The Phantom of Radon

A story of analytical sinograms

Francesca Tedeschi

Education Image Processing Open-Source Science Teaching

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This project contains an open source Python library for image reconstruction in Axial Computed Tomography (TAC), based on the analytical Radon transforms of some classes of phantoms.
The package is available on GitHub at the following address:
The mathematical phantoms are fictitious images, composed of very simple geometric figures (ellipses, squares and rectangles) that, sampled with the Radon transform allows to build a fictitious signal, called (exact) sinogram. Using a phantom gives the advantage to test the reconstruction algorithm on a zero-noise data so the error we get is only due to numerical inaccuracies in the algorithm itself. We want to calculate two reconstructed images from the approximated and exact sinograms, obtained applying the iradon function of the Python library scikit-image on both of them. We expect a smaller error on the exact reconstructed image. This turns to be true on continuous regions, but near the discontinuities of the phantom the Gibbs phenomenon prevents us to obtain the same enhancement.

Type: Poster session (45 mins); Python level: Beginner; Domain level: Beginner

Francesca Tedeschi

University of Padova

I am Francesca, twenty-six years old, italian.

Master Degree in Mathematical Sciences at the Catholic University of Brescia, Italy, in 2017.

Now, PhD student since October 2018 at the University of Padova, Italy, in Computational Fluid Dynamics.

This is a side project made with some colleagues and a Researcher of my University.