The Experts below are selected from a list of 135 Experts worldwide ranked by ideXlab platform
Kenneth L Knight - One of the best experts on this subject based on the ideXlab platform.
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temperature measurement reliability and validity with thermocouple Extension Leads or changing Lead temperature
Journal of Athletic Training, 2010Co-Authors: Lisa S Jutte, Blaine C Long, Kenneth L KnightAbstract:Abstract Context: Thermocouples' Leads are often too short, necessitating the use of an Extension Lead. Objective: To determine if temperature measures were influenced by Extension-Lead use or Lead...
Ming-jia Li - One of the best experts on this subject based on the ideXlab platform.
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influence of Extension Lead and input polarization state on performance of quarter wave plate made by increscent spinning birefringent fiber
Proceedings of SPIE, 2008Co-Authors: Minning Ji, Ming-jia LiAbstract:ABSTRACT The influence of Extension Lead at both sides and input polarization state on polarization transform performance of increscent-spinning birefringent fibre is calculated and examined. In the Extension Lead, the output polarization state is fluctuating with period relevant with the max-spin-rate or the beat length of birefringent fiber. It is found, the optimal input polarization state for the best output linear polarization is not the ideal circular polarization but a elliptical polarization related with the maximum spin rate, the optimal input linear polarization orientation is not in line but has a slight divergence angle with the birefringent axes of fiber, and if the input linear polarization is not perfect linear polarization, the output circular polarization would be nonlinearly degraded. These results have advisable meaning for the design, test and evaluation of the quarter wave plate made by the increscent-spinning birefringent fibre. Keywords: Birefringent fibre, beat length, polarization transform, spin rate, state of polarization, Extension Lead, increscent-spinning, Jones matrix
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Polarization transforming performance of increscent spinning birefringent fiber with Extension Lead and different input polarization state
2008 Asia Optical Fiber Communication & Optoelectronic Exposition & Conference, 2008Co-Authors: Ming-jia Li, Hua ChenAbstract:The polarization transformation of increscent-spinning birefringent fiber with Extension Lead is simulated. Periodical fluctuation in Extension Lead, optimal input polarization orientation and nonlinearly degradation with imperfection of input polarization state have been found and discussed.
Lisa S Jutte - One of the best experts on this subject based on the ideXlab platform.
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temperature measurement reliability and validity with thermocouple Extension Leads or changing Lead temperature
Journal of Athletic Training, 2010Co-Authors: Lisa S Jutte, Blaine C Long, Kenneth L KnightAbstract:Abstract Context: Thermocouples' Leads are often too short, necessitating the use of an Extension Lead. Objective: To determine if temperature measures were influenced by Extension-Lead use or Lead...
David J. Mikulis - One of the best experts on this subject based on the ideXlab platform.
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Thalamic stimulation and functional magnetic resonance imaging: localization of cortical and subcortical activation with implanted electrodes. Technical note.
Journal of Neurosurgery, 1999Co-Authors: Ali R. Rezai, Andres M. Lozano, Adrian P. Crawley, Karen D. Davis, Chun L. Kwan, Jonathan O. Dostrovsky, Ronald R. Tasker, David J. MikulisAbstract:✓ The utility of functional magnetic resonance (fMR) imaging in patients with implanted thalamic electrodes has not yet been determined. The aim of this study was to establish the safety of performing fMR imaging in patients with thalamic deep brain stimulators and to determine the value of fMR imaging in detecting cortical and subcortical activity during stimulation. Functional MR imaging was performed in three patients suffering from chronic pain and two patients with essential tremor. Two of the three patients with pain had undergone electrode implantation in the thalamic sensory ventralis caudalis (Vc) nucleus and the other had undergone electrode implantation in both the Vc and the periventricular gray (PVG) matter. Patients with tremor underwent electrode implantation in the ventralis intermedius (Vim) nucleus. Functional MR imaging was performed during stimulation by using a pulse generator connected to a transcutaneous Extension Lead. Clinically, Vc stimulation evoked paresthesias in the contralat...
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Thalamic stimulation and functional magnetic resonance imaging: localization of cortical and subcortical activation with implanted electrodes: Technical note
Neurosurgical Focus, 1999Co-Authors: Ali R. Rezai, Andres M. Lozano, Adrian P. Crawley, Karen D. Davis, Chun L. Kwan, Jonathan O. Dostrovsky, Ronald R. Tasker, David J. MikulisAbstract:The utility of functional magnetic resonance (fMR) imaging in patients with implanted thalamic electrodes has not yet been determined. The aim of this study was to establish the safety of performing fMR imaging in patients with thalamic deep brain stimulators and to determine the value of fMR imaging in detecting cortical and subcortical activity during stimulation. Functional MR imaging was performed in three patients suffering from chronic pain and two patients with essential tremor. Two of the three patients with pain had undergone electrode implantation in the thalamic sensory ventralis caudalis (Vc) nucleus and the other had undergone electrode implantation in both the Vc and the periventricular gray (PVG) matter. Patients with tremor underwent electrode implantation in the ventralis intermedius (Vim) nucleus. Functional MR imaging was performed during stimulation by using a pulse generator connected to a transcutaneous Extension Lead. Clinically, Vc stimulation evoked paresthesias in the contralateral body, PVG stimulation evoked a sensation of diffuse internal body warmth, and Vim stimulation caused tremor arrest. Functional images were acquired using a 1.5-tesla MR imaging system. The Vc stimulation at intensities provoking paresthesias resulted in activation of the primary somatosensory cortex (SI). Stimulation at subthreshold intensities failed to activate the SI. Additional stimulation-coupled activation was observed in the thalamus, the secondary somatosensory cortex (SII), and the insula. In contrast, stimulation of the PVG electrode did not evoke paresthesias or activate the SI, but resulted in medial thalamic and cingulate cortex activation. Stimulation in the Vim resulted in thalamic, basal ganglia, and SI activation. An evaluation of the safety of the procedure indicated that significant current could be induced within the electrode if a faulty connecting cable (defective insulation) came in contact with the patient. Simple precautions, such as inspection of wires for fraying and prevention of their contact with the patient, enabled the procedure to be conducted safely. Clinical safety was further corroborated by performing 86 MR studies in patients in whom electrodes had been implanted with no adverse clinical effects. This is the first report of the use of fMR imaging during stimulation with implanted thalamic electrodes. The authors' findings demonstrate that fMR imaging can safely detect the activation of cortical and subcortical neuronal pathways during stimulation and that stimulation does not interfere with imaging. This approach offers great potential for understanding the mechanisms of action of deep brain stimulation and those underlying pain and tremor generation.
Hua Chen - One of the best experts on this subject based on the ideXlab platform.
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Polarization transforming performance of increscent spinning birefringent fiber with Extension Lead and different input polarization state
2008 Asia Optical Fiber Communication & Optoelectronic Exposition & Conference, 2008Co-Authors: Ming-jia Li, Hua ChenAbstract:The polarization transformation of increscent-spinning birefringent fiber with Extension Lead is simulated. Periodical fluctuation in Extension Lead, optimal input polarization orientation and nonlinearly degradation with imperfection of input polarization state have been found and discussed.