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1.
Opt Express ; 29(14): 22315-22330, 2021 Jul 05.
Artículo en Inglés | MEDLINE | ID: mdl-34265999

RESUMEN

We present a fast-scanning Fourier transform spectrometer (FTS) in combination with high-repetition-rate mid-infrared supercontinuum sources, covering a wavelength range of 2-10.5 µm. We demonstrate the performance of the spectrometer for trace gas detection and compare various detection methods: baseband detection with a single photodetector, baseband balanced detection, and synchronous demodulation at the repetition rate of the supercontinuum source. The FTS uses off-the-shelf optical components and provides a minimum spectral resolution of 750 MHz. It achieves a noise equivalent absorption sensitivity of ∼10-6 cm-1 Hz-1/2 per spectral element, by using a 31.2 m multipass absorption cell.

2.
Eur J Neurol ; 27(5): 900-902, 2020 05.
Artículo en Inglés | MEDLINE | ID: mdl-32064742

RESUMEN

BACKGROUND AND PURPOSE: We analyzed the incidence and causes of oral anticoagulant (OAC) cessation and subsequent stroke after OAC withdrawal in a cohort of Korean stroke patients with atrial fibrillation. METHODS: The Korean Atrial Fibrillation Evaluation Registry in Ischemic Stroke patients (K-ATTENTION) is a multicenter cohort study, merging stroke registries from 11 tertiary centers in Korea. The number of OAC interruption episodes and the reasons were reviewed from hospital records. Stroke after OAC withdrawal was defined when a patient experienced ischaemic stroke within 31 days after OAC withdrawal. Clinical variables were compared between patients who experienced stroke recurrence during OAC interruption and those who did not experience recurrence. RESULTS: Among 3213 stroke patients with atrial fibrillation, a total of 329 episodes of OAC interruption were detected in 229 patients after index stroke (mean age 72.9 ± 8.3 years, 113 female patients). The most frequent reason for OAC withdrawal was poor compliance [103 episodes (31.3%)] followed by extracranial bleeding [96 episodes (29.2%)]. Stroke after OAC withdrawal was noted in 13 patients. Mean age, vascular risk factor profile and mean CHA2 DS2 -VASc score were not significantly different between patients with and without recurrent stroke. CONCLUSIONS: A considerable number of stroke patients with atrial fibrillation experienced temporary interruption of OAC after index stroke, which was associated with stroke recurrence of 4.0 cases per 100 interruption episodes.


Asunto(s)
Fibrilación Atrial , Isquemia Encefálica , Accidente Cerebrovascular , Administración Oral , Anciano , Anciano de 80 o más Años , Anticoagulantes/uso terapéutico , Fibrilación Atrial/complicaciones , Fibrilación Atrial/tratamiento farmacológico , Fibrilación Atrial/epidemiología , Isquemia Encefálica/complicaciones , Isquemia Encefálica/tratamiento farmacológico , Isquemia Encefálica/epidemiología , Estudios de Cohortes , Femenino , Humanos , Incidencia , Masculino , Persona de Mediana Edad , Sistema de Registros , República de Corea/epidemiología , Medición de Riesgo , Factores de Riesgo , Accidente Cerebrovascular/complicaciones , Accidente Cerebrovascular/tratamiento farmacológico , Accidente Cerebrovascular/epidemiología
3.
Opt Express ; 26(2): 2013-2022, 2018 Jan 22.
Artículo en Inglés | MEDLINE | ID: mdl-29401922

RESUMEN

This paper presents fiber Bragg grating (FBG) inscription with a pulsed 248 nm UV KrF laser in polymer optical fibers (POFs) made of different polymers, namely polymethyl methacrylate (PMMA), cyclic-olefin polymer and co-polymer, and Polycarbonate. The inscribed gratings and the corresponding inscription parameters are compared with grating inscribed in POFs made of the aforementioned materials but with the hitherto most used laser for inscription, which is a continuous wave 325 nm UV HeCd laser. Results show a reduction of the inscription time of at least 16 times. The maximum time reduction is more than 130 times. In addition, a reflectivity and a bandwidth close to or higher than the ones with the 325 nm laser were obtained. The polymer optical fiber Bragg gratings (POFBGs) inscribed with the 248 nm laser setup present high stability with small variations in their central wavelength, bandwidth, and reflectivity after 40 days.

