After core vitrectomy, internal limiting membrane ilm was peeled between the optic nerve and fovea and stuffed into the optic disc pit. Comparison of sweptsource and enhanced depth imaging. The swept source oct system is capable of displaying realtime 2dimensional oct and obtaining a 3dimensional oct volume. An external 0 nm swept source is coupled to the chip, which contains waveguide structures for interferometric depth. The second method, sweptsource oct ssoct 2,69, timeencodes wavenumber. It is used for medical imaging and industrial nondestructive testing ndt.
Oldenburg a,b adepartment of physics and astronomy and the bbiomedical research imaging center, university of north carolina at chapel hill, chapel hill, nc 27599. Swept source oct and new nondamaging laser treatments three leading surgeons offer their insight and experience on imaging with optical coherence tomography as well as laser treatment options. University of coimbra swept source optical coherence. Swept source oct before surgery and then 1 week and 1, 3, and 6 months after surgery, then up to 4 years later. Fourierdomain oct fd oct 25 uses a broadband light source and achieves spectral discrimination with a dispersive spectrometer in the detector arm. The advantage of swept source oct is the tremendous ability to visualize every level of involvement. The second method, swept source oct ss oct 2,69, timeencodes wavenumber by rapidly tuning a narrowband source through a broad optical bandwidth. Tailoring lasers for specific swept source oct applications. Jun 01, 2016 swept source optical coherence tomography ss oct was introduced in clinical practice in 2012. Retinal physician the clinical utility of sweptsource oct. Comparison of a commercial spectraldomain oct and swept. Sweptsource oct and sweptsource oct angiography before and. Recent findings ss oct offers improvements in visualizing the vitreous, retina, choroid, and. The aim of the project was to develop full field swept source oct ffssoct, charting.
Development of phasestabilized sweptsource oct for the. Full field swept source optical coherence tomography. Configurations of the object arm with tunable lens. Swept source optical coherence tomography ss oct is emerging as one of the best methods within the oct family as it has enabled higher frame rate. The principle of swept source oct ss oct has first been demonstrated 2 years after sdoct in 1997 6 and was. The patient underwent a comprehensive ocular examination and imaging tests as. However, there are only very few reports on the use of sd oct, and data on the newlyintroduced swept source ss oct are lacking 2,3,4. Optical coherence tomography oct has been found to be useful in the evaluation of retinal hemorrhages and in the detection and characterization of associated vitreoretinal abnormalities in patients with sbs. To overcome scattering by the rpe, which disabled visualization of deeper lying structures, a longer wavelength was adopted for this machine 1050 nm vs 840 nm in sd oct. Design of a swept source, anatomical oct system for pediatric bronchoscopy kushal c. Imaging at 850nm permits higher axial resolution and appears to provide higher inner retinal layer contrast than 1050nm. Swept source optical coherence tomography angiography. W hen we refer to swept source optical coherence tomography ss oct, swept source refers to the type of laser incorporated into the device. Systems and methods for the spectral calibration of swept source.
Michalewska and others published sweptsource oct find, read and cite all the research you need on researchgate. Silverstone, the most powerful tool yet for examining the retina, is the only ultrawidefield imaging device with integrated swept source oct. Iolmaster 700 figure 1 now incorporates swept source oct technology, making it the first swept source biometry device, claims manufacturer carl zeiss meditec. Ultra highspeed swept source oct imaging of the anterior segment of human eye at 200 khz with adjustable imaging range michalina gora1, karol karnowski1, maciej szkulmowski1, bartlomiej j.
