keyword
MENU ▼
Read by QxMD icon Read
search

laser doppler

keyword
https://www.readbyqxmd.com/read/29054109/influence-of-backside-loading-on-the-floating-mass-transducer-an-in-vitro-experimental-study
#1
Antoniu-Oreste Gostian, Martin Sylvester Otte, David Pazen, Magdalene Ortmann, David Schwarz, Karl Bernd Hüttenbrink, Dirk Beutner
HYPOTHESIS: The vibration of the floating mass transducer (FMT) of a single active middle-ear implant (AMEI) is distinctly influenced by the properties of the material coupled to its back side. BACKGROUND: In round window vibroplasty, the FMT needs to be padded against the surrounding bone opposite from the round window membrane. This represents one factor influencing its performance as a round window driver. Therefore, we examined the effects of different materials linked to the back side of an FMT on its vibration range...
October 20, 2017: Clinical Otolaryngology
https://www.readbyqxmd.com/read/29043544/icp-versus-laser-doppler-cerebrovascular-reactivity-indices-to-assess-brain-autoregulatory-capacity
#2
F A Zeiler, J Donnelly, D Cardim, D K Menon, P Smielewski, M Czosnyka
BACKGROUND: To explore the relationship between various autoregulatory indices in order to determine which approximate small vessel/microvascular (MV) autoregulatory capacity most accurately. METHODS: Utilizing a retrospective cohort of traumatic brain injury patients (N = 41) with: transcranial Doppler (TCD), intracranial pressure (ICP) and cortical laser Doppler flowmetry (LDF), we calculated various continuous indices of autoregulation and cerebrovascular responsiveness: A...
October 17, 2017: Neurocritical Care
https://www.readbyqxmd.com/read/29041920/intraoperative-continuous-cerebral-microcirculation-measurement-in-patients-with-aneurysmal-subarachnoid-hemorrhage-preliminary-data-on-the-early-administration-of-magnesium-sulfate
#3
Bjoern Sommer, Cornelia S Weidinger, Dennis Wolf, Michael Buchfelder, Hubert Schmitt
BACKGROUND: In patients with subarachnoid hemorrhage (SAH), vasospasm remains one of the major complications. The application of intravenous magnesium sulfate (MgSO4) has been under discussion to prevent cerebral ischemia. Our aim was to examine the impact of early MgSO4 administration on local cerebral microcirculation during microsurgical clipping of SAH-related aneurysms. METHODS: The non-invasive laser-Doppler spectrophotometry system "Oxygen-to-See (O2C)" was used in 14 consecutive patients (11 female, 3 male, median age 56...
October 17, 2017: BMC Anesthesiology
https://www.readbyqxmd.com/read/29041745/1-5-%C3%AE-m-polarization-coherent-lidar-incorporating-time-division-multiplexing
#4
Chong Wang, Haiyun Xia, Mingjia Shangguan, Yunbin Wu, Lu Wang, Lijie Zhao, Jiawei Qiu, Renjun Zhang
Atmospheric depolarization ratio and wind velocity are measured simultaneously by a single versatile coherent Doppler lidar (CDL). Backscattering components at parallel and perpendicular polarization states are obtained by using a single balanced detector, adopting time-division multiplexing technique. Thus systematic error induced by the non-uniform response of different detectors in traditional lidars is avoided. The operation mode of the instrument can be switched from polarization CDL to traditional CDL by the user depending on atmospheric conditions and desired performance...
August 21, 2017: Optics Express
https://www.readbyqxmd.com/read/29041219/stability-of-period-one-p1-oscillations-generated-by-semiconductor-lasers-subject-to-optical-injection-or-optical-feedback
#5
Lyu-Chih Lin, Ssu-Hsin Liu, Fan-Yi Lin
We study the stability of period-one (P1) oscillations experimentally generated by semiconductor lasers subject to optical injection (OI) and by those subject to optical feedback (OF). With unique advantages of broad frequency tuning range and large sideband rejection ratio, P1 oscillations can be useful in applications such as photonic microwave generation, radio-over-fiber communication, and laser Doppler velocimeter. The stability of the P1 oscillations is critical for these applications, which can be affected by spontaneous emission and fluctuations in both temperature and injection current...
