Autor: Katarzyna Życieńska
Licencja: GNU General Public License
Author: Katarzyna Życieńska
License: GNU General Public License
What’s going on?
This is a two-dimensional model of the computed tomography scanner. The idea of this program is to show how an image is created using only the information about absorbed radiation. The intensity of X-rays passing through matter is weakened. With this information we can try to reconstruct the object.
Using this program you can see, how the image is changing with information collected from different angels.
How to create an object ready for irradiation?
Firstly draw an object that you want to irradiate:
- click on squares to fill them in
- pressing the left mouse button you can fill in many squares at once
How to irradiate an object?
Pressing the left mouse button anywhere in the white background you can irradiate the object.
The reconstructed image appears on the right side of the screen when the first irradiation has been completed.
1. By pressing the red „x” button you can delete the whole reconstruction including the created object.
2. Do you want to delete just the reconstruction without removing the created object?
Click the yellow „⟲" button or double-click the same square.
3. The blue button in the right bottom corner is for changing the method of reconstruction.
It allows you to choose three methods of reconstruction:
"0" accumulation with reset
4. By pressing the white button with a graph in the left bottom corner you hide or show a graph of parameters p.
The parameter p is the sum of the product of distance and density in one square (it’s the same as the logarithm of the quotient of the intensity of X-rays at the beginning and the intensity after passing through the matter, which is an estimate in full tomography analysis).
Each following bar on the graph corresponds to the value of parameter p for the next ray.
1. The first slider with the symbol ρ in the left upper corner is for setting the density of the squares being created.
2. The second slider, with the letter "k" on it, allows you to choose the coloring of the reconstruction image.
3. The third slider blackens squares on the reconstruction lattice. Squares with relevant values (between two triangles on the slider) become black.
4. The fourth slider at the bottom increases or decreases the number of X rays that the object is irradiated with.
How to save the image?
Click the „s” button on the keyboard. Has anything gone wrong?
If buttons overlap sliders, increase the browser window and reload the site.
The height of the browser window should be more than 730 px and width morethan 1200 px.
Do you have any questions about the program or ideas to develop it?
To exit press Esc or click x in the right upper corner of the help window.