Scanning laser tomography z profile signal width as an. Supported laser scan file formats navisworks products. Scanning laser polarimetry is basically a confocal scanning laser ophthalmoscope with an integrated ellipsometer to measure retardation. Ischemic changes in a case of unilateral pseudoexfoliation. Elevated intraocular pressure has long been thought to be the primary cause, but the. Scanning laser polarimetry slp determines the thickness of nerve tissue by examining the birefringence of polarized light as it is reflected from the eye. It utilizes the birefringent properties of the rnfl, which produces a change in polarization called retardation of the light reflected by the rnfl. Technology today the nerve fiber layer and scanning. In retinal scanning laser polarimetry slp, the cornea, lens, and retina are all treated as linear retarders optical elements that introduce retardation to an illuminating beam.
Retardance images were written to a file by a software routine provided with the. To determine whether retardation change in polarization measurements of healthy subjects and glaucoma patients obtained by using a. Scanning laser polarimetry, retinal birefringence, light retardation, retinal nerve fiber layer, glaucoma, anterior segment birefringence. It presents new approaches for analysis of the biomedical scan data of retinal nerve fiber layer rnfl thickness obtained through scanning laser polarimetry that can lead to better tools for early diagnoses of glaucoma. Scanning laser polarimetry versus matrix perimetry, optical coherence tomography, and retinal nerve fiber layer photography using heidelberg retina angiograph 1. Kupersmith, mj curriculum vitae roosevelt hospital th. A series of four images, corresponding to independent incoming polarization states, were recorded. Scanning laser polarimetry measures change in the linear polarization of light retardation.
See the following table for the laser scan file formats you can open in autodesk navisworks. Advanced imaging for glaucoma study manual of procedures. The main birefringent intraocular tissues are the cornea, lens and the retina. The general principles of scanning laser polarimetry have been describedin detail elsewhere. Although these techniques differ, the objective is the. Supported laser scan file formats navisworks products 2017. The impact of retardance pattern variability on nerve fiber layer measurements over time using. Scanning laser polarimetry to measure the nerve fiber layer of normal and glaucomatous eyes robert n. Scanning laser polarimetry slp is an imaging technology designed to provide objective assessment of the thickness of the retinal nerve fiber layer rnfl, with. Reproducibility of the data determined by scanning laser. The thickness maps of the rnfl obtained from a scanning laser polarimeter gdx. Detecting glaucoma in biomedical data using image processing. What links here related changes upload file special pages permanent link page. Hrt appeared promising 7, but was limited by the difficulty in defining an appropriate reference plane in the peripapillary retina for quantifying elevation of the nerve head above that plane, especially in higher grades of.
Comparison of blue and green confocal scanning laser. Short duration transient visual evoked potentials in. Scanning laser polarimetry slp, also known as gdx, is an imaging technology based on the retardation of light that has doublepassed the birefringent fibers of the retinal nerve fiber layer rnfl. Analytical methods for scanning laser polarimetry osa. Find any required new, refurbished or used scanning laser polarimetry equipment or device. Scanning laser tomography hrt, marcelo nicolela, alfonso anton, somkiat asawaphureekorn, claude burgoyne and goji tomita53 scanning laser polarimetry slp, hans g. What is the clinical effectiveness of scanning laser glaucoma tests confocal scanning laser ophthalmoscopy, scanning laser polarimetry and optical coherence tomography compared to automated perimetry for diagnosing glaucoma. Both technologies helped solidify the concept that structural change can precede visual field loss. In the past, scanning laser polarimetry has shown to discriminate well between normal and glaucomatous eyes. We present a polarimetric technique to improve fundus images that notably simplifies and extends a previous procedure opt. Scanning laser polarimetry an overview sciencedirect. To develop a quantitative understanding of scanning laser polarimetry slp for. A generator of varying polarization states was incorporated into the illumination path of a confocal scanning laser ophthalmoscope.
Used zeiss gdxpro8000 ophthalmic laser for sale dotmed. Scanning laser polarimetry is an imaging technology that is utilized to measure peripapillary rnfl thickness. Comparison of scanning laser polarimetry, optical coherence. Scanning laser polarimetry may have good sensitivity and specificity for separating normal from abnormal eyes, but it is not as good for classifying unknown subjects when glaucoma suspects are. Pdf to text batch convert multiple files software please purchase personal license. Scanning laser polarimetry to measure the nerve fiber. Determination of foveal location using scanning laser polarimetry. Imagesof the ocular fundus are formed by scanning the beam of a near infrared laser 780 nm in a raster pattern.