October 16, 2017: Optics Express
https://www.readbyqxmd.com/read/29041039/direct-comb-molecular-spectroscopy-by-heterodyne-detection-with-continuous-wave-laser-for-high-sensitivity
#6
Taro Hasegawa, Hiroyuki Sasada
We have demonstrated direct-comb molecular spectroscopy in which an individual-comb mode is resolved by heterodyne detection with a continuous-wave (cw) laser. This simple, fast, and sensitive technique was demonstrated for atomic spectroscopy in [ Appl. Phys. Lett.101, 051105 ( 2012)], but is more suitable for molecular spectroscopy. Four rotation-vibration transitions of methane have simultaneously been recorded in a Doppler-limited resolution using a spectrally broadened comb based on an Er-doped fiber laser and a cw 1651-nm distributed-feedback laser diode...
August 7, 2017: Optics Express
https://www.readbyqxmd.com/read/29036796/intestinal-ischemia-reperfusion-leads-to-early-systemic-micro-rheological-and-multiorgan-microcirculatory-alterations-in-the-rat
#7
Anita Mester, Zsuzsanna Magyar, Viktoria Sogor, Bence Tanczos, Yoav Stark, Konstantin Cherniavsky, Laszlo Bidiga, Katalin Peto, Norbert Nemeth
BACKGROUND: Intestinal ischemia-reperfusion (I/R) is a potentially life-threatening situation and its pathomechanism is not fully understood yet. OBJECTIVE: To investigate the early micro-rheological, microcirculatory and morphological consequences of intestinal I/R in a rat model. METHODS: CD rats were anesthetized and subjected to Control (n = 7) or I/R (n = 7) groups. Left femoral artery cannulation and median laparotomy were performed...
October 7, 2017: Clinical Hemorheology and Microcirculation
https://www.readbyqxmd.com/read/29034542/time-frequency-analysis-of-increases-in-vaginal-blood-perfusion-elicited-by-long-duration-pudendal-neuromodulation-in-anesthetized-rats
#8
Indie C Rice, Lauren L Zimmerman, Shani E Ross, Mitchell B Berger, Tim M Bruns
OBJECTIVES: Female sexual dysfunction (FSD) affects a significant portion of the population. Although treatment options for FSD are limited, neuromodulation for bladder dysfunction has improved sexual function in some women. A few studies have investigated peripheral neuromodulation for eliciting changes in vaginal blood flow, as a proxy for modulating genital sexual arousal, however results are generally transient. Our central hypothesis is that repeated or extended-duration pudendal nerve stimulation can elicit maintained vaginal blood flow increases...
October 16, 2017: Neuromodulation: Journal of the International Neuromodulation Society
https://www.readbyqxmd.com/read/29034283/endovenous-laser-ablation-of-spermatic-vein-for-the-treatment-of-varicocele
#9
Antonio Basile, Alessandro Motta, Giovanni Failla, Giuseppe Caltabiano, Marco Pizzarelli, Cecilia Gozzo, Davide Castiglione, Stefano Palmucci
INTRODUCTION: Varicocele is a relatively complex pathology of the scrotum veins', known to be one of the easiest to treat. Modern treatment involves both surgical (open, laparoscopic and microsurgery) and interventional approach (either with coils and/or sclerosant injection). Our aim is to demonstrate the feasibility and the reliability of endovenous laser ablation (EVLA) of the spermatic vein for the treatment of varicocele. MATERIALS AND METHODS: We consecutively and prospectively treated 11 patients (age range 24-45 years old, mean 31y) with left varicocele, phlebografically classified as Bahren type I and with indication for percutaneous treatment...
2017: European Journal of Radiology Open
https://www.readbyqxmd.com/read/29032975/comparison-of-non-surgical-methods-for-the-treatment-of-deep-partial-thickness-skin-burns-of-the-hand
#10
Ernest Zacharevskij, Gytis Baranauskas, Karolis Varkalys, Rytis Rimdeika, Darius Kubilius
This paper describes a randomized, controlled, parallel-group, single-center clinical trial designed to compare non surgical treatment methods of deep partial thickness skin burns of the hand. All patients were scanned with the Laser Doppler Imaging device to determine the depth of the burn wound. Viable keratinocytes sites were determined according to the established Perfusion Units (PU) measurement system. The trial enrolled 87 patients with hand burn wounds in the section of 260-600PU. Hand burn patients were divided into the following four groups: treated with hydrocolloid dressings; treated with mechanical debridement of monofilament polyester fibers pad and then applying silver sulfadiazine; treated with gauze dressings containing enzymatic collagenase preparation...
