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Microtomography

last modified 13-05-2008 09:54

1 - Principle of the Technique

Microtomography is an imaging technique based on radiography. It is the same principle as the medical scanner, but using synchrotron radiation allows to reach much higher resolution.

2 - Principle of the reconstruction algorithm

Synchrotron radiation leads to a parallel beam geometry.

From the acquisition of about 1500 radiographs, volume is obtained using filtered backprojection algorithm.

Demonstration
See the following page: http://bigwww.epfl.ch/demo/jtomography/

3 - Acquisition

3.1 - Basis to perform a microtomography experiment at ID19

Step by step experiment document

3.2 - First reconstructed slice during experiment

Computing during experiment

4 - Database: tomoDB

All scans performed on ID19 are registered in a Database (First version created by Ludovic Launer in 1999). This Database contains a lot of information about acquisition like energy, exposure_time, distance between sample and detector, image of a projection, image of a slice, ...

The first version of tomoDB was improved by Véronique Chaffard and Hyacinthe Meniet in July 2004.

Access to this database is possible onsite only.

User name: guest password: tomodb

The user manual of tomoDB is available here (in French).

5 - Reconstruction

Using cronus1 machine as parent: see here

We use pyHST (High Speed Tomography in python version) software as reconstruction program. It has been created by Andy Hammersley and optimised by Alessandro Mirone.
A complete documentation about this software is available at this web page.