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.
Implementation of image reconstruction from tomographic data has been presented for the first time to external experts in tomography at two conferences. First one was XL IEEE-SPIE Joint Symposium Wilga 2017 and the second one was 2nd Jagiellonian Symposium on Fundamental and Subatomic Physics
The project received much interest from the experts from USA universities and was reviewed as having much potential in development of true innovative solutions, not existing on market so far.
Another step into tomographic image reconstruction in real time has been made!
JPET Controller allows to process data from 8 TRBv3s in several steps leading to image creation:
- Receive and synchronize data units from the TRBv3s
- Hit data extraction
- Detector geometry mapping
- Coincidence search
- LOR coordinates calculation
- Data transmission
All those steps, performed 50 000 times per second, processing hundreds MB per second reduce the data volume to hundreds of KB and limit the processing on the CPU only to drawing points. All this on a single Xilinx Zynq.
Next steps are:
- Introduction of calibration parameters
- 3rd dimension Z-Axis
Under this [link] you can find a video that shows reconstructed image being drawn in real time as the radioactive source on robotic arm scans the detector.
First images have been produced by JPET Controller board!
The controller processes data streams from 8 TRBs, parses the TDC data and recovers hits on scintillators. The hits are correlated together by scanning with a time window and then mapped into the detector geometry in order to recover LOR coordinates. Finally instead of raw TDC data only two points from LOR are being sent.
Recently two of our colleagues have defended their thesis based on research involving FPGAs.
The first one: “Particle track recognition on FPGA devices”, by Emilia Pieczonka and
The second one: “Particle track reconstruction on FPGA devices” by Kuba Cierlik
They both are from Faculty of Electrical Engineering, Automatics, Computer Science and Biomedical Engineering from University of Science and Technology.
We have just received brand new VCU108 Evaluation Boards with Xilinx Virtex Ultrascale XCVU095. Those powerful platforms will be used in the readout of silicon photomultipliers layer for JPET tomograph.
Brand new Zynq7000 All Programmable SoC ZC706 Evaluation Kit has just arrived!
It’s a powerful set for development of various projects, mainly engaging embedded processor.
Together with SDSoC it opens a new direction for exploring various mechanisms of data processing.