4.
Opt Express ; 25(8): 9028-9038, 2017 Apr 17.
Artículo en Inglés | MEDLINE | ID: mdl-28437977

RESUMEN

We experimentally demonstrate the first polymer optical fiber Bragg grating inscribed with only one krypton fluoride laser pulse. The device has been recorded in a single-mode poly(methyl methacrylate) optical fiber, with a core doped with benzyl dimethyl ketal for photosensitivity enhancement. One laser pulse with a duration of 15 ns, which provide energy density of 974 mJ/cm2, is adequate to introduce a refractive index change of 0.74×10-4 in the fiber core. After the exposure, the reflectivity of the grating increases for a few minutes following a second order exponential saturation. The produced Bragg grating structure rejects 17.9 dB transmitted power, thus providing 98.4% reflectivity, which is well suited for sensing applications. In addition, we report the importance of the fiber thermal treatment before or after the inscription, showing its effects on the lifetime and quality of the grating structures. Optimizing the irradiation conditions and the material chemical composition, a higher refractive index change in the fiber core is feasible. This demonstration significantly improves the potential for commercial exploitation of the technology.

5.
Appl Opt ; 56(12): 3622-3627, 2017 Apr 20.
Artículo en Inglés | MEDLINE | ID: mdl-28430230

RESUMEN

We propose a novel type of compact high-resolution multichannel micro-electro-mechanical systems (MEMS)-based interrogator, where we replace the linear detector with a digital micromirror device (DMD). The DMD is typically cheaper and has better pixel sampling than an InGaAs detector used in the 1550 nm range, which leads to cost reduction and better performance. Moreover, the DMD is a 2D array, which means that multichannel systems can be implemented without any additional optical components in the interrogator. This makes the proposed interrogator highly cost-effective, particularly for multichannel systems. The digital nature of the DMD also provides opportunities for advanced programmable Hadamard spectroscopy, which, without significant penalties, can greatly improve the wavelength fit resolution. Our results show that DMDs can be used in high-resolution spectroscopy and for Fiber Bragg grating (FBG) interrogation.

6.
Opt Express ; 24(23): 26667-26677, 2016 Nov 14.
Artículo en Inglés | MEDLINE | ID: mdl-27857397

RESUMEN

We demonstrate highly germania doped fibers for mid-infrared supercontinuum generation. Experiments ensure a highest output power of 1.44 W for a broadest spectrum from 700 nm to 3200 nm and 6.4 W for 800 nm to 2700 nm from these fibers, while being pumped by a broadband Erbium-Ytterbium doped fiber based master oscillator power amplifier. The effect of repetition frequency of pump source and length of germania-doped fiber has also been investigated. Further, germania doped fiber has been pumped by conventional supercontinuum source based on silica photonic crystal fiber supercontinuum source. At low power, a considerable broadening of 200-300 nm was observed. Further broadening of spectrum was limited due to limited power of pump source. Our investigations reveal the unexploited potential of germania doped fiber for mid-infrared supercontinuum generation. These measurements ensure the potential of germania based photonic crystal fiber or a step-index fiber supercontinuum source for high power ultra-broad band emission being by pumped a 1060 nm or a 1550 nm laser source. To the best of our knowledge, this is the record power, ultra-broadband, and all-fiberized supercontinuum light source based on silica and germania fiber ever demonstrated to the date.

7.
Appl Opt ; 55(23): 6156-61, 2016 Aug 10.
Artículo en Inglés | MEDLINE | ID: mdl-27534455

RESUMEN

We evaluate whether 850 nm fiber Bragg grating (FBG) sensor systems can use low-cost 1550 nm telecom fibers; in other words, how detrimental the influence of higher-order modes is to the polarization stability and linearity of the strain and temperature response. We do this by comparing polarization sensitivity of a few-mode 850 nm FBG sensor to a strictly single-mode 850 nm FBG sensor system using 850 nm single-mode fibers. We also compare the performance of the FBGs in strain and temperature tests. Our results show that the polarization stability and the linearity of the response degrade due to the presence of the higher-order modes. We demonstrate that, by using simple coiling of the 1550 nm fiber, one can regain the performance of the few-mode system and make it usable for high precision measurements.

