scholarly journals Coded aperture correlation holography (COACH) with a superior lateral resolution of FINCH and axial resolution of conventional direct imaging systems

2021 ◽  
Author(s):  
Angika Bulbul ◽  
Nathaniel Hai ◽  
Joseph Rosen
Keyword(s):  
Imaging Systems ◽  
Lateral Resolution ◽  
Coded Aperture ◽  
Axial Resolution ◽  
Direct Imaging

scholarly journals Interferenceless Coded Aperture Correlation Holography with Point Spread Holograms of Isolated Chaotic Islands for 3D Imaging

2021 ◽  
Author(s):  
Nitin Dubey ◽  
Joseph Rosen
Keyword(s):  
3D Imaging ◽  
Imaging System ◽  
Signal To Noise Ratio ◽  
Three Dimensional ◽  
Image Sensor ◽  
Two Dimensions ◽  
Imaging Systems ◽  
Coded Aperture ◽  
Axial Resolution ◽  
Point Spread

Abstract Interferenceless coded aperture correlation holography (I-COACH) is an incoherent digital holographic technique with lateral and axial resolution similar to a regular lens-based imaging system. The properties of I-COACH are dictated by the shape of the system’s point response termed point spread hologram (PSH). As previously shown, chaotic PSHs which are continuous over some area on the image sensor enable the system to perform three-dimensional (3D) holographic imaging. We also showed that a PSH of an ensemble of sparse dots improves the system’s signal-to-noise ratio (SNR) but reduces the dimensionality of the imaging from three to two dimensions. In this study, we test the midway shape of PSH, an ensemble of sparse islands distributed over the sensor plane. A PSH of isolated chaotic islands improves the SNR of the system compared to continuous chaotic PSH without losing the capability to perform 3D imaging. Reconstructed images of this new system are compared with images of continuous PSH, dot-based PSH, and direct images of a lens-based system. Visibility, SNR, and the product of visibility with SNR are the parameters used in the study. We also demonstrate the imaging capability of a system with partial annular apertures. The reconstruction results have better SNR and visibility than lens-based imaging systems with the same annular apertures.

scholarly journals Source size and temporal coherence requirements of coded aperture type x-ray phase contrast imaging systems

2010 ◽  
Vol 18 (19) ◽  
pp. 19681 ◽  
Author(s):  
Peter R. T. Munro ◽  
Konstantin Ignatyev ◽  
Robert D. Speller ◽  
Alessandro Olivo
Keyword(s):  
Phase Contrast ◽  
Temporal Coherence ◽  
Source Size ◽  
Imaging Systems ◽  
Phase Contrast Imaging ◽  
Coded Aperture ◽  
Contrast Imaging ◽  
X Ray

scholarly journals Measurements with Pinhole and Coded Aperture Gamma-Ray Imaging Systems

2010 ◽  
Author(s):  
Ana Claudia Raffo-Caiado ◽  
Alexander A Solodov ◽  
Najeb M Abdul-Jabbar ◽  
Jason P Hayward ◽  
Klaus-Peter Ziock
Keyword(s):  
Gamma Ray ◽  
Imaging Systems ◽  
Coded Aperture ◽  
Gamma Ray Imaging

Enhanced axial resolution of the cytoskeleton in fluorescence microscopy by standing-wave excitation

1993 ◽  
Vol 51 ◽  
pp. 88-89
Author(s):  
Frederick Lanni ◽  
Brent Bailey ◽  
Daniel L. Farkas ◽  
D. Lansing Taylor
Keyword(s):  
Fluorescence Microscopy ◽  
Standing Wave ◽  
Focal Plane ◽  
Information Transfer ◽  
High Speed ◽  
Depth Resolution ◽  
Depth Of Field ◽  
Imaging Method ◽  
Axial Resolution ◽  
Direct Imaging

When the depth-of-field of a microscope is less than the axial dimension of the specimen, 3d information can be derived from a set of images recorded as the specimen is stepped through the object focal plane of the microscope. This procedure, known as optical sectioning microscopy (OSM), is the same in direct imaging and confocal scanning. For both of these cases in fluorescence microscopy, axial (depth) resolution is more limited than transverse resolution, for fundamental reasons. Our research aim has been to enhance axial resolution in fluorescence OSM (FOSM) while retaining the high-speed information transfer characteristics of direct imaging that are necessary for 3d studies of living cells in culture.Standing-wave fluorescence microscopy (SWFM) is a direct imaging method in which the object is illuminated by a three-dimensional field of planar interference fringes (standing waves) oriented parallel to the focal plane of the microscope. This field is produced in the specimen by crossing two coherent, collimated, s-polarized beams of equal amplitude directed through the specimen at complementary angles (θ, π -θ) relative to the axis of the microscope.

3-D printed photoreceptor phantoms for evaluating lateral resolution of adaptive optics imaging systems

2019 ◽  
Vol 44 (7) ◽  
pp. 1825 ◽  
Author(s):  
Nikita Kedia ◽  
Zhuolin Liu ◽  
Ryan D. Sochol ◽  
Johnny Tam ◽  
Daniel X. Hammer ◽  
...  
Keyword(s):  
Adaptive Optics ◽  
Imaging Systems ◽  
Lateral Resolution ◽  
Adaptive Optics Imaging

Improved depth resolution in coded aperture γ-ray imaging systems

1976 ◽  
Vol 23 (1) ◽  
pp. 606-612
Author(s):  
Arden Steinbach ◽  
Albert Macovski
Keyword(s):  
Depth Resolution ◽  
Imaging Systems ◽  
Coded Aperture ◽  
Γ Ray

scholarly journals The relationship between wave and geometrical optics models of coded aperture type x-ray phase contrast imaging systems

2010 ◽  
Vol 18 (5) ◽  
pp. 4103 ◽  
Author(s):  
Peter R. Munro ◽  
Konstantin Ignatyev ◽  
Robert D. Speller ◽  
Alessandro Olivo
Keyword(s):  
Phase Contrast ◽  
Geometrical Optics ◽  
Imaging Systems ◽  
Phase Contrast Imaging ◽  
Coded Aperture ◽  
Contrast Imaging ◽  
X Ray ◽  
The Relationship
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