3D printed phantoms of retinal photoreceptor cells for evaluating adaptive optics imaging modalities

2018 ◽  
Author(s):  
Anant Agrawal ◽  
Nikita Kedia ◽  
Zhuolin Liu ◽  
Ryan Sochol ◽  
Daniel X. Hammer
Keyword(s):  
Adaptive Optics ◽  
Photoreceptor Cells ◽  
Imaging Modalities ◽  
Retinal Photoreceptor ◽  
Adaptive Optics Imaging ◽  
3D Printed

Spindle shaped bodies in foveolar cones of the baboon retina

1989 ◽  
Vol 47 ◽  
pp. 960-961
Author(s):  
W. Krebs ◽  
I. Krebs
Keyword(s):  
Cross Sections ◽  
Inclusion Bodies ◽  
Photoreceptor Cells ◽  
Papio Anubis ◽  
Retinal Photoreceptor ◽  
Age Related ◽  
Cone Cells ◽  
Membrane Bound ◽  
Oriented Parallel ◽  
Shaped Inclusion

Various inclusion bodies occur in vertebrate retinal photoreceptor cells. Most of them are membrane bound and associated with phagocytosis or they are age related residual bodies. We found an additional inclusion body in foveal cone cells of the baboon (Papio anubis) retina.The eyes of a 15 year old baboon were fixed by immersion in cacodylate buffered glutaraldehyde (2%)/formaldehyde (2%) as described in detail elsewhere . Pieces of retina from various locations, including the fovea, were embedded in epoxy resin such that radial or tangential sections could be cut.Spindle shaped inclusion bodies were found in the cytoplasm of only foveal cones. They were abundant in the inner segments, close to the external limiting membrane (Fig. 1). But they also occurred in the outer fibers, the perikarya, and the inner fibers (Henle’s fibers) of the cone cells. The bodies were between 0.5 and 2 μm long. Their central diameter was 0.2 to 0. 3 μm. They always were oriented parallel to the long axis of the cone cells. In longitudinal sections (Figs. 2,3) they seemed to have a fibrous skeleton that, in cross sections, turned out to consist of plate-like (Fig.4) and tubular profiles (Fig. 5).

scholarly journals A method for space-variant deblurring with application to adaptive optics imaging in astronomy

2015 ◽  
Vol 579 ◽  
pp. A1 ◽  
Author(s):  
A. La Camera ◽  
L. Schreiber ◽  
E. Diolaiti ◽  
P. Boccacci ◽  
M. Bertero ◽  
...  
Keyword(s):  
Adaptive Optics ◽  
Adaptive Optics Imaging ◽  
Space Variant

scholarly journals Multi-conjugated adaptive optics imaging of distant galaxies –  a comparison of Gemini/GSAOI and VLT/HAWK-I data

2017 ◽  
Vol 472 (1) ◽  
pp. 217-223 ◽  
Author(s):  
Mischa Schirmer ◽  
Vincent Garrel ◽  
Gaetano Sivo ◽  
Eduardo Marin ◽  
Eleazar R. Carrasco
Keyword(s):  
Adaptive Optics ◽  
Distant Galaxies ◽  
Adaptive Optics Imaging

scholarly journals Laser-Guide-Star Satellite for Ground-Based Adaptive Optics Imaging of Geosynchronous Satellites

2017 ◽  
Vol 54 (3) ◽  
pp. 621-639 ◽  
Author(s):  
Weston A. Marlow ◽  
Ashley K. Carlton ◽  
Hyosang Yoon ◽  
James R. Clark ◽  
Christian A. Haughwout ◽  
...  
Keyword(s):  
Adaptive Optics ◽  
Laser Guide Star ◽  
Adaptive Optics Imaging ◽  
Guide Star ◽  
Laser Guide ◽  
Geosynchronous Satellites

scholarly journals Probing post-AGB metamorphosis with NIR Adaptive Optics Imaging

2006 ◽  
Vol 2 (S234) ◽  
pp. 71 ◽  
Author(s):  
C. Sánchez Contreras ◽  
D. Le Mignant ◽  
R. Sahai ◽  
F. H. Chaffee ◽  
M. Morris
Keyword(s):  
Adaptive Optics ◽  
Adaptive Optics Imaging

scholarly journals Closing the gap between Earth-based and interplanetary mission observations: Vesta seen by VLT/SPHERE

2019 ◽  
Vol 623 ◽  
pp. A6 ◽  
Author(s):  
R. JL. Fétick ◽  
L. Jorda ◽  
P. Vernazza ◽  
M. Marsset ◽  
A. Drouard ◽  
...  
Keyword(s):  
Adaptive Optics ◽  
Spatial Resolution ◽  
Ground Truth ◽  
Space Mission ◽  
Contour Extraction ◽  
Dawn Mission ◽  
The North ◽  
Adaptive Optics Imaging ◽  
Interplanetary Missions

Context. Over the past decades, several interplanetary missions have studied small bodies in situ, leading to major advances in our understanding of their geological and geophysical properties. These missions, however, have had a limited number of targets. Among them, the NASA Dawn mission has characterised in detail the topography and albedo variegation across the surface of asteroid (4) Vesta down to a spatial resolution of ~20 m pixel−1 scale. Aims. Here our aim was to determine how much topographic and albedo information can be retrieved from the ground with VLT/SPHERE in the case of Vesta, having a former space mission (Dawn) providing us with the ground truth that can be used as a benchmark. Methods. We observed Vesta with VLT/SPHERE/ZIMPOL as part of our ESO large programme (ID 199.C-0074) at six different epochs, and deconvolved the collected images with a parametric point spread function (PSF). We then compared our images with synthetic views of Vesta generated from the 3D shape model of the Dawn mission, on which we projected Vesta’s albedo information. Results. We show that the deconvolution of the VLT/SPHERE images with a parametric PSF allows the retrieval of the main topographic and albedo features present across the surface of Vesta down to a spatial resolution of ~20–30 km. Contour extraction shows an accuracy of ~1 pixel (3.6 mas). The present study provides the very first quantitative estimate of the accuracy of ground-based adaptive-optics imaging observations of asteroid surfaces. Conclusions. In the case of Vesta, the upcoming generation of 30–40 m telescopes (ELT, TMT, GMT) should in principle be able to resolve all of the main features present across its surface, including the troughs and the north–south crater dichotomy, provided that they operate at the diffraction limit.

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