October 9, 2017: Burns: Journal of the International Society for Burn Injuries
https://www.readbyqxmd.com/read/29032974/prospective-comparative-evaluation-study-of-laser-doppler-imaging-and-thermal-imaging-in-the-assessment-of-burn-depth
#11
Christopher Wearn, Kwang Chear Lee, Joseph Hardwicke, Ammar Allouni, Amy Bamford, Peter Nightingale, Naiem Moiemen
INTRODUCTION: The accurate assessment of burn depth is challenging but crucial for surgical excision and tissue preservation. Laser Doppler Imaging (LDI) has gained increasing acceptance as a tool to aid depth assessment but its adoption is hampered by high costs, long scan times and limited portability. Thermal imaging is touted as a suitable alternative however few comparison studies have been done. METHODS: Sixteen burn patients with 52 regions of interests were analysed...
October 9, 2017: Burns: Journal of the International Society for Burn Injuries
https://www.readbyqxmd.com/read/29029857/the-clinical-utility-of-extracorporeal-shock-wave-therapy-for-burn-pruritus-a-prospective-randomized-single-blind-study
#12
So Young Joo, Yoon Soo Cho, Cheong Hoon Seo
PURPOSES: To investigate the effect and mechanisms of extracorporeal shock wave therapy (ESWT) on burn scar pruritus. METHODS: Forty-six patients participated (experimental group, n=23; sham stimulation group, n=23). Patients had complaints of severe pruritus ranging from 5 to 10 on the visual analog scale. The experimental group received 1000-2000 shock waves for each treatment with 100 impulses/cm(2), each with low-energy flux density (0.05-0.20mJ/mm(2)) and a 1-week interval between treatments for 3 weeks...
October 10, 2017: Burns: Journal of the International Society for Burn Injuries
https://www.readbyqxmd.com/read/29027158/isq-calculation-evaluation-of-in-vitro-laser-scanning-vibrometry-captured-resonance-frequency
#13
Stijn Debruyne, Nicolas Grognard, Gino Verleye, Korneel Van Massenhove, Dimitrios Mavreas, Bart Vande Vannet
BACKGROUND: Implant stability testing at various stages of implant therapy by means of resonance frequency analysis is extensively used. The overall measurement outcome is a function of the resulting stiffness of three entities: surrounding bone, bone-implant complex, and implant-Smartpeg complex. The influence of the latter on the overall measurement results is presently unknown. It can be investigated in vitro by use of imbedded implants with mounted Smartpegs. This enables to keep the influence of the two other entities constant and controlled...
October 12, 2017: International Journal of Implant Dentistry
https://www.readbyqxmd.com/read/29019582/ultrasound-guided-foam-sclerotherapy-for-severe-chronic-venous-insufficiency
#14
Guilherme Camargo Gonçalves de-Abreu, Otacílio de Camargo, Márcia Fayad Marcondes de-Abreu, José Luís Braga de-Aquino
Chronic venous insufficiency is characterized by cutaneous alterations caused by venous hypertension; in severe forms, it progresses to lower limb ulcers. Lower limb varicose veins are the main cause of chronic venous insufficiency, and the classic treatment includes surgery and compressive therapy. Minimally invasive alternative treatments for varicose veins include new techniques such as venous thermal ablation using laser or radiofrequency. The use of different methods depends on clinical and anatomical factors...
September 2017: Revista do Colégio Brasileiro de Cirurgiões
https://www.readbyqxmd.com/read/29019179/vessel-packaging-effect-in-laser-speckle-contrast-imaging-and-laser-doppler-imaging
#15
Ingemar Fredriksson, Marcus Larsson
Laser speckle-based techniques are frequently used to assess microcirculatory blood flow. Perfusion estimates are calculated either by analyzing the speckle fluctuations over time as in laser Doppler flowmetry (LDF), or by analyzing the speckle contrast as in laser speckle contrast imaging (LSCI). The perfusion estimates depend on the amount of blood and its speed distribution. However, the perfusion estimates are commonly given in arbitrary units as they are nonlinear and depend on the magnitude and the spatial distribution of the optical properties in the tissue under investigation...
