Photonics West Bigins

The biggest annual event of OCT community begins. BiOS, a part of SPIE Photonics West starts on Jun. 23rd. in San Francisco. Almost all members of COG are now rushing into that city. We have 7 oral presentations including 6 from our core member and 1 from our collaborator. See this page to see the abstracts and add our presentations to your conference agenda. Come and see our talks!

Saturday 23rd

• [2:00pm-2:15pm, Room 306] S. Makita et al., "High-sensitive blood flow imaging of the retina and choroid by using double-beam optical coherence angiography."
• [5:00pm-5:15pm, Room 306] Y. Lim et al., "Polarization Sensitive Corneal and Anterior Segment Swept-Source Optical Coherence Tomography."
• [5:15pm-5:30pm, Room 306] A. Miyazawa et al., "Tissue discrimination in anterior eye using three optical parameters obtained by polarization sensitive optical coherence tomography."

Sunday 24th

• [5:30pm-5:45pm, Room 306] Y. Ikuno et al., "Clinical application of high-penetration optical coherence tomography using 1060-nm wevelength."

Monday 25th

• [1:00pm-1:15pm, Room 303] K. Kurokawa et al., "Adaptive optics spectral domain optical coherence tomography with one-micrometer light source."

Tuesday 26th

• [11:15am-11:30am] F. Jaillon et al., "BM-mode scanning with parabolic phase modulation for full range Doppler optical tomography."

Wednesday 27th

• [8:45am-9:00am] M. Yamanari et al., "Full range polarization-sensitive swept-source optical coherence tomography at 1-um with polarization modulation and BM-mode scan."

One-Micrometer Adaptive Optics for Scanning Laser Ophthalmoscope

Our colleague Kazuhiro Kurokawa recently reported an adaptive optics scanning laser ophthalmoscope (AO-SLO) with a one-micrometer probe beam. This AO-SLO is the world first demonstration of an adaptive-optics based high-resolution retinal imager with this wavelength band. The mosaic of cone photoreceptors and the flow of blood cells of in vivo human eyes were visualized. The details were published in Optics Express.

>> Full article on the journal website (open access)

Full-Range Doppler OCT with High Dynamic Range

Franck Jaillon from COG in the University of Tsukuba demonstrated a new full range spectral domain optical coherence tomography (OCT), so called parabolic BM-scan method. This method is a variation of full-range OCT based BM-scan method, but possesses higher tolerance to the sample motion and higher dynamic range of Doppler measurement. In this paper, in vivo investigation of human eye was performed, and it was found that this parabolic BM-scan method is useful for office-based in vivo measurements. The details of this method were published in Optics Express.

>> Article on the journal web site (open access)

Yasuno became associate editor of Optics Express

Our colleague Yoshiaki Yasuno became an associate editor of Optics Express. Optics Express is organized by Optical Society of America, and is one of the highest impact journals in the field of optics. Yasuno edits papers mainly of biomedical optics.

Generalized Jones Matrix OCT

Shuichi Makita and his colleagues in COG recently reported the generalization of Jones matrix optical coherence tomography (Jones OCT) in Optics Express. In this paper, we generalized theoretical model of Jones OCT which provides us not only phase retardation tomography but local birefringence tomography of biological and medical samples. The noise property of this generalized Jones OCT is also carefully analyzed. This method was applied to visualize the details of an anterior eye chamber, and successfully contrast a trabecular meshwork. The details are described in the following paper.

>> Full text (PDF) in Journal web site (open access)

Citation: S. Makita, M. Yamanari, and Y. Yasuno, "Generalized Jones matrix optical coherence tomography: performance and local birefringence imaging," Opt. Express 18, 854-876 (2010).

doi:10.1364/OE.18.000954

Investigation of Choroidal Thickness

Our collaborator Yasushi Ikuno (Osaka University Hospital) investigated the choroidal thickness of healthy Japanese. The chorid is one of the tissues in the eye ant it locates beneath the retina, and which had not been possible to be clearly visualized by OCT. He investigated the choroid by using a brand new high-penetration OCT made by our group (COG, Tsukuba). After the examination of 86 eyes, he found that the choroidal thickness varies around its position, and is associated the refractive error of the eye, axial eye length, and the age of the subject. The details are reported in Investigative Ophthalmology and Visual Science (IOVS, a journal of association for research in vision and ophthalmology).

>> Abstract in journal website

>> Request reprint via e-mail (please indicate the following citation in the e-mail).

Citation: Y. Ikuno, K. Kawaguchi, T. Nouchi, and Y. Yasuno, "Choroidal thickness in healthy Japanese Subjects," Invest. Ophthalmol. Vis. Sci., e-first publication.
doi:10.1167/iovs.09-4383

Birefringence Imaging of Necrotizing Scleritis

Our colleagues Masahiro Miura published a case report of necrotizing scleritis, which is an inflammation disease of sclera. The anterior eye of a patient was scanned by our anterior eye segment polarization sensitive optical coherence tomography prototype (AS-PS-OCT). The tissue selective imaging ability of AS-PS-OCT visualized the abnormal thinning of the eye. The details were published in Ophthalmic Surgery, Lasers and Imaging.

>> Abstract (PubMed)

>> Request reprint via e-mail (please indicate the following citation in the e-mail.)

Citation: M. Miura, M. Yamanari, T. Iwasaki, M. Itoh, T. Yatagai, and Y. Yasuno, "Polarization-sensitive optical coherence tomography of necrotizing scleritis," Ophthalmic Surg. Lasers Imaging 40, 607-610 (2009).