Optimisation of the event-based TOF filtered back-projection for online imaging in total-body J-PET
| Autor: | Beatrix C. Hiesmayr, Lech Raczyński, Shivani, R. Y. Shopa, F. Tayefi, Kamil Dulski, N. Chug, Paweł Moskal, Aleksander Gajos, E.Ł. Stȩpień, Sushil K. Sharma, Eryk Czerwiński, P. Kopka, K. Kacprzak, Łukasz Kapłon, Catalina Curceanu, Paweł Kowalski, Wojciech Wiślicki, Grzegorz Korcyl, J. Raj, Wojciech Krzemien, Sz. Niedźwiecki, Ewelina Kubicz, Konrad Klimaszewski, D. Kisielewska, M. Dadgar, N. Krawczyk |
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| Rok vydání: | 2021 |
| Předmět: |
Physics - Instrumentation and Detectors
Mean squared error Computer science Image quality FOS: Physical sciences Health Informatics Imaging phantom 030218 nuclear medicine & medical imaging 03 medical and health sciences 0302 clinical medicine Image Processing Computer-Assisted Humans Computer vision Radiology Nuclear Medicine and imaging Image resolution Radon transform Radiological and Ultrasound Technology business.industry Phantoms Imaging Reconstruction algorithm Instrumentation and Detectors (physics.ins-det) Computational Physics (physics.comp-ph) Physics - Medical Physics Computer Graphics and Computer-Aided Design Kernel (image processing) 030220 oncology & carcinogenesis Temporal resolution Positron-Emission Tomography Artificial intelligence Computer Vision and Pattern Recognition Medical Physics (physics.med-ph) business Physics - Computational Physics Monte Carlo Method Algorithms |
| DOI: | 10.48550/arxiv.2107.12750 |
| Popis: | We perform a parametric study of the newly developed time-of-flight (TOF) image reconstruction algorithm, proposed for the real-time imaging in total-body Jagiellonian PET (J-PET) scanners. The asymmetric 3D filtering kernel is applied at each most likely position of electron-positron annihilation, estimated from the emissions of back-to-back $\gamma$-photons. The optimisation of its parameters is studied using Monte Carlo simulations of a 1-mm spherical source, NEMA IEC and XCAT phantoms inside the ideal J-PET scanner. The combination of high-pass filters which included the TOF filtered back-projection (FBP), resulted in spatial resolution, 1.5 $\times$ higher in the axial direction than for the conventional 3D FBP. For realistic $10$-minute scans of NEMA IEC and XCAT, which require a trade-off between the noise and spatial resolution, the need for Gaussian TOF kernel components, coupled with median post-filtering, is demonstrated. The best sets of 3D filter parameters were obtained by the Nelder-Mead minimisation of the mean squared error between the resulting and reference images. The approach allows training the reconstruction algorithm for custom scans, using the IEC phantom, when the temporal resolution is below 50 ps. The image quality parameters, estimated for the best outcomes, were systematically better than for the non-TOF FBP. |
| Databáze: | OpenAIRE |
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