title: Automated retinal shadow compensation of optical coherence tomography images.
abstract: We present an automated numerical method of compensating for retinal shadows in the choroid. In this method, signal extinction caused by retinal vessels is estimated by subtracting median A-scans obtained from beneath the retinal vessels and A-scans from the surrounding area. Adding the obtained offset vector to A-scans from beneath the retinal vessels allows compensating for shadows in the choroid. In vivo imaging of the human eye was performed by 840-nm-band standard resolution spectral domain optical coherence tomography (SD-OCT), and choroidal vasculature projection images were calculated. Removal of retinal shadows distinctly improved the readability of choroidal images.
authors.affiliation: University of Tsukuba, Computational Optics Group, 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8573 Japan. tapio.fabritius@ee.oul.fi
authors.forename: Tapio
authors.initials: T
authors.lastname: Fabritius
authors.forename: Shuichi
authors.initials: S
authors.lastname: Makita
authors.forename: Yongjoo
authors.initials: Y
authors.lastname: Hong
authors.forename: Risto
authors.initials: R
authors.lastname: Myllylä
authors.forename: Yoshiaki
authors.initials: Y
authors.lastname: Yasuno
mesh_terms: D000465:Algorithms; D016477:Artifacts; D002829:Choroid / Q000166:cytology; D006801:Humans; D007089:Image Enhancement / Q000379:methods; D007090:Image Interpretation, Computer-Assisted / Q000379:methods*; D021621:Imaging, Three-Dimensional / Q000379:methods*; D015203:Reproducibility of Results; D012171:Retinal Vessels / Q000166:cytology*; D042262:Retinoscopy / Q000379:methods*; D012680:Sensitivity and Specificity; D041623:Tomography, Optical Coherence / Q000379:methods*