Osa analytical methods for scanning laser polarimetry. Birefringence measurement of the retinal nerve fiber layer by. Scanning laser polarimetry definition of scanning laser. The first commercial scanning laser polarimeter was the the nerve fiber layer and scanning laser polarimetry the history and utility of this technology. Scanning lenses ftheta product information optical. Scanning laser polarimetry gdx and high definition optical coherence tomography to detect changes in the peripapillary nerve fiber layer with optic nerve damage and morphometrics alterations in the optic nerve head 2010 empire clinical research investigator program ecrip awards for 20112012. Lemij, eytan blumenthal, robert fechtner, david greenfield and michael kook 61 optical cohererence tomography oct, jeffrey liebmann. Pdf vs tiff for general documents laserfiche answers. Glaucoma is a disease characterized by degeneration of the optic disc. Unlike cslo, scanning laser polarimetry slp can directly measure the thickness of the rnfl.
For each patient, gdx ecc scans were obtained on the same day and on the same machine as were the gdx vcc scans. Of cataract and refractive surgery, san diego bahadur gg, sylvester da. Jul 05, 2014 scanning laser polarimetry versus matrix perimetry, optical coherence tomography, and retinal nerve fiber layer photography using heidelberg retina angiograph 1. Scanning laser polarimetry in eyes with exfoliation syndrome article pdf available in european journal of ophthalmology 235 march 20 with 34 reads how we measure reads. Comparison of scanning laser polarimetry, optical coherence tomography 1 and stratus optical coherence tomography for the detection of axonal loss in band. The subject had normal color vision with ishihara plates and no relative afferent pupillary defect. Management of glaucoma scanning laser ophthalmoscopy slo scanning laser polarimetry slp grewal ds, sehi m, cook rj, greenfield ds and advanced imaging in glaucoma study group. Zeiss gdx pro 8000 scanning laser polarimetry for sale. Scanning laser polarimetry an overview sciencedirect topics. They advocate that neuro degeneration is an early component of dm, and may occur alongside diabetic retinopathy, but the preferential thinning of two quadrants only still needs to be explained. The authors are well aware, that overview papers on laser scanning have been.
Scanning laser polarimetry slp, a technology for glaucoma diagnosis, uses imaging polarimetry to detect the birefringence of the retinal nerve fiber layer. The heidelberg retina tomograph is a scanning laser ophthalmoscope that can create threedimensional images of the retina and optic nerve head. Pdf to determine the correlations and strength of association between different imaging systems in analyzing the retinal nerve fiber layer rnfl of. Medical coverage policy computerized ophthalmic imaging. Pdf scanning laser polarimetry in eyes with exfoliation. Imagesof the ocular fundus are formed by scanning the beam of a near infrared laser780 nm in a raster pattern. Scanning laser polarimetry to measure the nerve fiber layer. A swept source polarizationsensitive optical coherence tomography sspsoct instrument has been designed, constructed, and verified to provide high sensitivity depthresolved birefringence and phase retardation measurements of the retinal nerve fiber layer. The goal of this thesis was to investigate the clinical performance of the gdx a revised version of the first scanning laser polarimeter, the nerve fiber analyzer. Scanning laser polarimetry in glaucoma t anuj dada, reetika sharma, dewang angmo, gautam sinha, shibal bhartiy a, sanjay k mishra, anita panda, ramanjit sihota. Scanning laser polarimetry slp the rnfl is a birefringent or biorefractive, meaning that it causes a change in the state of polarization of a laser beam as it passes. The henle fiber layer exhibits form birefringence, which predictably changes polarized light in scanning laser polarimetry imaging.
Scanning laser polarimetry slp has undergone multiple hardware and software changes, particularly in neutralizing anterior segment birefringence, to improve its ability to recognize retinal nerve fiber layer retardation. Scanning laser polarimetry is a technique for assessing the thickness of the retinal nerve fiber layer in vivo. Description carl zeiss scanning laser polarimetry gdxpro 8000. Analytical model of scanning laser polarimetry for retinal nerve. A number of new studies were identified assessing the sensitivity and specificity of the heidelberg retina tomograph 3, optical coherence tomography oct, and scanning laser polarimetry. Scanning computerized ophthalmic diagnostic imaging scodi is a valuable tool for the evaluation and treatment of patients with retinal disease, especially macular abnormalities. The polarization state of the light emerging from the eye is then evaluated and correlated with rnfl thickness. Optical coherence tomography and scanning laser polarimetry slp are the techniques that utilize the evaluation of rnfl for the evaluation of glaucoma. Scanning laser polarimetry is the use of polarised light to measure the thickness of the retinal nerve fiber layer as part of a glaucoma workup. Images with atypical patterns of retardation were not included, as they. Gdxpro scaning laser polarimetry glaucoma carl zeiss meditec international. Diagnostic accuracy of scanning laser polarimetry with. Gdx is a common example of a scanning laser polarimeter.