A spectral domain oct uses a dispersive detector, like a grating and a linear detector array, to separate the different wavelengths. The detector responses for swept source and fourier domain oct are eqs. The cells in the vitreous, the retinal thickening with loss of laminations, and the choroidal thickening associated with the retinochoroiditis are all clearly demonstrated in a single scan. Thorlabs swept source optical coherence tomography system is ideal for imaging highly scattering samples such as small animals and biological tissue. Swept source oct advantages enables balanced and polarization diverse detection schemes longer wavelengths, such as 1060nm and 0nm, enable deeper penetration into tissue increased imaging depth range from slower signal rolloff high snr and resolution in a compact, rugged package. The memsvcsel source used in these swept source oct ss oct systems produces light with a much longer coherence length than broadband sources, enabling. Validation of swept source optical coherence tomography ss oct for the diagnosis of smooth surface. The use of swept source oct angio in diagnosis and. Optical coherence tomography oct is a noninvasive volumetric imaging technique that offers micron scale resolution over several millimetres of depth penetration in tissue. Frequencyswept light sources for optical coherence. Because of its deeper penetration and faster acquisition time, ss oct has the ability to visualize choroid, vitreous, and retinal structures behind dense preretinal hemorrhages. Comparison of swept source optical coherence tomography and.
Frequency swept light sources for optical coherence tomography in the 1060nm range marschall, sebastian publication date. Ignacio floresmoreno, luis ariasbarquet, jorge ruizmedrano, jose m. We dont see the choroid as well with sd oct as we do with swept source oct. Plex elite 9000, carl zeiss meditec oct using an oct angiography octa scanning protocol. To evaluate the role of swept source anterior segment optical coherence tomography as oct in the diagnosis and management of laser in situ keratomileusis lasik flaprelated complications. Macular disease detection with a swept source optical coherence tomography based biometry device in patients scheduled for cataract surgery. Jul 08, 2019 background this comparative study aimed to demonstrate the differences between swept source oct ss oct 10 nm and spectral domain oct sd oct 840 nm for the identification and measurement of anterior chamber angle aca structures. The width of the 1050nm water absorption window limits the achievable axial resolution 24. May 2019 stateoftheart commercial the evolution of oct. A swept source oct encodes the optical frequency in time with a spectrally scanning source. We demonstrate a swept source optical coherence tomography platform with an electrically tunable lens etl for versatile 3d in vivo imaging of both the eyes anterior segment and the retina.
Ss oct improved the depth of imaging and the scan speed, thus adding novel algorithms and features such as for vitreous and vitreoretinal interface evaluation, choroid segmentation and mapping, oct angiography and. Jan 01, 2020 swept source octa provides better visualization of the neovascular network, choriocapillaris, and choroid compared with fa and icga. Swept source oct angiography of the retinal vasculature using intensity di. Fujimoto1,3, 1 department of electrical engineering and computer science, and research laboratory of. Comparative analysis of 2 swept source optical coherence tomography biometers. Comparison of choroidal thickness measurements between. Pdf validation of sweptsource optical coherence tomography. Sensitivity advantage of swept source and fourier domain. Wide field swept source imaging in one single shot haagstreit. In a study the exclusive barrett true k with tk formula improved the outcome prediction compared to the barrett true k with classic ks within 0. Clinical advantages of sweptsource oct and new non. Development of an optical coherence tomography for small animal retinal imaging.
Impact of swept source optical coherence tomography on. Swept source ss oct has now been developed, with a tunable laser operating using a longerwavelength light source 1050 nm and a highspeed photodetector instead of a spectrometer. Swept source optical coherence tomography for small animals. Optical coherence tomography oct has recently become a powerful tool for noninvasive tomographic imaging in transparent and turbid specimens 1,2,3. Consult topcon europe medicals entire dri oct1, atlantis swept source oct catalogue on medicalexpo. Dri oct, topcon japan is the latest milestone in retinal and choroidal imaging. Ultra long coherence length flexible scanning rate, tuning range, and direction. Clinical advantages of sweptsource oct and new nondamaging. Other core elements needed for oct, including the interferometer, scanning, and focusing optics can be the same. Novel perspectives on sweptsource optical coherence. The patient underwent a comprehensive ocular examination and imaging tests as part of the evaluation of her condition. Deeper canons deep scanning swept source technology allows better penetration of cataracts, hemor rhages, blood vessels and sclera and at the same time optimizes capture of retinal and choroidal data all in a single shot. This prospective study included 25 eyes with lasik flaprelated complications imaged using swept source as oct between february and august 2016 at alforsan eye centre, assiut, egypt.
