PubMed Journals Articles About "Pocket Sized Retina Camera Dilating Required" RSS

14:47 EDT 25th September 2018 | BioPortfolio

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Showing "Pocket sized retina camera dilating required" PubMed Articles 1–25 of 7,200+

Morphology and ultrastructure of the infrabuccal pocket and its lining epithelium in workers of Ectomomyrmex javanus (Hymenoptera: Formicidae).

This paper describes the morphology and ultrastructure of the infrabuccal pocket in workers of the carnivorous ant Ectomomyrmex javanus, using SEM and TEM. The infrabuccal pocket is a flexible bag with a diameter of 330 ± 30 μm. In its anterior part, the pocket wall reaches a thickness of 24.45 ± 3.45 μm, which is thicker than the wall lining the rest of the infrabuccal pocket, where it measures 6.87 ± 1.12 μm. The epidermal cells of the wall form a thickened epithelium with a thickn...

Camera Shutter-Independent Registration and Rectification.

Inevitable camera motion during exposure does not augur well for free-hand photography. Distortions introduced in images can be of different types and mainly depend on the structure of the scene, the nature of camera motion, and the shutter mechanism of the camera. In this paper, we address the problem of registering images taken from global shutter and rolling shutter (RS) cameras and reveal the constraints on camera motion that admit registration, change detection, and rectification. Our analysis encompas...

Sensory Biology: How to Structure a Tailor-Made Retina.

A new study of the zebrafish retina using sophisticated imaging has revealed how anisotropic properties of the retina are closely matched to the statistics of the natural visual world that the fish experiences.

Magic Circle.

Full-horizon cylindrical projections of the optic array are in common use. One wonders whether the public actually profits from such pictorial information, since the space behind one's back does not exist in visual awareness. In an experiment, a test image included six persons located at the corners of an irregular hexagon centred at the camera. Two persons faced the camera, two turned their back to the camera and two others faced a direction at right angles to the camera. The distances to the camera were u...

Reconsidering the Postoperative Day 0 Visit for Retina Surgery.

This study compares outcomes of patients who were examined on postoperative (PO) day 0 and PO day 1 following retina surgery.

Genetic Testing for Retina Specialists.


The internal limiting membrane (ILM), the innermost basement membrane of the retina, is peeled occasionally during vitreous surgery. This study aimed to investigate the effect of ILM loss on the retina.

Astatine-211 imaging by a Compton camera for targeted radiotherapy.

Astatine-211 is a promising radionuclide for targeted radiotherapy. It is required to image the distribution of targeted radiotherapeutic agents in a patient's body for optimization of treatment strategies. We proposed to image At with high-energy photons to overcome some problems in conventional planar or single-photon emission computed tomography imaging. We performed an imaging experiment of a point-like At source using a Compton camera, and demonstrated the capability of imaging At with the high-energy ...

General Model of Photon-Pair Detection with an Image Sensor.

We develop an analytic model that relates intensity correlation measurements performed by an image sensor to the properties of photon pairs illuminating it. Experiments using an effective single-photon counting camera, a linear electron-multiplying charge-coupled device camera, and a standard CCD camera confirm the model. The results open the field of quantum optical sensing using conventional detectors.

Comparative proteomic analysis of normal and gliotic PVR retina and contribution of Müller glia to this profile.

Müller glia are responsible for the neural retina regeneration observed in fish and amphibians throughout life. Despite the presence of these cells in the adult human retina, there is no evidence of regeneration occurring in humans following disease or injury. It may be possible that factors present in the degenerated retina could prevent human Müller glia from proliferating and neurally differentiating within the diseased retina. On this basis, investigations into the proteomic profile of these cells and...

let-7 MicroRNA-Mediated Regulation of Shh Signaling and the Gene Regulatory Network Is Essential for Retina Regeneration.

Upon injury, Müller glia cells of the zebrafish retina reprogram themselves to progenitor cells with stem cell characteristics. This necessity for retina regeneration is often compromised in mammals. We explored the significance of developmentally inevitable Sonic hedgehog signaling and found its necessity in MG reprogramming during retina regeneration. We report on stringent translational regulation of sonic hedgehog, smoothened, and patched1 by let-7 microRNA, which is regulated by Lin28a, in Müller gl...

A Random Forest classifier-based approach in the detection of abnormalities in the retina.

Classification of abnormalities from medical images using computer-based approaches is of growing interest in medical imaging. Timely detection of abnormalities due to diabetic retinopathy and age-related macular degeneration is required in order to prevent the prognosis of the disease. Computer-aided systems using machine learning are becoming interesting to ophthalmologists and researchers. We present here one such technique, the Random Forest classifier, to aid medical practitioners in accurate diagnosis...

Impact of euthanasia, dissection and postmortem delay on metabolic profile in mouse retina and RPE/choroid.

Metabolomics studies in the retina and retinal pigment epithelium (RPE) in animal models or postmortem donors are essential to understanding the retinal metabolism and to revealing the underlying mechanisms of retinal degenerative diseases. We have studied how different methods of euthanasia (CO or cervical dislocation) different isolation procedures and postmortem delay affect metabolites in mouse retina and RPE/choroid using LC MS/MS and GC MS. Compared with cervical dislocation, CO exposure for 5 min d...


