I delivered a section plenary talk in the 94th GAMM Annual Meeting in Magdeburg on March 19, 2024. The title of my talk was Virtual X-rays: parallel-beam tomography hidden within electric probing, and it belonged to the Section S21 Mathematical signal and image processing, organized by Anne Wald and Johannes Maly. You can download my
This video illustrates “ill-posedness”, the nemesis of all inverse problems. We see how in a very simple 12×12 pixel tomography problem “almost-ghosts” can produce very different targets with almost the same X-ray data.
I started a new video series in my all-English YouTube channel called “Professor Sam”. Today’s upload is Tomography 201: tomography by pixels, which introduces the need for iterative variational regularization in tomographic image reconstruction with sparsely collected data. This 200-series of videos is a continuation of the 100-series explaining the basics of tomography.
I had the pleasure to visit the Institute of Mathematics for Industry (IMI) in the city Fukuoka located in the Kyushu island of Japan. The visit took place on January 9, 2024. My curiosity about IMI had been high for a while since I am a Professor of Industrial Mathematics at the University of Helsinki.
The Applied Tumor Genomics Research Program of University of Helsinki held a seminar day on October 6, 2023. They asked me to deliver a presentation about artificial intelligence and neural networks. It was my great pleasure to do so! The first part of my talk was about ChatGPT and generative text AI. I followed the
The AIP conference is the main scientific event in the field of inverse problems. It is held every two years, apart from a break during the Covid19 pandemic. Actually I have organized one myself, in 2015 in Helsinki. This year the conference was held in Göttingen, Germany, a classic scientific hub before the second world
The International Congress on Industrial and Applied Mathematics (ICIAM) was held in Tokyo in late August 2023. I participated it together with many students and colleagues from University of Helsinki. This congress happens every 4 years, and it is the main scientific conference in my field of research. It was nice for me to go
I had the honor of opening the legendary IWOTA conference at University of Helsinki on July 31, 2023. You can read my opening address below, including a JOKE! I gave my own talk as well in the minisymposium on inverse problems, organized by Lauri Oksanen and Tony Liimatainen. Here are my slides (PDF 16MB) in
I just published a new video in my lecture series on X-ray tomography (link). There I show how to use Matlab to simulate basic tomographic things such as sinograms and filtered back-projection algorithms. I also give an introductory discussion of measurement noise and how to supress it with a low-pass filter. This is how it
I was lucky to be invited again to the legendary Mathematisches Forschungsinstitut Oberwolfach (MFO). This time the topic of the five-day workshop was tomography, or mathematical slice imaging. How delightful it was to meet collaborators and share ideas after the pandemic years of online meetings!