8.
Opt Lett ; 40(7): 1476-9, 2015 Apr 01.
Artículo en Inglés | MEDLINE | ID: mdl-25831363

RESUMEN

In this Letter, we investigate the effects of viscoelasticity on both the strength and resonance wavelength of two fiber Bragg gratings (FBGs) inscribed in microstructured polymer optical fiber (mPOF) made of undoped PMMA. Both FBGs were inscribed under a strain of 1% in order to increase the material photosensitivity. After the inscription, the strain was released, and the FBGs spectra were monitored. We initially observed a decrease of the reflection down to zero after which it began to increase. After that, strain tests were carried out to confirm the results, and finally the gratings were monitored for a further 120 days, with a stable reflection response being observed beyond 50 days.

9.
Appl Opt ; 54(18): 5657-61, 2015 Jun 20.
Artículo en Inglés | MEDLINE | ID: mdl-26193010

RESUMEN

We propose a novel dynamic gate algorithm (DGA) for precise and accurate peak detection. The algorithm uses a threshold-determined detection window and center of gravity algorithm with bias compensation. We analyze the wavelength fit resolution of the DGA for different values of the signal-to-noise ratio and different peak shapes. Our simulations and experiments demonstrate that the DGA method is fast and robust with better stability and accuracy than conventional algorithms. This makes it very attractive for future implementation in sensing systems, especially based on multimode fiber Bragg gratings.

10.
Opt Express ; 22(19): 23324-32, 2014 Sep 22.
Artículo en Inglés | MEDLINE | ID: mdl-25321801

RESUMEN

We demonstrate a novel polarization maintaining hollow-core photonic bandgap fiber geometry that reduces the impact of surface modes on fiber transmission. The cladding structure is modified with a row of partially collapsed holes to strip away unwanted surface modes. A theoretical investigation of the surface mode stripping is presented and compared to the measured performance of four 7-cells core fibers that were drawn with different collapse ratio of the defects. The varying pressure along the defect row in the cladding during drawing introduces an ellipticity of the core. This, combined with the presence of antiresonant features on the core wall, makes the fibers birefringent, with excellent polarization maintaining properties.


Asunto(s)
Simulación por Computador , Diseño Asistido por Computadora , Tecnología de Fibra Óptica/instrumentación , Luz , Fotones , Dispersión de Radiación , Estrés Mecánico , Birrefringencia , Diseño de Equipo
11.
Opt Express ; 22(2): 1490-9, 2014 Jan 27.
Artículo en Inglés | MEDLINE | ID: mdl-24515156

RESUMEN

Gain-switching is an alternative pulsing technique of fiber lasers, which is power scalable and has a low complexity. From a linear stability analysis of rate equations the relaxation oscillation period is derived and from it, the pulse duration is defined. Good agreement between the measured pulse duration and the theoretical prediction is found over a wide range of parameters. In particular we investigate the influence of an often present length of passive fiber in the cavity and show that it introduces a finite minimum in the achievable pulse duration. This minimum pulse duration is shown to occur at longer active fibers length with increased passive length of fiber in the cavity. The peak power is observed to depend linearly on the absorbed pump power and be independent of the passive fiber length. Given these conclusions, the pulse energy, duration, and peak power can be estimated with good precision.

12.
Opt Lett ; 39(12): 3421-4, 2014 Jun 15.
Artículo en Inglés | MEDLINE | ID: mdl-24978501

RESUMEN

In this Letter, we provide evidence suggesting that the main photosensitive mechanism of an undoped poly(methyl methacrylate)-based microstructured optical fiber under UV radiation at 325 nm is a competitive process of both photodegradation and polymerization. We found experimentally that increasing strain during photo-inscription leads to an increased photosensitivity, which is evidence of photodegradation. Likewise, refractive index change in the fiber was measured to be positive, which provides evidence for further polymerization of the material. Finally, we relate the data obtained to the spatial recording resolution of the samples.

13.
Opt Express ; 21(10): 12302-8, 2013 May 20.
Artículo en Inglés | MEDLINE | ID: mdl-23736448

RESUMEN

Gain-switching of a CW fiber laser is a simple and cost-effective approach to generate pulses using an all-fiber system. We report on the construction of a narrow bandwidth (below 0.1 nm) gain-switched fiber laser and optimize the pulse energy and pulse duration under this constraint. The extracted pulse energy is 20 µJ in a duration of 135 ns at 7 kHz. The bandwidth increases for a higher pump pulse energy and repetition rate, and this sets the limit of the output pulse energy. A single power amplifier is added to raise the peak power to the kW-level and the pulse energy to 230 µJ while keeping the bandwidth below 0.1 nm. This allows frequency doubling in a periodically poled lithium tantalate crystal with a reasonable conversion efficiency.


