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  • Protonotarios NE, Kastis GA, Fotopoulos AD, Tzakos AG, Vlachos D, Dikaios, N. Motion-compensated PET image reconstruction via separable parabolic surrogates. Mathematics. 2023 11(1): 55. doi: 10.3390/math11010055.

  • Protonotarios NE, Fokas AS, Kastis GA, Dikaios N. Sigmoid and beyond: Algebraic activation functions for artificial neural networks based on solutions of a Riccati equation. IEEE IT Prof. 2022, 24(5): 30-36. doi: 10.1109/MITP.2022.3204904.

  • Protonotarios NE, Fokas AS, Vrachliotis A., Marinakis V., Dikaios N., Kastis GA. Reconstruction of preclinical PET images via Chebyshev polynomial approximation of the sinogram. Appl. Sci. 2022, 12(7): 3335. doi: 10.3390/app12073335.

  • Protonotarios NE, Katsamenis I, Sykiotis I, Dikaios N, Kastis GA, Chatziioannou SN, Metaxas M, Doulamis N, Doulamis A. A few-shot U-Net deep learning model for lung cancer lesion segmentation via PET/CT imaging. Biomed. Phys. Eng. Express. 2022; 8(2): 025019. doi: 10.1088/2057-1976/ac53bd.

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  • Vrachliotis A, Kastis GA, Protonotarios NE, Fokas AS, Nekolla SG, Anagnostopoulos CD, Costaridou L., Gaitanis A. Evaluation of the spline reconstruction technique for preclinical PET imaging. Comput. Methods Programs Biomed. 2022; 217: 106668. doi: 10.1016/j.cmpb.2022.106668.


  • Protonotarios NE, Tzampazidou E, Kastis GA, Dikaios N. Discrete shearlets as a sparsifying transform in low-rank plus sparse decomposition for undersampled (k,t)-space MR data. J. Imaging. 2022; 8(2): 29. doi: 10.3390/jimaging8020029.


  • Dikaios N, Protonotarios NE, Fokas AS, Kastis GA. Quantification of T1, T2 relaxation times from Magnetic Resonance Finger-printing radially undersampled data using analytical transformations. Magn. Reson. Imaging. 2021; 80: 81–89. doi: 10.1016/j.mri.2021.04.013.


  • Protonotarios NE, Kastis GA, Dikaios N, Fokas AS. Piecewise Polynomial Inversion of the Radon Transform in Three Space Dimensions via Plane Integration and Applications in Positron Emission Tomography. Nonlinear Analysis, Differential Equations, and Applications. Springer Optimization and Its Applications, 2021; 173: 381-396. Springer, Cham. doi: 10.1007/978-3-030-72563-1_17.


  • Protonotarios NE, Charalambopoulos A, Kastis GA, Kacperski K, Fokas AS, A spline approach to parallel-hole collimator deblurring for aSRT-reconstructed SPECT images. IEEE 19th International Conference on Bioinformatics and Bioengineering (BIBE), 2019; 326–333. doi: 10.1109/BIBE.2019.00065.


  • Protonotarios NE, Kastis GA, Fokas AS. A new approach for the inversion of the attenuated Radon transform. Mathematical Analysis and Applications. Springer Optimization and Its Applications, 2019; 154: 433–457. Springer. doi: 10.1007/978-3-030-31339-5_16.


  • Protonotarios NE, Fokas AS, Kostarelos K, Kastis GA. The attenuated spline reconstruction technique for single photon emission computed tomography. J. R. Soc. Interface. 2018; 15(148): 20180509. doi: 10.1098/rsif.2018.0509.


  • Protonotarios NE, Fokas AS, Gaitanis A, Kastis GA. aSRT: A new analytic reconstruction algorithm for SPECT. IEEE Nuclear Science Symposium, Medical Imaging Conference and Room-Temperature Semiconductor Detector Workshop (NSS/MIC/RTSD), 2016; 1–6. doi: 10.1109/NSSMIC.2016.8069451.


  • Protonotarios NE, Spyrou GM, Kastis GA. Automatic cumulative sums contour detection of FBP-reconstructed multi-object nuclear medicine images. Comput. Biol. Med. 2017; 85: 43–52. doi: 10.1016/j.compbiomed.2017.04.010.


  • Protonotarios NE, Spyrou GM, Kastis GA. Cumulative sums for edge determination of a single object in PET and SPECT images. 5th International Conference on Mathematical Modeling in Physical Sciences (IC-M2), 2016, J. Phys.: Conf. Ser.; 738(15): 012010. doi: 10.1088/1742-6596/738/1/012010.

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