LECTURE NOTES IN MEDICAL ENGINEERING
Dual Energy & Spectral CT: Double your Gun — Double your Fun!
Spectral CT, Quantitative CT & Material Decomposition
These are the lecture notes for FAU’s YouTube Lecture “Medical Engineering”. This is a full transcript of the lecture video & matching slides. The course is supported by a corresponding Open Access Book, and Open Source Slides (zenodo/github). We hope, you enjoy this as much as the videos. Of course, this transcript was created with deep learning techniques largely automatically and only minor manual modifications were performed. Try it yourself! If you spot mistakes, please let us know!
Previous Chapter | Watch this Video | Next Chapter | Overview
Welcome back to medical engineering. Today we want to discuss a little bit about the spectral properties of X-rays and how they can be incorporated into the CT reconstruction process. So today’s topic will be spectral CT.
Let me give you a short refresher about the measurement process and the different energies improved. Then we will go ahead and talk about the properties that emerge from that like the polychromatic radiation and its effect as well as the basics of spectral CT algorithms and the different measurement concepts that are used in practice and some take-home messages.
Now let’s review the CT measurement process. So what we typically have is a CT gentry like this one. You have a tube you have this banana-shaped kind of detector here and then you have the object in the center and we are acquiring this fan beam type of image. Now we rotate in order to get the entire reconstruction done and we rotate by at least 180 degrees plus this fan angle. If you want to make sure you go towards 360 degrees then you have measured all of the relevant rays. If we do this we have this sinogram that emerges.