Asunto(s)
Amplificadores Electrónicos , Tecnología de Fibra Óptica/instrumentación , Rayos Láser , Diseño de Equipo , Análisis de Falla de Equipo
14.
Opt Lett ; 38(19): 3769-72, 2013 Oct 01.
Artículo en Inglés | MEDLINE | ID: mdl-24081048

RESUMEN

In this Letter, we report the fabrication of a highly photosensitive, microstructured polymer optical fiber using benzyl dimethyl ketal as a dopant, as well as the inscription of a fiber Bragg grating in the fiber. A refractive index change in the core of at least 3.2×10(-4) has been achieved, providing a grating with a strong transmission rejection of -23 dB with an inscription time of only 13 min. The fabrication method has a big advantage compared to doping step index fiber since it enables doping of the fiber without using extra dopants to compensate for the index reduction in the core introduced by the photosensitive agent.

15.
Eur J Neurol ; 20(6): 928-34, 2013 Jun.
Artículo en Inglés | MEDLINE | ID: mdl-23398300

RESUMEN

BACKGROUND AND PURPOSE: The association between past stroke subtypes and recurrent stroke subtypes in non-cardiogenic stroke remains unknown. METHODS: Patients with ischaemic stroke who had a past history of large-artery disease (LAD) or small-artery disease (SAD) subtypes were assessed. LAD was subdivided into intracranial atherosclerosis (ICAS) and extracranial atherosclerosis (ECAS). LAD stroke mechanisms were categorized as artery-to-artery embolism, in situ thrombotic occlusion and local branch occlusion, while SAD was subdivided into lacunar infarction (LI) and branch atheromatous disease (BAD) on the basis of magnetic resonance imaging findings. The relationship between past and current strokes was analyzed. RESULTS: Among the 202 patients enrolled, the LAD group (n = 111) had 64 and 47 patients with ICAS and ECAS, and the SAD group (n = 91) had 63 and 28 patients with LI and BAD, respectively, at the time of past stroke. Patients with LAD developed LAD-associated strokes most often (n = 99, 89.2%), and patients with SAD developed SAD most often (n = 69, 75.8%; P < 0.001). Patients with ICAS were more likely to develop ICAS later (n = 46, 79.3%), whereas those with ECAS developed ECAS more often (n = 31, 75.6%; P < 0.001). Patients with ICAS presenting with artery-to-artery embolism more often developed artery-to-artery embolism later (n = 26, 72.2%), whereas those with local branch occlusion developed recurrent local branch occlusion most often (n = 10, 66.7%, P = 0.005). In the SAD group, patients with BAD developed LAD more frequently than the LI group (n = 11, 39.3% vs. n = 9, 14.3%, P = 0.022). CONCLUSIONS: The subtypes and mechanisms of recurrent stroke are significantly influenced by those of the past stroke.


Asunto(s)
Arteriosclerosis Intracraneal/diagnóstico , Arteriosclerosis Intracraneal/epidemiología , Accidente Cerebrovascular/diagnóstico , Accidente Cerebrovascular/epidemiología , Anciano , Anciano de 80 o más Años , Femenino , Humanos , Masculino , Persona de Mediana Edad , Valor Predictivo de las Pruebas , Estudios Prospectivos , Recurrencia , Estudios Retrospectivos , Factores de Riesgo
16.
Eur J Neurol ; 20(2): 353-60, 2013 Feb.
Artículo en Inglés | MEDLINE | ID: mdl-22958084

