Since its inception in the 1990s, optical coherence tomography has become a crucial tool in the practice of ophthalmology by informing diagnosis, disease monitoring and long-term prognosis. The ability of this technology to capture the peripheral retina has allowed for new and expanded clinical application. in the course of its use and development, OCT technology has spawned widefeld and ultra-widefield imaging in addition to high-speed and high-resolution imaging. In 2019, the international Widefield Imaging Study Group defined widefield imaging as a field-of-view (FOV) of approximately 60- to 100-degree, capturing the mid-periphery of the retina up to the posterior edge of the vortex vein ampulla. Until recently, capturing the far periphery of the retina with OCT was nearly impossible. However, the Heidelberg Spectralis HRA-OCT (Heidelberg Engineering USA), the Silverstone (Optos PLC Edinburgh), the Plex Elite 9000 (Zeiss, Oberkochen, Germany) and the Xephilio OCT-S1 (Canon Medical Systems, Japan) have introduced widefield OCT imaging capabilities. A company called Toward Pi has also developed a Swept-source OCT machine with an 81 x 68-degree field of view and an A-scan speed of 400-kHz Recently, our group developed a molecular contrast retinal OCT system with a 400-kHz vertical-cavity surface-emitting laser (VCSE) source, polarization diversity (PD) detection, and ultra-wide FOV retinal scanning device. The ultra-wide FOV PD-OCT system is capable of acquiring melanic contrast imaging as well as scattering contrast over 120-dgree FOV in a single shot with a non-contact approach. Using the system, our team has initiated studies investigating the clinical utility of wide FO’V PD-OCT imaging. In this presentation, will introduce our clinical cases studies including retinitis pigmentosa and choroidal melanoma. In addition, pathological features extracted from our data will be compared with other conventional imaging modalities such as retinal fundus, fundus autofluorescence
About the speaker
Dr. Ju Is an Assistant Professor at the Department of Oph1halmoJogy & Visual Sciences, Faculty of Medicine, Untverslty of British Columbia. His research Is foeusad on the development of optical Imaging systems and signal processing algorithms
