Laser Scanning 3D Display with Dynamic Exit Pupil

A novel auto-stereoscopic 3D display system that forms dynamic exit pupils with the aid of a head-tracker is described Different views are displayed using time-multiplexing. Visible lasers, beam combiner, shaping and scanning optics and exit pupil control optics are discussed. It is estimated that 100 fL display brightness is achievable with about 3W per color of R, G and, B lasers

Determination of Cytomegalovirus Prevalence and Glycoprotein B Genotypes Among Ulcerative Colitis Patients in Ahvaz, Iran

Background: The human cytomegalovirus (HCMV) is a common pathogen which usually remains asymptomatic in the healthy adults; however, it can cause a symptomatic disease in the immunocompromised patients. The risk of infection with HCMV increases in ulcerative colitis (UC) patients as a result of receiving immunosuppressive agents. Objectives: This study aimed to determine the prevalence and the glycoprotein B genotypes of HCMV among the patients with HCMV disease superimposed on an UC flare that required hospitalization in Imam Khomeini Hospital in Ahvaz, Iran, during 2010- 2012. Patients and Methods: In this case-control study, formalin-fixed paraffin-embedded intestinal tissue samples were taken from 98 patients with UC disease including 53 males and 45 females (mean age ± standard deviation, 38.95 ± 17.93) and 67 control patients with noninflammatory disease who were referred to Imam Khomeini Hospital during 2010-2012. Detection of HCMV genome in intestinal samples was carried out by seminested polymerase chain reaction. Glycoprotein B genotypes were determined by sequencing. Results: Among 98 patients with UC, only 12 (12.2%) patients were positive for HCMV genome, while the HCMV genome was not detected in any of the controls. (P = 0.002). The distribution of HCMV gB genotypes in 12 CMV-positive UC patients was as follow: gB1, 11 (91.7%) and gB3, 1 (8.3%). The most prevalent genotype in CMV-positive UC patients was gB1. Conclusions: In this study, high prevalence of 91.7% HCMV gB1 genotype was predominant among HCMV-positive UC patients, which suggests that there might be an association between HCMV gB genotype 1 and UC disease

Light engine and optics for HELIUM3D auto-stereoscopic laser scanning display

This paper presents a laser based auto-stereoscopic 3D display technique and a prototype utilizing a dual projector light engine. The solution described is able to form dynamic exit pupils under the control of a multi-user head-tracker. A prototype completed recently is able to provide a glasses-free solution for a single user at a fixed position. At the end of the prototyping phase it is expected to enable a multiple user interface with an integration of the pupil tracker and the spatial light modulator

Beam forming for a laser based auto-stereoscopic multi-viewer display

An auto-stereoscopic back projection display using a RGB multi-emitter laser illumination source and micro-optics to provide a wider view is described. The laser optical properties and the speckle due to the optical system configuration and its diffusers are characterised

Genetic Basis of Myocarditis: Myth or Reality?

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Mycobacterial culture of fine needle aspirate - A useful tool in diagnosing tuberculous lymphadenitis

A prospective study was undertaken on suspected lymph node TB (LNTB) patients, to evaluate the diagnostic utility of mycobacterial culture of fine needle aspirate (FNA), in comparison with the cytological examination and acid fast staining. Eighty percent of 157 aspirates studied were positive by cytological examination; 18% by ZN smear and 45% were positive by culture. Twelve aspirates which were negative by cytological features yielded positive mycobacterial cultures; four out of these were from HIV positive patients. Our observations suggest that supplementing FNA cytology with mycobacterial culture would increase the sensitivity of diagnosing LNTB; in addition to giving a highly specific diagnosis

Laser scanning based autostereoscopic 3D display with pupil tracking

An autostereoscopic 3D display based on direct-view RGB laser projection via a transparent display screen is presented. Dynamic exit pupils are formed at the target eye locations with the help of a pupil tracker

A neuro-computational model of pallidal vs. subthalamic deep brain stimulation effect on synchronization at tremor frequency in Parkinson's disease

Parkinson's disease is a neurodegenerative disorder, associated with different motor symptoms including tremor, akinesia, bradykinesia, rigidity as well as gait and speech impairments. Previously, we have presented a neurobiologically detailed neuro-computational model simulating the basal ganglia functioning as well as the effects of subthalamic deep brain stimulation on action section (Mandali A, Chakravarthy VS, Rajan R, Sarma S, Kishore A, Front Physiol 7:585, 2016; Mandali A, Rengaswamy M, Chakravarthy S, Moustafa AA, Front Neurosci 9:191, 2015). In the current study, we extend our prior model by including thalamic and cortical neurons and compare the effect of subthalamic and pallidal stimulation on tremor in terms of oscillations within STN and GPi and subsequently their effect on the cortex. In agreement with existing experimental studies, our model shows that subthalamic stimulation is more effective at reducing the tremor power than the pallidal stimulation. Our model provides a mechanistic explanation for such comparative results