October 2017: Journal of Biomedical Optics
https://www.readbyqxmd.com/read/28992171/points-to-consider-for-skin-ulcers-in-systemic-sclerosis
#16
REVIEW
Felice Galluccio, Yannick Allanore, Lázló Czirjak, Daniel E Furst, Dinesh Khanna, Marco Matucci-Cerinic
This article discusses points to consider when undertaking a clinical trial to test therapy for skin ulcers in SSc. A validated definition of skin ulcers should be used if available. Defining a uniform SSc patient population, including consideration of disease duration, history of digital ulcers and capillaroscopic patterns, is important. Excluding confounding factors such as infection, calcinosis and trauma should be strongly considered, or at least accounted for, in defining patients. Outcome measures such as time to healing, prevention of new ulcers, function, pain and objective measures such as US, laser Doppler and thermography can be considered as outcome measures, although their validation has not yet been achieved and efforts may be needed to validate them before use...
September 1, 2017: Rheumatology
https://www.readbyqxmd.com/read/28992170/points-to-consider-raynaud-s-phenomenon-in-systemic-sclerosis
#17
REVIEW
Maurizio Cutolo, Vanessa Smith, Daniel E Furst, Dinesh Khanna, Ariane L Herrick
RP is an exaggerated vasospastic response to cold or emotion. Randomized, double-blind, placebo-controlled trials with either parallel group or cross-over trials should be mainly considered. Cross-over design, which is good for early phase trials of immediate or very short-term outcomes, is important in a condition as heterogeneous as RP: a wash-out period between treatment arms should always be included to minimize the possibility of a period (carry-over) effect. Duration of RP trials is usually constrained by the need to complete these over a single season, usually winter when the weather is colder...
September 1, 2017: Rheumatology
https://www.readbyqxmd.com/read/28988445/effect-of-cochlear-implantation-on-middle-ear-function-a-three-month-prospective-study
#18
Joseph D Wasson, Luke Campbell, Scott Chambers, Amy Hampson, Robert J S Briggs, Stephen J O'Leary
OBJECTIVES/HYPOTHESIS: To determine if cochlear implantation has a delayed effect on the middle ear conductive hearing mechanism by measuring laser Doppler vibrometry (LDV) of the tympanic membrane (TM) in both implanted and contralateral control ears preoperatively and 3 months postoperatively, and then comparing the relative change in LDV outcome measures between implanted and control ears. STUDY DESIGN: Prospective cohort study. METHODS: Eleven preoperative adult unilateral cochlear implant recipients in previously unoperated ears with normal anatomy and aerated temporal bones were included in this study...
October 8, 2017: Laryngoscope
https://www.readbyqxmd.com/read/28987101/conjugating-precision-and-acquisition-time-in-a-doppler-broadening-regime-by-interleaved-frequency-agile-rapid-scanning-cavity-ring-down-spectroscopy
#19
Riccardo Gotti, Davide Gatti, Piotr Masłowski, Marco Lamperti, Michele Belmonte, Paolo Laporta, Marco Marangoni
We propose a novel approach to cavity-ring-down-spectroscopy (CRDS) in which spectra acquired with a frequency-agile rapid-scanning (FARS) scheme, i.e., with a laser sideband stepped across the modes of a high-finesse cavity, are interleaved with one another by a sub-millisecond readjustment of the cavity length. This brings to time acquisitions below 20 s for few-GHz-wide spectra composed of a very high number of spectral points, typically 3200. Thanks to the signal-to-noise ratio easily in excess of 10 000, each FARS-CRDS spectrum is shown to be sufficient to determine the line-centre frequency of a Doppler broadened line with a precision of 2 parts over 10(11), thus very close to that of sub-Doppler regimes and in a few-seconds time scale...
October 7, 2017: Journal of Chemical Physics
https://www.readbyqxmd.com/read/28986690/the-role-of-shear-stress-on-cutaneous-microvascular-endothelial-function-in-humans
#20
Gary J Hodges, Desmond G Stewart, Paul J Davison, Stephen S Cheung
PURPOSE: Previous studies suggest that exercise and heat stress improve cutaneous endothelial function, caused by increases in shear stress. However, as vasodilatation in the skin is primarily a thermogenic phenomenon, we investigated if shear stress alone without increases in skin temperature that occur with exercise and heat stress increases endothelial function. We examined the hypothesis that repeated bouts of brief occlusion would improve cutaneous endothelial function via shear stress-dependent mechanisms...
October 6, 2017: European Journal of Applied Physiology
keyword
keyword
32980
1
2
Fetch more papers »
Fetching more papers... Fetching...
Read by QxMD. Sign in or create an account to discover new knowledge that matter to you.
Remove bar
Read by QxMD icon Read
×

Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"