Article
Intraoperative OCT (iOCT) for the posterior segment surgery
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Published: | September 21, 2010 |
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Purpose: To evaluate a new surgical microscope-mounted OCT-Camera for intraoperative diagnosis and assistance.
Patients and methods: With a newly developed OCT camera (OPTOMEDICAL TECHNOLOGIES, Lübeck, Germany in cooperation with MOELLER-WEDEL, Wedel), which is mounted on a surgical microscope (Hi-R 900, MOELLER-WEDEL) with external display (MEDIS, MOELLER-WEDEL), 42 patients were imaged during routine posterior segment surgery. A non-contact 90D lens (EIBOS, MOELLER-WEDEL) or contact vitrectomy flat lens (DORC; Zuidland, Niederlande) were used. The OCT camera had a central wavelength of 840 nm, a depth of view of 5.2 mm and a zoom dependant field of view of 5 mm at maximal zoom. Acquisition speed was 10,000 A-scans/s. Image stacks, en-face OCT and 2D-real time imaging with additional volume scans were recorded.
Results: Intraoperative OCT (iOCT) can image the posterior segment with spectral domain quality. Retinal membrane structures were seen in real-time or as 2D or 3D reconstruction. Pathologies such as epiretinal membranes, macular holes and vitreomacular tractions could be visualized in high-resolution prior and during surgical removal. Surgical instruments could be localized during manipulation.
Conclusion: iOCT enables intraoperative high-resolution OCT imaging of posterior segment surgery. It provides a depth-resolved view of delicate tissue structures and enables an intraoperative control of the intended therapy. iOCT may become a new tool in eye surgery.
Supported by Medical Technology Grant, University of Luebeck.