To determine whether preoperative adjustments are required for intraocular lens calculations in combined phacovitrectomy surgery.

Three-dimensional visualization of rat retina by X-ray differential phase contrast tomographic microscopy.

The retina is one of the most tiny and sophisticated tissues of the body. Three dimensional (3D) visualization of the whole retina is valuable both in clinical and research arenas. The tissue has been predominantly assessed by time-consuming histopathology and optical coherence tomography (OCT) in research and clinical arenas. However, none of the two methods can provide 3D imaging of the retina. The purpose of this study is to give a volumetric visualization of rat retina at submicron resolution, using an ...

The Development of Mid-Wavelength Photoresponsivity in the Mouse Retina.

Photoreceptors in the mouse retina express much of the molecular machinery necessary for phototransduction and glutamatergic transmission prior to eye opening at postnatal day 13 (P13). Light responses have been observed collectively from rod and cone photoreceptors via electroretinogram recordings as early as P13 in mouse, and the responses are known to become more robust with maturation, reaching a mature state by P30. Photocurrents from single rod outer segments have been recorded at P12, but no earlier,...

Large field of view imaging system for remote target capture and trajectory measurement based on cone rotation.

In the remote target trajectory measurement system, because of the size limitation of the image sensor, the angle of view of the current telephoto camera is very small, which cannot meet the requirements of target acquisition. After comparing the current large-field imaging methods, a scheme of a large field of view (FoV) and high frame rate scanning by controlling the camera to perform conical rotation is proposed, and a 3 × 3 external FoV stitching system that includes the scheme is designed. An experime...


To investigate the difference in choroidal hyperpermeability (CH) assessed using digital fundus camera (DFC) and scanning laser ophthalmoscope (SLO) and its effect on photodynamic therapy (PDT) outcomes in chronic central serous chorioretinopathy.

Levels of retinal IAPP are altered in Alzheimer's disease patients and correlate with vascular changes and hippocampal IAPP levels.

Islet amyloid polypeptide (IAPP) forms toxic aggregates in the brain of patients with Alzheimer's disease (AD). Whether IAPP also affects the retina in these patients is still unknown. Levels of IAPP in soluble and insoluble homogenate fractions of retina and hippocampus from AD patients and nondemented controls were analyzed using ELISA. Number of pericytes and vessel length were determined by analysis of immunostained retina and hippocampus. Insoluble retinal fractions of AD patients contained lower level...

Optical measurement of glutamate in slice preparations of the mouse retina.

Signaling by glutamatergic synapses plays an important role in visual processing in the retina. In this study, we used an enzyme-linked fluorescence assay system to monitor the dynamics of extracellular glutamate in a slice preparation from the mouse retina. High K stimulation induced an elevation of fluorescence in the inner plexiform layer (IPL) of the retina when glutamate transporters were inhibited by dl-threo-β-benzyloxyaspartic acid (TBOA). The high K-induced fluorescence signals in the IPL were inh...

Endoscopic System Based on Intraoral Camera and Image Processing.

In dentistry, dentists perform many treatments with a few visually magnified information. About deep area of root canals, it commonly relies on exploration carried out with the fingers of the dentist, because the root canal entrance is very small to be observed. In clinical practice, the intraoral camera and endoscopic systems are separate devices, and there are no sensors to capture both pictures of the whole tooth and those inside the root canal. Objective of this research is to combine the intraoral came...

Methods based on 1D homography for camera calibration with 1D objects.

This paper focuses on camera calibration with one-dimensional (1D) objects, and novel methods are proposed in this paper. Different from the known 1D object-based camera calibration algorithms, which define the camera coordinate system as the world coordinate system, we assume that the 1D calibration object is located along the X axis of the world coordinate system. Based on this new model, a 3×2 1D homography is defined to relate the points in the 1D objects to the perspective image points thereof. Then, ...

Four-Minute Bone SPECT Using Large-Field Cadmium-Zinc-Telluride Camera.

The aim of this study was to determine the minimum acquisition time without decreasing lesion detectability of bone SPECT using a whole-body cadmium-zinc-telluride camera.

Material Classification from Time-of-Flight Distortions.

This paper presents a material classification method using an off-the-shelf Time-of-Flight (ToF) camera. The proposed method is built upon a key observation that the depth measurement by a ToF camera is distorted for objects with certain materials, especially with translucent materials. We show that this distortion is due to the variation of time domain impulse responses across materials and also due to the measurement mechanism of the ToF cameras. Specifically, we reveal that the amount of distortion varie...

Effect of Resveratrol on Sirtuins, OPA1, and Fis1 Expression in Adult Zebrafish Retina.

We determined whether sirtuins (SIRT1-SIRT7) are expressed in the zebrafish retina, evaluated the modulatory effect of resveratrol in the normal retina, and examined N-Methyl-D-aspartic acid (NMDA)-induced zebrafish retinal damage associated with mitochondrial sirtuins and mitochondrial fusion and fission mediators, OPA1 and Fis1.

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