Abstract
Positron Emission Tomography (PET) images are considerably degraded by respiratory and involuntary motions of the patient inside the scanner, having a direct effect in a misdiagnosis. In this paper, a dedicated PET scanner with an open geometry is proposed. This PET configuration poses several challenges to image reconstruction, such as limited angles, motion correction and the sensitivity correction problem. The paper presents a GATE simulation study of image motion correction using XCAT phantom using a multi-frame algorithm called Enhance Multiple Acquisition Frames (EMAF) to correct rigid body and respiratory motion with list-mode data using time of flight (TOF) information and patient motion. This approach is implemented in three phases: frames cutting, image reconstruction and finally image registration. Additionally, the information provided by the TOF is used to improve the reconstruction due to the lack of angular information provided by the proposed open geometry system. Two performance tests are applied to validate the results, obtaining a remarkable resolution improvement after being processed. The peak signal noise ratio (PSNR) values for the corrected and uncorrected images are, respectively, 30 versus 28 dB, and for the image matching precision (IMP), 89% versus 78%. The obtained results show that the method improves the signal intensity over the background in comparison with other literature methods, maximizing the similarity between the ground-truth (static) image and the corrected image and minimizing the intra-frame motion.
Supported by the Spanish Government Grants TEC2016-79884-C2, PID2019-107790RB-C22, and PEJ2018-002230-A-AR; the Generalitat Valenciana GJIDI/2018/A/040l and the PTA2019-017113-1/AEI/10.13039/501100011033; the European Union through the European Regional Development Fund (ERDF); and the European Research Council (ERC) under the European Union’s Horizon 2020 research and innovation program (Grant Agreement No. 695536).
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Acknowledgments
This research has been supported by the Spanish Government Grants TEC2016-79884-C2, PID2019-107790RB-C22, and PEJ2018-002230-A-AR; the Generalitat Valenciana GJIDI/2018/A/040l and the PTA2019-017113-1/AEI/10.13039/501100011033; the European Union through the European Regional Development Fund (ERDF); and the European Research Council (ERC) under the European Union’s Horizon 2020 research and innovation program (Grant Agreement No. 695536).
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Conceptualization: H.E-M. and M.J.R-Á.; methodology: H.E-M.; software: H.E-M., M.V., and D.C-P.; validation: H.E-M. and D.C-P.; formal analysis: H.E-M., D.C-P., and M.V.; investigation, H.E-M., D.C-P., M.V., and Á.H-M.; resources: H.E-M.; data curation, H.E-M., M.V., and D.C-P.; framing: D.C-P.; reconstruction: M.V.; registration: Á.H-M. and H.E-M.; writing—original draft preparation: H.E-M.; writing—review and editing: D.C-P., M.V., Á.H-M., and M.J.R-Á.; visualization: D.C-P. and H.E-M.; supervision: M.J.R-Á.; project administration: M.J.R-Á.; funding acquisition: M.J.R-Á.; J.M.B.B. All authors have read and agreed to the published version of the manuscript.
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Espinós-Morató, H., Cascales-Picó, D., Vergara, M., Rodríguez-Álvarez, M.J. (2021). Image Motion Correction of GATE Simulation in Dedicated PET Scanner with Open Geometry. In: Rojas, I., Castillo-Secilla, D., Herrera, L.J., Pomares, H. (eds) Bioengineering and Biomedical Signal and Image Processing. BIOMESIP 2021. Lecture Notes in Computer Science(), vol 12940. Springer, Cham. https://doi.org/10.1007/978-3-030-88163-4_1
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