Category Archives: J-PET

Modular J-PET delivers data

Sometimes in research it takes a lot of effort, time and patience to get something running. But then when it runs – the satisfaction is granted.

It has been exactly 5 years since the Data Acquisition System  for the first J-PET prototype said *beep* and provided first tomography data from the scanner constructed out of plastic scintillators.

During these 5 years, we designed, constructed and eventually successfully launched  a completely new vision of PET tomography – a lightweight, modular scanner with a compact and powerful data processing system.

24 modules have 13 plastic scintillator strips and 54 SiPMs on each end. The signals they generate are registered by Artix7 based front end boards that digitize the signals and send the data to 4 data concentrators which are Virtex Ultrascale VCU108 boards from Xilinx. The entire system is controlled by a single Zynq Ultrascale+ ZCU102 board – all interconnected and synchronized by a ton of optical links.

The concentrator boards preprocess the raw data extracting time coincidences, applying calibrations and converting it into reconstructed interaction points on the modules. Such data stream is sent to the storage using UDP and 10GbE links but additionally transferred to the controller board for to be developed real-time image reconstruction. At this moment we have the software visualization using J-PET Software Framework which delivers first insight into the data – a radioactive source placed in the center of the barrel.

It’s something! Now we design a system for a Total-Body Tomography – a scanner capable of monitoring radiopharmaceutical marker distribution over the entire human body in a single shot.

[image K.Kacprzak]

one of the first to get hololens2

Today we have received Microsoft Hololens 2 as the first batch of this sweet hardware has been shipped worldwide.

20200429_190718

FPGAFAIS and Jagiellonian University are one of the first to have this equipment available for research.

The holographic goggles are intended to be used for J-PET project and visualization of tomographic measurement in real-time on the patient but it offers so much possibilities.

The goggles run Windows 10 and can be programmed in C# using Unity game engine and Vuforia. In case you have some experience in these technologies, don’t hesitate to join our group.

If you are interested, have an idea for an interesting project, have a look at diploma projects tab or email directly at grzegorz.korcyl@uj.edu.pl

Many thanks to Bechtle AG for assisting us with the purchase.

J-PET on Total Body PET conference

Our J-PET scanner has been one of three main projects for whole-body PET imaging during Total Body PET – From Mice to Men conference.

The contribution of our FPGA-FAIS group was in a form of a poster that highlights main ideas for innovative tomographic data processing. As no other system is doing high-level analysis of this sort on the level of FPGAs we caught a lot of interest.

You can check out the poster under this link.

Wilga Symposium 2018 – DAQ in Digital J-PET and J-PET tomography project

It was a great pleasure for me to  attend Summer XLII-nd IEEE-SPIE Joint Symposium on Photonics, Web Engineering, Electronics for Astronomy and High Energy Physics Experiments presenting DAQ system of PET tomography devices developed by our team.
http://wilga.ise.pw.edu.pl/

The conference takes place in Warsaw University of Technology Wilga Village, where attendees are accommodated. Quiet and full of nature terrains aids concentration and provides space to relax and chill out after scientific activities.

Real-time visualization of J-PET in browser

It is now possible to get a real-time view at our scanner visualization in your browser (if you are inside department local network).

The most interesting thing is how the image gets there:

  1. Data from digitizers is received by the J-PET Controller FPGA
  2. Lines-Of-Response are reconstructed in real-time
  3. Regions-Of-Response are calculated into X,Y,Z annihilation coordinates
  4. Stream of reconstructed points is forwarded from programmable logic through Xillybus to the shared DDR memory
  5. Petalinux with Ubuntu running on integrated ARM cores accesses the memory and streams the points to your browser by a NodeJS server

It is a next step in the integration of image reconstruction process within the FPGA SoC device. Now, we have a framework on which we can implement further data processing in software.

We are thankful to Bartłomiej Flak and Dr Paweł Rajda from AGH Kraków for their contribution to the J-PET project.

 

Integrated PET data processing on single FPGA to be published!

We are glad to inform that our manuscript “Evaluation of single-chip, real-time tomographic data processing on FPGA SoC devices” has been accepted for publication in IEEE Transactions on Medical Imaging!

We are the first to have developed a compact and integrated solution for high-level PET processing on FPGAs.

It is a significant confirmation that out work is appreciated by the community. We have much more to come in that matter!

You can check it out here.

First 3D reconstruction

Enhanced image reconstruction, including 3D and TOF functionalities has been successfully implemented entirely in the FPGA!

In programmable logic, we are finding LOR candidates and reconstruct the annihilation point coordinates. Then, only X, Y, Z values are being sent from the JPET Controller to the server that produces 3D canvas with the scanner visualization.

You can find a video showing it in action under [this] link.