RESUMEN

BACKGROUND: In healthy elderly people, silent brain infarctions (SBIs) have been recognized as common lesions. In this study, we evaluated the association between SBI located outside the perforating artery territory (PAT) and paradoxical embolism detected by agitated saline transcranial Doppler (TCD) monitoring in healthy subjects. METHODS: This was a prospective observational study undertaken by a university health promotion center for healthy subjects and by a university stroke center for acute stroke patients. We defined SBI as evidence on fluid-attenuation inversion recovery (FLAIR) magnetic resonance imaging (MRI) of one or more infarcts, without history of corresponding stroke or transient ischaemic attack. We also evaluated in all subjects the neuroimaging indicator of microangiopathy leukoaraiosis (LA). This study is registered with ClinicalTrials.gov, number NCT01429948. RESULTS: Amongst 1103 consecutive healthy adults who underwent MRI, 347 (31%) had one or more SBIs located outside the PAT, suggesting embolism. Amongst them, 253 subjects underwent agitated saline TCD monitoring and 128 (51%) had right-to-left shunts (RLS). The prevalence of RLS was similar to cryptogenic embolic stroke (62.0%, P = 0.056), but higher than in patients with other stroke subtypes (36.2%, P = 0.021). Amongst subjects with SBI, absence of LA was the only factor associated with RLS (OR 1.78; 95% CI 1.01-3.14; P = 0.046). CONCLUSION: Our results suggest that paradoxical embolism may play an important role in the development of SBI outside the PAT in apparently healthy adults.


Asunto(s)
Infarto Encefálico/etiología , Embolia Paradójica/patología , Encéfalo/irrigación sanguínea , Encéfalo/patología , Infarto Encefálico/diagnóstico por imagen , Infarto Encefálico/epidemiología , Infarto Encefálico/patología , Embolia Paradójica/diagnóstico por imagen , Femenino , Foramen Oval Permeable/diagnóstico por imagen , Foramen Oval Permeable/patología , Humanos , Leucoaraiosis/complicaciones , Leucoaraiosis/diagnóstico por imagen , Leucoaraiosis/patología , Imagen por Resonancia Magnética , Masculino , Persona de Mediana Edad , Arteria Cerebral Media/patología , Neuroimagen/métodos , Prevalencia , Estudios Prospectivos , República de Corea/epidemiología , Factores de Riesgo , Accidente Cerebrovascular/diagnóstico , Accidente Cerebrovascular/epidemiología , Accidente Cerebrovascular/patología , Ultrasonografía Doppler Transcraneal
17.
Opt Express ; 20(3): 2851-7, 2012 Jan 30.
Artículo en Inglés | MEDLINE | ID: mdl-22330522

RESUMEN

We experimentally investigate the noise properties of picosecond supercontinuum spectra generated at different power levels in uniform and tapered photonic crystal fibers. We show that the noise at the spectral edges of the generated supercontinuum is at a constant level independent on the pump power in both tapered and uniform fibers. At high input power the spectral bandwidth is limited by the infrared loss edge, this however has no effect on the noise properties.


Asunto(s)
Modelos Teóricos , Fibras Ópticas , Simulación por Computador , Diseño Asistido por Computadora , Diseño de Equipo , Análisis de Falla de Equipo , Luz , Dispersión de Radiación , Relación Señal-Ruido
18.
Opt Express ; 20(10): 10635-45, 2012 May 07.
Artículo en Inglés | MEDLINE | ID: mdl-22565689

RESUMEN

We use an asymmetric 2 m draw-tower photonic crystal fiber taper to demonstrate that the taper profile needs careful optimisation if you want to develop a supercontinuum light source with as much power as possible in the blue edge of the spectrum. In particular we show, that for a given taper length, the downtapering should be as long as possible. We argue how this may be explained by the concept of group-acceleration mismatch (GAM) and we confirm the results using conventional symmetrical short tapers made on a taper station, which have varying downtapering lengths.


Asunto(s)
Biofisica/métodos , Algoritmos , Cristalización , Diseño de Equipo , Tecnología de Fibra Óptica , Luz , Modelos Teóricos , Fibras Ópticas , Fotones , Física/métodos , Reproducibilidad de los Resultados , Espectrometría Raman/métodos , Rayos Ultravioleta
19.
Eur J Neurol ; 19(2): 317-23, 2012 Feb.
Artículo en Inglés | MEDLINE | ID: mdl-21914053

