Image Processing

ASTRA Toolbox Tutorial: Reconstruction from Projection Images, Part 2

Figure 1. Central slice of the reconstructed object.

This is part two of a tutorial that describes how to use the ASTRA Toolbox to create a 3D reconstruction from 2D projection images that were taken with a cone-beam CT scanner. In this second part, I’ll create a reconstruction from the synthetic dataset that…

Submitted on 22 October 2018
Tomography Demo

Figure 1. Tomography demo.

As an illustration of some techniques from my series of articles on tomography, I have added a tool that demonstrates basic scanning and reconstruction. Go to the tool. There are several…

Tom Sat, 10/17/2015 - 13:19
The PDART Algorithm, Part 1

Figure 1. Phantom image (left) and SIRT reconstruction (right).

This article is a bit of an experiment. In it, I’ll try to explain PDART, an example of current algorithm research in computed tomography (PDART was published in 2011). What the algorithm does is, in a nutshell, a SIRT reconstruction with intermediate…

Tom Mon, 08/11/2014 - 09:14
Compressed Sensing

Figure 1. Compressed sensing example with stars. Original image (left), measurements (middle), reconstructed image (right).

Compressed sensing (or compressive sensing) is a relatively new technique that is becoming more and more important in image and signal acquisition. The term originates from image compression, where, in the classical workflow, images are first…

Tom Sun, 06/01/2014 - 20:19
Tomography Challenge

Challenge sinogram

Here’s a challenge for you: Reconstruct the given sinogram using the the ASTRA Tomography Toolbox that I introduced in the previous article. You’ll have to figure out the exact meaning of a sinogram like this to be able to do that. For more information…

Tom Wed, 02/26/2014 - 20:48