Abstract
Abstract: :
Purpose: The OCT/SLO combines the confocal imaging capability of the scanning laser ophthalmoscope (SLO) with the tomographic scanning ability of optical coherence tomography (OCT). It is able to generate precisely registered OCT images in both longitudinal (B–scan) and coronal (C–scan) orientation, providing multidimensional retinal imaging. Previous studies have described the imaging characteristics of Idiopathic Polypoidal Choroidal Vasculopathies (IPCV) using conventional longitudinal OCT scans. The purpose of this study is to describe additional features of this disease entity revealed by coronal scanning using the OCT/SLO. Methods: A retrospective review of cases imaged with the OCT/SLO between January and November 2004 found 4 cases of IPCV whose diagnosis was confirmed by ICG. Coronal images from each of these cases were reviewed and superimposed upon corresponding ICG angiograms using Adobe Photoshop. The correlations between the anatomic changes seen in the OCT images and the choroidal vascular features revealed by ICG were studied . Results: RPE appearance was found to be more irregular and oftentimes mottled over the area of choroidal vascular dilatation and branching. RPE elevations seen in the longitudinal views appeared in coronal sections as bright (hyperreflective) circles within the deeper layers of the retina. When superimposed upon the ICG images, the smaller of these circular lesions appeared to correspond to areas of polypoidal dilatation, while the larger circular lesions seemed to correspond to RPE detachments, frequently adjacent to clear areas thought to represent subretinal fluid accumulation. Conclusions: Coronal OCT scanning more completely characterized the configuration and extent of the RPE abnormalities than was possible with longitudinal OCT imaging alone. These features could be easily referenced ICG angiograms since they shared a common planar perspective. Coronal OCT imaging may prove to be a valuable addition to clinical tools currently available for the in the evaluation of idiopathic choroidal polypoidal vasculopathy.
Keywords: imaging methods (CT, FA, ICG, MRI, OCT, RTA, SLO, ultrasound) • imaging/image analysis: clinical