RESUMEN

BACKGROUND AND PURPOSE: Cardiac evaluation is routinely conducted in patients with ischaemic stroke because embolisms originating from the heart are an important cause of stroke. We compared the prevalence of cardioaortic sources of cerebral embolism (CSCE) in patients with ischaemic stroke detected by transthoracic echocardiography (TTE) and/or multidetector cardiac computed tomography (MDCT). Additionaly, we investigated the frequency and severity of asymptomatic coronary artery disease (CAD) in patients who underwent MDCT. METHODS: We prospectively recruited patients with non-atrial fibrillation-related stroke who had no history of cardiac disease. Patients underwent cardiac evaluation using TTE alone (N=243, during the early phase of this study--TTE period), TTE and MDCT (N=62, midphase--transitional period) and MDCT alone (N=138, late phase--MDCT period). CSCE were defined according to the original and revised TOAST classifications. CAD was defined as 50% or more stenosis of the coronary artery. RESULTS: Patients' characteristics did not differ amongst groups; however, CSCE were more frequently detected in the MDCT period than in the TTE period (18.1% vs. 6.6%, P<0.001). In the transitional period, there were 16 patients (25.8%) who were found to be CSCE by MDCT but not TTE, whilst three patients (4.8%) were found to be CSCE by TTE but not MDCT (P=0.004). Amongst the patients who underwent MDCT, 72 (36.0%) had asymptomatic CAD, invasive coronary angiography was needed in 21 (10.5%) and 10 (5.0%) patients finally underwent coronary intervention. CONCLUSION: Multidetector cardiac computed tomography proved to be complementary to TTE for the identification of CSCE and can detect asymptomatic CAD, one of the major causes of vascular death in patients with stroke, in patients with non-atrial fibrillation-related stroke.


Asunto(s)
Isquemia Encefálica/complicaciones , Enfermedades Cardiovasculares/diagnóstico , Ecocardiografía/métodos , Tomografía Computarizada Multidetector/métodos , Accidente Cerebrovascular/complicaciones , Anciano , Fibrilación Atrial/complicaciones , Fibrilación Atrial/diagnóstico , Enfermedades Cardiovasculares/complicaciones , Enfermedad Coronaria/complicaciones , Enfermedad Coronaria/diagnóstico , Femenino , Humanos , Masculino , Persona de Mediana Edad
20.
Eur J Neurol ; 19(11): 1433-9, 2012 Nov.
Artículo en Inglés | MEDLINE | ID: mdl-22524973

RESUMEN

BACKGROUND: Few studies have focused on the mechanisms underlying medullary infarctions. Our aim in this study was to investigate stroke mechanisms in patients with medullary infarctions and to determine the clinical, radiological and laboratory characteristics of these patients with different underlying stroke etiologies. METHODS: Consecutive patients with medullary infarction were analysed. Stroke mechanisms were classified as large artery disease (LAD), cardiogenic embolism (CE), small vessel disease (SVD), arterial dissection or undetermined etiology. Clinical, radiological and laboratory factors were analysed according to the location of the lesion and stroke mechanisms. RESULTS: A total of 77 patients were enrolled in this study. Amongst them, 53 (68.8%) patients had lateral medullary infarction (LMI), 22 (28.6%) had medial medullary infarction (MMI), and the remaining 2 (2.6%) had hemimedullary infarction. In both LMI and MMI patients, LAD was the most frequently encountered stroke mechanism. Arterial dissection was the second most common cause followed by SVD and CE in patients with LMI, whereas SVD was more frequently observed (P < 0.001) and dissection and CE were less prevalent (P < 0.001 and P = 0.024, respectively) in MMI than in LMI. Regarding differences amongst stroke etiologies, patients with dissection were younger and had a significantly lower incidence of metabolic syndrome (P = 0.002 and P = 0.009, respectively) than patients with LAD and SVD. Patients in the LAD (19/34, 60%) and dissection groups (12/14, 75%) had abnormal perfusion-weighted MRI (PWI) findings, whereas all patients with SVD (9/9) had normal PWI findings (P < 0.001). CONCLUSIONS: Stroke mechanisms in medullary infarction differ between LMI and MMI. Clinical and radiological characteristics, especially PWI features, are helpful in discriminating the etiologies of stroke in these patients.


Asunto(s)
Infartos del Tronco Encefálico/complicaciones , Infartos del Tronco Encefálico/patología , Accidente Cerebrovascular/etiología , Accidente Cerebrovascular/patología , Anciano , Imagen de Difusión por Resonancia Magnética , Femenino , Humanos , Angiografía por Resonancia Magnética , Masculino , Bulbo Raquídeo , Persona de Mediana Edad
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