As swept source oct is a variation of fourier domain oct, similar to spectral domain oct, it maintains its advantage of sensitivity over time domain oct. Therefore the integrated reflectivity in the perpendicular polarization effective imaging depth of oct on tooth depends on the channel of ps oct could be used to represent the severity please cite this article in press as. In all eyes a complete ophthalmic examination, swept source oct and ssocta were performed. Ultrahigh speed 1050nm swept source fourier domain oct. Phasesensitive swept source optical coherence tomography for. Swept source optical coherence tomography using an all. Clinical evaluation of a new swept source optical coherence biometer that uses individual refractive indices to measure axial length in cataract patients. Small form factor oem configuration with emi shield features calibri 11 bold bulleted list is calibri 10 point bullet 2 goes here bullet 3 goes here bullet 4 goes here bullet 5 goes here. Dri oct1, atlantis swept source oct topcon europe medical. Swept source oct systems ssoctsystems swept source systems are an alternate way to obtain the spectrogram by using a frequency swept laser or a tunable laser with just a single detector and without dispersion components, which is referred to as ss oct. Oct, swept source oct uses a single photodiode detector. Optical coherence tomography oct provides multiple thickness maps from one wide field scan.
Osa swept source optical coherence tomography and tunable. Optical coherence tomography oct is a noninvasive biomedical imaging tech nique that provides high speed and high resolution three dimensional and cross. While sd oct uses a spectrometer for wavelength separation, ss oct features a light source which sweeps the wavelength in time. Introduction optical coherence tomography angiography octa is a fast, easy, noninvasive, threedimensional imaging method to visualize intravascular. The setup of spectraldomain oct left pane and swept source oct right pane mainly differs with respect to the light source and detector.
Swept source oct, which uses a wavelength laser source to scan the eye, has been shown to have better tissue penetration compared to partial coherence interferometry pci technology. To overcome scattering by the rpe, which disabled visualization of deeper lying structures, a longer wavelength was adopted for this machine 1050 nm vs 840 nm in sd oct, and photodetectors instead of ccd. Swept source optical coherence tomog raphy ss oct, topcon medical system, japan is known to have longer wavelength than spectral. Kaluzny2, robert huber3, andrzej kowalczyk1, maciej wojtkowski1, 1 institute of physics, nicolaus copernicus university, ul. Ultrahigh speed 1050nm swept source fourier domain oct retinal and anterior segment imaging at 100,000 to 400,000 axial scans per second benjamin potsaid1,2, bernhard baumann1,3, david huang4, scott barry2, alex e. Methods 57 participants 12 glaucomatous, 8 ocular hypertensive and 74 normal eyes. Iolmaster 700 swept source oct zeiss medical technology. The imaging tests included color fundus imaging topcon, tokyo, japan, digital fundus af imaging, fa and swept source oct with oct angio triton topcon oct. Silverstone produces a 200 singlecapture retinal image of unrivaled clarity in less than. Frequency swept light sources for optical coherence tomography in the 1060nm range. Swept source optical coherence tomog raphy ssoct, topcon medical system, japan is known to have longer wavelength than spectral. Silverstone is the most powerful tool yet for examining the retina. Optical setup of spectrometer based oct sd oct in the upper left inset and swept source oct ss oct in the upper right inset.
Standard optical systems in ophthalmology are strictly dedicated either to retinal or to anterior segment imaging due to the refractive properties of the eye. Sweptsource oct and sweptsource oct angiography before. Swept source octa was performed from 2015 9 patients. Relevance of sweptsource anterior segment optical coherence.
After core vitrectomy, internal limiting membrane ilm was peeled between the. Optical coherence tomography oct is an imaging technique that uses lowcoherence light to capture micrometerresolution, two and threedimensional images from within optical scattering media e. Oct technology evolved in the last two decades from timedomain to spectral domain and recently to the sweptsource octs ss oct. Highspeed, sweptsource optical coherence tomography. Pdf ultra highspeed swept source oct imaging of the.
