Publications associées à Théorème de Radon

Enhancement of extended depth of field by digital focusing

Theo Lasser, Rainer Leitgeb, Martin Villiger, Cédric Blatter

With the use of a Bessel-like illumination beam produced by an axicon lens an extended depth of field can be achieved. The resulting illumination pattern exhibits a strong central lobe extending over 300um along the optical axis without diffraction. Here w ...

2008

Direct Fourier Tomographic Reconstruction Image-To-Image Filter

Jean-Philippe Thiran, Meritxell Bach Cuadra, Dominique Zosso

We present an open-source ITK implementation of a direct Fourier method for tomographic reconstruction, applicable to parallel-beam x-ray images. Direct Fourier reconstruction makes use of the central-slice theorem to build a polar 2D Fourier space from th ...

2007

Biological cell (pollen grain) refractive index tomography with digital holographic microscopy

Christian Depeursinge, Etienne Cuche, Pierre Marquet, Florian Charrière

This paper present a novel approach to perform the tomography of biological specimen based on Digital Holographic Microscopy (DHM). A hologram results from the interference between a reference wave and an object wave reflected from or transmitted through a ...

SPIE2006

Living specimen tomography by digital holographic microscopy: morphometry of testate amoeba

Christian Depeursinge, Tristan Colomb, Nicolas Pavillon, Benjamin Rappaz, Pierre Marquet, Edward Mitchell, Florian Charrière, Thierry Jean Heger

This paper presents an optical diffraction tomography technique based on digital holographic microscopy. Quantitative 2-dimensional phase images are acquired for regularly-spaced angular positions of the specimen covering a total angle of π, allowing to bu ...

2006

Use of digital holographic microscopy in tomography

Christian Depeursinge, Tristan Colomb, Etienne Cuche, Frédéric Montfort, Pierre Marquet, Jonas Kühn, Florian Charrière, Mihaela Marian

Digital Holographic Microscopy (DHM) provides three-dimensional (3D) images with a high vertical accuracy in the nanometer range and a diffracted limited transverse resolution. This paper focuses on 3 different tomographic applications based on DHM. First, ...

SPIE2006

Cell refractive index tomography by digital holographic microscopy

Christian Depeursinge, Tristan Colomb, Etienne Cuche, Frédéric Montfort, Pierre Marquet, Jonas Kühn, Florian Charrière, Mihaela Marian

For what we believe to be the first time, digital holographic microscopy is applied to perform optical diffraction tomography of a pollen grain. Transmission phase images with nanometric axial accuracy are numerically reconstructed from holograms acquired ...

2006

The Distributed Karhunen-Loève Transform

Martin Vetterli, Michael Christoph Gastpar, Pier Luigi Dragotti

The Karhunen–Loève transform (KLT) is a key ele- ment of many signal processing and communication tasks. Many recent applications involve distributed signal processing, where it is not generally possible to apply the KLT to the entire signal; rather, the K ...

2006

Fast focus field calculations

Theo Lasser, Marcel Leutenegger, Rainer Leitgeb, Ramachandra Rao

We present a fast calculation of the electromagnetic field near the focus of an objective with a high numerical aperture (NA). Instead of direct integration, the vectorial Debye diffraction integral is evaluated with the fast Fourier transform for calculat ...

2006

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Théorème de Radon

Enhancement of extended depth of field by digital focusing

Hard X-ray phase tomography with low-brilliance sources

Tomographic reconstruction of three-dimensional objects from hard X-ray differential phase contrast projection images

Direct Fourier Tomographic Reconstruction Image-To-Image Filter

Biological cell (pollen grain) refractive index tomography with digital holographic microscopy

Living specimen tomography by digital holographic microscopy: morphometry of testate amoeba

Use of digital holographic microscopy in tomography

Cell refractive index tomography by digital holographic microscopy

The Distributed Karhunen-Loève Transform

Fast focus field calculations

Graph Chatbot

Chattez avec Graph Search

Hard X-ray phase tomography with low-brilliance sources

Living specimen tomography by digital holographic microscopy: morphometry of testate amoeba

Enhancement of extended depth of field by digital focusing

Tomographic reconstruction of three-dimensional objects from hard X-ray differential phase contrast projection images

The Distributed Karhunen-Loève Transform

Fast focus field calculations

Direct Fourier Tomographic Reconstruction Image-To-Image Filter

Biological cell (pollen grain) refractive index tomography with digital holographic microscopy

Use of digital holographic microscopy in tomography

Cell refractive index tomography by digital holographic microscopy