-532-nm-laser-in-treatment-of-facial-port-wine-stain
#18
Murtadha Hashim Al-Janabi, Noor Taha Ismaeel Ali, Karrar Dheiaa Mohammed, Muhsin A Al-Dhalimi, Sahib Neamh Abdul Wahid
BACKGROUND: PWS is a vascular malformation presented at birth and associated with a psychological problem to the patients. Many types the laser systems were used to solve this problem. AIM OF THE STUDY: to assess the efficacy of long-pulsed Nd:YAG 532 nm for the treatment of port wine stain both clinically and by imaging technique. PATIENTS AND METHODS: This is an Interventional therapeutic clinical study for the treatment of facial port-twine stain with long-pulsed, 532nm, Nd:YAG laser...
June 28, 2017: Journal of Cosmetic and Laser Therapy: Official Publication of the European Society for Laser Dermatology
https://www.readbyqxmd.com/read/28657378/a-split-face-investigator-blinded-comparative-study-on-the-efficacy-and-safety-of-q-switched-nd-yag-laser-plus-microneedling-with-vitamin-c-versus-q-switched-nd-yag-laser-for-the-treatment-of-recalcitrant-melasma
#19
Pelin Ustuner, Ali Balevi, Mustafa Ozdemir
BACKGROUND: High recurrence has previously been reported in the treatment of melasma with low-fluence 1,064-nm QS-Nd:YAG laser. However, the efficacy and safety of QS-Nd:YAG laser plus microneedling with vitamin C has not been evaluated in patients with mixed-type melasma. MATERIAL AND METHODS: Sixteen patients with recalcitrant dermal- or mixed-type melasma were included in the study. One side of patients' face was treated with QS-Nd:YAG plus microneedling with vitamin C (Group A) and the other side with QS-Nd:YAG alone (Group B) for four sessions at four-week intervals...
June 28, 2017: Journal of Cosmetic and Laser Therapy: Official Publication of the European Society for Laser Dermatology
https://www.readbyqxmd.com/read/28649459/the-study-on-force-surface-integrity-tool-life-and-chip-on-laser-assisted-machining-of-inconel-718-using-nd-yag-laser-source
#20
K Venkatesan
Inconel 718, a high-temperature alloy, is a promising material for high-performance aerospace gas turbine engines components. However, the machining of the alloy is difficult owing to immense shear strength, rapid work hardening rate during turning, and less thermal conductivity. Hence, like ceramics and composites, the machining of this alloy is considered as difficult-to-turn materials. Laser assisted turning method has become a promising solution in recent years to lessen cutting stress when materials that are considered difficult-to-turn, such as Inconel 718 is employed...
July 2017: Journal of Advanced Research
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