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538 results on '"Fotopoulos, Andreas"'

11. Assessment of adrenal response in patients with stable cirrhosis and ascites using different short Synacthen tests and definitions

Author

Kalambokis, Georgios N., Tsiakas, Ilias, Christaki, Maria, Despotis, Grigorios, Fillipas-Ntekuan, Sempastian, Xourgia, Xanthi, Fotopoulos, Andreas, Bargiota, Alexandra, Stilopoulou, Sophia, Tigas, Stelios, Bairaktari, Eleni, Kolios, George, Koustousi, Christina, Aggelis, Nikolaos, Sergianiti, Fotini, and Milionis, Haralampos

Published
2021
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12. Nuclear Medicine and Cancer Theragnostics: Basic Concepts

Author

Zoi, Vasiliki, primary, Giannakopoulou, Maria, additional, Alexiou, George A., additional, Bouziotis, Pinelopi, additional, Thalasselis, Savvas, additional, Tzakos, Andreas G., additional, Fotopoulos, Andreas, additional, Papadopoulos, Athanassios N., additional, Kyritsis, Athanassios P., additional, and Sioka, Chrissa, additional

Published
2023
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13. Nuclear Medicine and Cancer Theragnostics

Author

Zoi, Vasiliki, primary, Giannakopoulou, Maria, additional, Alexiou, George A, additional, Bouziotis, Pinelopi, additional, Thalasselis, Savvas, additional, Tzakos, Andreas G, additional, Fotopoulos, Andreas, additional, Kyritsis, Athanassios P, additional, and Sioka, Chrissa, additional

Published
2023
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15. Conversion of Propranolol to Carvedilol Improves Renal Perfusion and Outcome in Patients With Cirrhosis and Ascites

Author

Kalambokis, Georgios N., Christaki, Maria, Tsiakas, Ilias, Despotis, Grigorios, Fillipas-Ntekouan, Sempastien, Fotopoulos, Andreas, Tsiouris, Spyridon, Xourgia, Xanthi, Lakkas, Lampros, Pappas, Konstantinos, Michalis, Lampros K., Sergianiti, Fotini, Baltayiannis, Gerasimos, Christodoulou, Dimitrios, Koustousi, Christina, Aggelis, Nikolaos, and Milionis, Haralampos

Published
2020
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17. The Role of Myocardial Perfusion Imaging in the Prediction of Major Adverse Cardiovascular Events at 1 Year Follow-Up: A Single Center’s Experience

Author

Zotou, Paraskevi, primary, Bechlioulis, Aris, additional, Tsiouris, Spyridon, additional, Naka, Katerina K., additional, Xourgia, Xanthi, additional, Pappas, Konstantinos, additional, Lakkas, Lampros, additional, Rammos, Aidonis, additional, Kalef-Ezra, John, additional, Michalis, Lampros K., additional, and Fotopoulos, Andreas, additional

Published
2023
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25. Myocardial perfusion imaging single photon emission computed tomography may detect silent myocardial ischemia in patient with epilepsy

Author

Markoula, Sofia, primary, Tsoumani, Afroditi, additional, Votti, Chainti Antonella, additional, Beltsiou, Maria, additional, Lakkas, Lampros, additional, Pappas, Konstantinos, additional, Iakovou, Ioannis, additional, Fotopoulos, Andreas, additional, Kyritsis, Athanassios P, additional, and Sioka, Chrissa, additional

Published
2022
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33. Growth and function in childhood of a normal solitary kidney from birth or from early infancy

Author

Siomou, Ekaterini, Giapros, Vasileios, Papadopoulou, Frederica, Pavlou, Maria, Fotopoulos, Andreas, and Siamopoulou, Antigoni

Subjects
Renal agenesis -- Research, Glomerular filtration rate -- Demographic aspects -- Research, Albuminuria -- Risk factors -- Research, Kidney diseases -- Diagnosis -- Demographic aspects -- Research, Health
Abstract

Background Children with a solitary kidney (SK) have an increased long-term risk of hypertension, albuminuria and glomerulosclerosis. In this study, we assessed the early signs of impaired glomerular filtration in children with a SK from birth or from early infancy. Methods Renal growth and function at ages 4-15.5 years were studied in 38 children with SK and 40 matched control subjects in terms of accelerated growth. Results The systolic/diastolic blood pressure Z-scores (p = 0.01/< 0.05) and the resistance index (RI) of the arcuate arteries (p = 0.05) were higher in the children with SK. Creatinine clearance and 24-h protein and albumin urinary excretion showed no difference. All but seven children with SK had 99mTc diethylene-triamine pentaacetic acid glomerular filtration rate values of > 80 ml/min/1.73 [m.sup.2]. An independent positive correlation was found between length of the follow-up time and 24-h albumin urinary excretion (β = 0.54, p < 0.01). Accelerated postnatal growth was positively related with kidney volume (β = 0.35, p < 0.05). Conclusions Among our patient cohort, renal function was well preserved at ages 4-15.5 years in children who were born with a SK. However, both their higher blood pressure and RI and the correlation of 24-h albumin urinary excretion with length of follow-up time underline the need for monitoring to detect early signs of glomerular hyperfiltration and, if necessary, implement timely intervention. SK hypertrophy was found to be correlated with postnatal growth. Keywords Solitary kidney * Unilateral renal agenesis * Uninephrectomy * Glomerulosclerosis * Resistance index * Microalbuminuria, Introduction An apparently normal solitary kidney (SK), resulting from unilateral renal agenesis, unilateral non-functioning kidney or uninephrectomy, is typically associated with increased renal growth in childhood [1-6]. The increased growth [...]

Published
2014
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35. Motion-Compensated PET Image Reconstruction via Separable Parabolic Surrogates.

Author

Protonotarios, Nicholas E., Kastis, George A., Fotopoulos, Andreas D., Tzakos, Andreas G., Vlachos, Dimitrios, and Dikaios, Nikolaos

Subjects
IMAGE reconstruction, LIMIT cycles, POSITRON emission tomography
Abstract

The effective resolution of positron emission tomography (PET) can be significantly degraded by patient motion during data acquisition. This is especially true in the thorax due to respiratory motion. This study concentrates on the improvement of motion correction algorithms both in terms of image quality and computational cost. In this paper, we present a novel motion-compensated image reconstruction (MCIR) algorithm based on a parabolic surrogate likelihood function instead of the loglikelihood function of the expectation maximization (EM) algorithm. The theoretical advantage of the parabolic surrogate algorithm lies within the fact that its loglikelihood is upper bounded by the EM loglikelihood, thus it will converge faster than EM. This is of particular importance in PET motion correction, where reconstructions are very computationally demanding. Relaxation parameters were also introduced to converge closer to the maximum likelihood (ML) solution and achieve lower noise levels. Image reconstructions with embedded relaxation parameters actually converged to better solutions than the corresponding ones without relaxation. Motion-compensated parabolic surrogates were indeed shown to accelerate convergence compared to EM, without reaching a limit cycle. Nonetheless, with the incorporation of ordered subsets in the reconstruction setting, the improvement was less evident. [ABSTRACT FROM AUTHOR]

Published
2023
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