Scanning laser tomography slt is a noninvasive technique which permits the objective, topographic measurement of the fundus. Gdxpro, the worlds only scanning laser polarimeter, provides a unique measurement derived from both rnfl thickness and rnfl structural organization. The measurement of ocular blood flow, pulsatile ocular blood flow, or blood flow velocity is considered not medically necessary in the diagnosis and followup of patients with glaucoma as the evidence is insufficient to. The size, orientation, and more specifically the microtubular structure of the nerve fibers cause birefringence of incident light. This thesis addresses the problem of the early detection of an eye blinding disease, glaucoma. Used zeiss, gdx pro 8000, scanning laser polarimetry for sale. Comparison of the gdx vcc scanning laser polarimeter, hrt ii.
It presents new approaches for analysis of the biomedical scan data of retinal nerve fiber layer rnfl thickness obtained through scanning laser polarimetry that. Comparison of the gdx vcc scanning laser polarimeter, hrt. Recently, rnfl imaging techniques such as scanning laser polarimetry, confocal scanning laser ophthalmoscopy cslo, and optical coherence tomography oct have been increasingly used in clinical practice and are rapidly evolving. But they want to simplify the process by having an option available to scan into laserfiche directly as pdf. They are designed to be a working document to be adapted for local use, and we hope that the guidelines are easy to read and translate. Technology today the nerve fiber layer and scanning laser. Automatic mapping to an automatically generated ip address. Advanced imaging for glaucoma study manual of procedures version 8.
If the deflection of the laser beam occurs in the beam path in front of the lens, the scanning path lies in a plane perpendicular to the optical axis of the lens. A linear retarder has a slow axis and a fast axis, and the two axes are orthogonal to each other. It uses both a polarimeter an optical device to measure linear polarization change and a scanning laser ophthalmoscope, to measure the thickness of the nerve fiber layer of the retina. A simple model of slp suggests an algorithm for calculating birefringence that, unlike previous methods, uses all of the data available in the images to achieve better signaltonoise ratio and lower sensitivity to depolarization. Two observers examined 56 normal volunteers twice by means of scanning laser polarimetry nerve fiber analyzer type 1, software version 1. Utilizing oct nerve fiber layer and ganglion cell layer. Scanning laser polarimetry gdx vcc, carl zeiss, usa figure 3 and optical coherence tomography octslo, ophthalmic technologies inc. A basic understanding of how birefringence and retardation is vital to understand how this tech pictures the optic nerve. In normal subjects, the photoreceptor axons that make up the henle fiber layer are cylindrical and the radial orientation of these fibers is centered on the fovea. These results are demonstrated in table 3 and are in the same format as table2. It determines the rnfl thickness, point by point in the peripapillary region, by measuring the total retardation in the light reflected from the retina.
Scanning laser polarimetry slp, a technology for glaucoma diagnosis, uses. Scanning laser polarimetry with variable corneal compensation gdxvcc details of this technique have been described earlier. Scanning laser polarimetry slp the rnfl is a birefringent, causing a change in the state of polarization of a laser beam as it passes. This is the first edition of the ico guidelines for glaucoma eye care february 2016. Birefringence measurement of the retinal nerve fiber layer. Scanning laser polarimetry is the use of polarised light to measure the thickness of the retinal. However a dutch study found that while there is a correlation between standard automated perimetry and gdx vcc measurements in patients with glaucoma, suggesting that gdx vcc measurements relate well with functional loss in. Gdxpro scaning laser polarimetry glaucoma carl zeiss. Kupersmith, mj curriculum vitae roosevelt hospital th ave. Management of glaucoma fdtswap horn fk, lammer r, mardin cy, junemann ag, michelson g, lausen b, adler w. Capability of obtaining complete polarimetric information is therefore an attractive. To open your file in autodesk navisworks, convert it into ascii laser file format first. Zeiss gdx pro 8000 is the only commercially available, currentgeneration scanning laser polarimeter.
Osa improved scanning laser fundus imaging using polarimetry. Though the technology has been available for several years, recent advances have resulted in improved imaging capabilities that may enhance clinicians ability to identify and follow the progression of glaucoma. Pdf optical coherence tomography, scanning laser polarimetry. Can we scan into laserfiche directly as pdf laserfiche. Local coverage determination for scanning computerized.
Jun 15, 2003 scanning laser polarimetry is a technique for assessing the thickness of the retinal nerve fiber layer in vivo. Dicom gateway for compatibility with zeiss networking solutions. After the images are collected, the device analyzes them to calculate values such as the area of the optic nerve head, the area and volume of the neuroretinal rim, the ratio of the area of. Yag laser photolysis system for cataract removal though 1. Scanning laser ophthalmoscopy and scanning laser polarimetry are techniques used to diagnose and evaluate glaucoma. Scanning laser topography and scanning laser polarimetry.
A 780nm diode laser is used to illuminate the optic nerve. Detection of glaucoma using scanning laser polarimetry with. If the image height y is to be proportional to the scanning angle theta, then y f x. Combined evaluation of frequency doubling technology perimetry and scanning laser ophthalmoscopy for glaucoma detection using automated classification. Methods scanning laser polarimetry was performed on 10 normal subjects.