Thorlabs vega series 0 nm oct imaging systems provide the flexibility required for longrange and highspeed imaging applications. It presents a collection of images and brief annotations of the microstructures of both the normal and diseased eye captured on swept source optical coherence. Frequencydomain oct spectraldomain oct swept source oct swept source oct advantages enables balanced and polarization diverse detection schemes longer wavelengths, such as 1060nm and 0nm, enable deeper penetration into tissue. Instead of sampling the received spectrum over a finite wavelength, the sample is. Oct imaging methodology swept source oct optical source swept source tunable laser. Swept source oct another fourier domain oct technology 510x faster than existing sd oct instruments also better sensitivity with less rolloff from potsaid et al, optics express 2010. Sweptsource optical coherence tomography world scientific. With xephilio oct s1 canon introduces revolutionary swept source technology allowing you to capture widefield images of up to 23 mm in a single scan. Vcsel swept source hsl1 center wavelength scan range maximum scan speed coherence length output power peak measurement data applications swept source oct ss oct spectroscopy interferometry optical sensing lidar features 1060nm wavelength range single mode lasing. Because of its deeper penetration and faster acquisition time, ss oct has the ability to visualize choroid, vitreous, and retinal structures behind dense preretinal. To overcome scattering by the rpe, which disabled visualization of deeper lying structures, a longer wavelength was adopted for this machine 1050 nm vs 840 nm in sd oct, and photodetectors instead of ccd cameras led to a further increase.
Request pdf clinical applications and advantages of swept source oct the topcon dri triton is an optical coherence tomographer oct with a builtin. The total keratometry tk of zeiss iolmaster 700 allows you to directly measure the posterior corneal surface using swept source oct. With swept source oct, we get good signal strength and thus good image quality in the vitreous and choroid in the same image see figure 1. Larin a, b, c, a department of electrical and computer engineering, university of houston, houston, tx 77204, usa b biomedical engineering program, university of houston, houston, tx 77204, usa c. Swept source oct represents the next evolution of oct technology its higher speed, higher sensitivity, and expected longer wavelength light source, offer important advantages over existing commercial sd oct devices ss oct will likely further expand the applications and importance of oct. Methods in a crosssectional study, patients with primary open angle glaucoma poag and agematched control subjects underwent ss oct and edi oct bscans of the onh in a single visit. Methods sixty seven eyes from 67 healthy subjects underwent aca imaging at the nasal and temporal sides using ss oct and sd oct with different wavelength. Comparison of spectral domain and swept source optical. The ocs0ss includes a handheld probe, probe mount, and.
Imaging modalities and image viewing options are detailed below. Development of phasestabilized sweptsource oct for the ultrasensitive quantification of microbubbles r. Aug 14, 2019 optical setup of spectrometer based oct sd oct in the upper left inset and swept source oct ss oct in the upper right inset. To date, the gold standard in swept source oct is the iolmaster 700 carl. Furthermore, swept source oct has several major advantages over. Largest selection of laser specifications available.
Cirrus hd, carl zeiss meditec, usa optical coherence tomography oct and swept source ss. Imaging of the lamina cribrosa using sweptsource optical. Design of a swept source, anatomical oct system for. Electroninjection detectors for swept source optical. Aims to compare swept source optical coherence tomography ss oct and enhanced depth imaging spectraldomain oct edi oct in quantitative assessment of optic nerve head onh parameters. Atlas of swept source optical coherence tomography springerlink. Backgroundaims to assess the agreement in measuring retinal nerve fibre layer rnfl thickness between spectraldomain sd. The clinical utility of sweptsource oct angiography for. Optical coherence tomography is based on lowcoherence interferometry, typically employing near.
954 741 502 930 389 59 515 508 1625 786 146 753 324 1595 1320 732 1530 867 1422 940 558 1704 653 395 1739 1719 1610 1807 1050 1535 470 1818 1097 382 1036 1570 1452 34 117