guide to optical coherence tomography interpretation

#Guide to optical coherence tomography interpretation how to#

These models also have increased fundus camera resolution and focus options for detailed image capture compared with prior TD-OCT ( Table 2). With eye tracking capability and image registration, artifacts are much less common than in prior technology. 3,4 The increased speed and resolution provide an enhanced ability to visualize retinal layers. Today’s SD-OCT can also provide an axial resolution of 3µm to 6µm within tissues, compared with previous TD-OCT technology, which had a maximum resolution of 10µm. 1,2 This improvement is beneficial to the clinician because it minimizes image artifacts, makes 3D imaging possible and increases image resolution. While the earliest time-domain (TD) OCT technology could only acquire 400 scans per second, current SD-OCT models, depending on the manufacturer, can capture between 26,000 and 70,000 axial-scans per second ( Table 1 ). *Cirrus OCT (5000 model with version 6.5 software) acquires 68,000 scans per second with fundus photos Spectralis SD-OCT (Heidelberg Engineering) 6 Comparison of Four Commercially Available SD-OCT ModelsĬirrus HD-OCT 5000 (Carl Zeiss Meditec) 2

#Guide to optical coherence tomography interpretation how to#

This article outlines the basics of OCT imaging and walks you through how to analyze retinal nerve fiber layer (RNFL) thickness, macular thickness and ganglion cell complex using each model. The technological growth in ocular imaging has allowed for profound advancements in the clinician’s ability to recognize subtle abnormalities, differentiate stability from progression in ocular pathology and identify disease stages.Ĭlinicians have four prominent commercially available spectral-domain (SD) OCT models to choose from: Spectralis SD-OCT (Heidelberg Engineering), 3D OCT-2000 (Topcon Medical Systems), Avanti RTVue XR (Optovue), and Cirrus HD SD-OCT 5000 (Carl Zeiss Meditec). 2011 118:2403–8.Optical coherence tomography (OCT) has evolved over the last several years from a device used in only a few practices to one found in many primary eye care clinics. Variation in optic nerve and macular structure with age and race with spectral-domain optical coherence tomography. Girkin CA, McGwin G, Jr, Sinai MJ, Sekhar GC, Fingeret M, Wollstein G, et al. Macular thickness measurements in healthy eyes using six different optical coherence tomography instruments. Wolf-Schnurrbusch UE, Ceklic L, Brinkmann CK, Iliev ME, Frey M, Rothenbuehler SP, et al. Relationship between optical coherence tomography-measured central retinal thickness and visual acuity in diabetic macular edema. Browning DJ, Glassman AR, Aiello LP, Beck RW, Brown DM, et al. 2014 132:1113–22.ĭiabetic Retinopathy Clinical Research Network. Reproducibility of spectral-domain optical coherence tomography retinal thickness measurements and conversion to equivalent time-domain metrics in diabetic macular edema. Bressler SB, Edwards AR, Chalam KV, Bressler NM, Glassman AR, et al. 1991 254:1178–81.ĭiabetic Retinopathy Clinical Research Network Writing Committee. Huang D, Swanson EA, Lin CP, Schuman JS, Stinson WG, Chang W, et al.