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Search Results: 1 - 10 of 8991 matches for " Silvia Taralli "
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Usefulness of Whole-Body Fluorine-18-Fluorodeoxyglucose Positron Emission Tomography in Patients with Neurofibromatosis Type 1: A Systematic Review
Giorgio Treglia,Silvia Taralli,Francesco Bertagna,Marco Salsano,Barbara Muoio,Pierluigi Novellis,Maria Letizia Vita,Fabio Maggi,Alessandro Giordano
Radiology Research and Practice , 2012, DOI: 10.1155/2012/431029
Abstract: Aim. To systematically review the role of positron emission tomography (PET) with fluorine-18-fluorodeoxyglucose (FDG) in patients with neurofibromatosis type 1 (NF1). Methods. A comprehensive literature search of published studies regarding FDG-PET and PET/CT in patients with NF1 was performed. No beginning date limit and language restriction were used; the search was updated until December 2011. Only those studies or subsets in studies including whole-body FDG-PET or PET/CT scans performed in patients with NF1 were included. Results. We identified 12 studies including 352 NF1 patients. Qualitative evaluation was performed in about half of the studies and semiquantitative analysis, mainly based on different values of SUV cutoff, in the others. Most of the studies evaluated the role of FDG-PET for differentiating benign from malignant peripheral nerve sheath tumors (MPNSTs). Malignant lesions were detected with a sensitivity ranging between 100% and 89%, but with lower specificity, ranging between 100% and 72%. Moreover, FDG-PET seems to be an important imaging modality for predicting the progression to MPNST and the outcome in patients with MPNST. Two studies evaluated the role of FDG-PET in pediatric patients with NF1. Conclusions. FDG-PET and PET/CT are useful methods to identify malignant change in neurogenic tumors in NF1 and to discriminate malignant from benign neurogenic lesions. 1. Introduction Neurofibromatosis type 1 (NF1) is an autosomal dominant disease with an incidence of 1 in 2,500 to 1 in 3,000 subjects. Neurofibroma, a benign peripheral nerve sheath tumor, is the most common tumor in NF1 patients and may manifest as focal nodular, cutaneous or subcutaneous lesion, intraforaminal spinal nerve root tumor, or plexiform neurofibroma (PNF). Patients with NF1 have an increased risk of developing malignant peripheral nerve sheath tumors (MPNSTs) with a life-time risk of 8–12% [1–6]. MPNSTs usually arise from preexisting benign PNF, metastasize widely, and frequently have a poor prognosis. Therefore, differentiating between benign and malignant tumors in patients with NF1 has important prognostic and therapeutic implications, but can be difficult, especially in individuals who have multiple benign tumors. Optimal management is dependent on early and accurate histological grading and staging of the disease, but MPNSTs are often difficult to detect and may metastasize to many different sites. Pain, rapid increase in size of a neurofibroma, and the development of neurological deficit are clinical indicators of malignancy, but may also be features
18?F-fluoro-deoxy-glucose focal uptake in very small pulmonary nodules: fact or artifact? Case reports
Maria Lucia Calcagni, Silvia Taralli, Fabio Maggi, Vittoria Rufini, Giorgio Treglia, Lucia Leccisotti, Lorenzo Bonomo, Alessandro Giordano
World Journal of Surgical Oncology , 2012, DOI: 10.1186/1477-7819-10-71
Abstract: We report five cases of oncologic patients showing focal lung 18?F-FDG uptake on PET-CT in nodules smaller than 1?cm. We also discuss the most common causes of 18?F-FDG false-positive and false-negative results in the pulmonary parenchyma.In patient 1, contrast-enhanced CT performed 10?days before PET-CT did not show any abnormality in the site of uptake; in patient 2, high-resolution CT performed 1?month after PET showed a bronchiole filled with dense material interpreted as a mucoid impaction; in patient 3, contrast-enhanced CT performed 15?days before PET-CT did not identify any nodules; in patients 4 and 5, contrast-enhanced CT revealed a nodule smaller than 1?cm which could not be characterized. The 18?F-FDG uptake at follow-up confirmed the malignant nature of pulmonary nodules smaller than 1?cm which were undetectable, misinterpreted, not recognized or undetermined at contrast-enhanced CT.In all five oncologic patients, 18?F-FDG was able to metabolically characterize as malignant those nodules smaller than 1?cm, underlining that: 18?F-FDG uptake is not only a function of tumor size but it is strongly related to the tumor biology; functional alterations may precede morphologic abnormalities. In the oncologic population, especially in higher-risk patients, PET can be performed even when the nodules are smaller than 1?cm, because it might give an earlier characterization and, sometimes, could guide in the identification of alterations missed on CT.
High intrinsic energy resolution photon number resolving detectors
L. Lolli,E. Taralli,C. Portesi,E. Monticone,M. Rajteri
Physics , 2013,
Abstract: Transition Edge Sensors (TESs) are characterized by the intrinsic figure of merit to resolve both the energy and the statistical distribution of the incident photons. These properties lead TES devices to become the best single photon detector for quantum technology experiments. For a TES based on titanium and gold has been reached, at telecommunication wavelength, an unprecedented intrinsic energy resolution (0.113 eV). The uncertainties analysis of both energy resolution and photon state assignment has been discussed. The thermal properties of the superconductive device have been studied by fitting the bias curve to evaluate theoretical limit of the energy resolution.
Self consistent, absolute calibration technique for photon number resolving detectors
A. Avella,G. Brida,I. P. Degiovanni,M. Genovese,M. Gramegna,L. Lolli,E. Monticone,C. Portesi,M. Rajteri,M. L. Rastello,E. Taralli,P. Traina,M. White
Physics , 2011, DOI: 10.1364/OE.19.023249
Abstract: Well characterized photon number resolving detectors are a requirement for many applications ranging from quantum information and quantum metrology to the foundations of quantum mechanics. This prompts the necessity for reliable calibration techniques at the single photon level. In this paper we propose an innovative absolute calibration technique for photon number resolving detectors, using a pulsed heralded photon source based on parametric down conversion. The technique, being absolute, does not require reference standards and is independent upon the performances of the heralding detector. The method provides the results of quantum efficiency for the heralded detector as a function of detected photon numbers. Furthermore, we prove its validity by performing the calibration of a Transition Edge Sensor based detector, a real photon number resolving detector that has recently demonstrated its effectiveness in various quantum information protocols.
Quantum characterization of superconducting photon counters
Giorgio Brida,Luigi Ciavarella,Ivo P. Degiovanni,Marco Genovese,Lapo Lolli,Maria G. Mingolla,Fabrizio Piacentini,Mauro Rajteri,Emanuele Taralli,Matteo G. A. Paris
Physics , 2011, DOI: 10.1088/1367-2630/14/8/085001
Abstract: We address the quantum characterization of photon counters based on transition-edge sensors (TESs) and present the first experimental tomography of the positive operator-valued measure (POVM) of a TES. We provide the reliable tomographic reconstruction of the POVM elements up to 11 detected photons and M=100 incoming photons, demonstrating that it is a linear detector.
The Challenge of UNASUR Member Countries to Replace ICSID Arbitration  [PDF]
Silvia Karina Fiezzoni
Beijing Law Review (BLR) , 2011, DOI: 10.4236/blr.2011.23014
Abstract: In the 2000s, the financial crisis in Argentina and several nationalizations carried out by governments in South America have spawned a large number of claims before International Centre for Settlement of Investment Disputes (ICSID). Latin Americans began to look at ICSID critically, there have been complaints about ICSID's connections with the World Bank; non-commercial interests, such as health or environmental protection, have not received adequate attention in the arbitration cases; a lack of transparency by arbitration panels; and the absence of an appeals process, but only a limited annulment procedure. This situation generates impacts upon the overall due process of ICSID arbitrations and Latin American hostility against ICSID, such the Bolivarian Alliance for the Peoples of our America Peoples'Trade Treaty (ALBA-TCP) Declaration to denounce ICSID Convention and the firm intention of Union of South American Nations (UNASUR) countries to create a regional arbitration centre to replace ICSID arbitration.
On the Relativistic Stars  [PDF]
Silvia Morales, Roberto Aquilano
Journal of Modern Physics (JMP) , 2012, DOI: 10.4236/jmp.2012.34046
Abstract:

? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ??Announcement from Editorial Board

The following article has been retracted due to plagiarism. This paper published in Vol.3 No.4, April 2012, has been removed from this site.


Title: On the Relativistic Stars

Author: Silvia Morales, Roberto Aquilano


It has been brought to our attention that this paper appears exactly as it was published in Astroparticle Physics, vol. 32, 2009, 153. (\"On the nature of relativistic stars\" by Silvia Morales, Alejandra Zorzi, Roberto Aquilano)

Consequently, this paper has been retracted by Journal of Modern Physics.

? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ?JMP Editorial Board

? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ?April 30, 2015

Use of Alternative and Complementary Medicine by Old Italians Adults: The Determinant of Choice  [PDF]
Silvia Platania, Giuseppe Santisi
Open Journal of Social Sciences (JSS) , 2015, DOI: 10.4236/jss.2015.37042
Abstract: Complementary and alternative medicine (CAM) is the term for medical products and practices that aren’t part of standard care. Although using complementary and alternative medicines (CAM) is becoming increasingly prevalent in Italy, research in complementary and alternative therapy in older adults is limited. This study investigates the predictors and the determinant of choice of using complementary and alternative medicine (CAM) in older adult consumers [1]-[3]. The sample consisted of 150 Italian older consumers who used alternative medicine in the last year. The older adults interviewed were 52 males (34.7%) and 98 females (65.3%) and the average age was 65.4 (SD = 0.76). The results of this study showed a strong dissatisfaction of respondents with the tra-ditional medical treatments because the alternative’s medicine treatments are considered more invasive.
Phonons near Peierls Structural Transition in Quasi-One-Dimensional Organic Crystals of TTF-TCNQ  [PDF]
Silvia Andronic, Anatolie Casian
Advances in Materials Physics and Chemistry (AMPC) , 2016, DOI: 10.4236/ampc.2016.64010
Abstract: The Peierls structural transition in quasi-one-dimensional organic crystals of TTF-TCNQ is investigated in the frame of a more complete physical model. The two most important electron-phonon interaction mechanisms are taken into account simultaneously. One is similar of that of deformation potential and the other is of polaron type. For simplicity, the 2D crystal model is considered. The renormalized phonon spectrum and the phonon polarization operator are calculated in the random phase approximation for different temperatures. The effects of interchain interaction on renormalized acoustic phonons and on the Peierls critical temperature are analyzed.
Metal-Insulator Transition of Peierls Type in Quasi-One-Dimensional Crystals of TTT2I3  [PDF]
Silvia Andronic, Anatolie Casian
Advances in Materials Physics and Chemistry (AMPC) , 2017, DOI: 10.4236/ampc.2017.75017
Abstract: We investigate the metal-insulator transition in quasi-one-dimensional organic crystals of tetrathiotetracene-iodide, TTT2I3, in the 2D model. A crystal physical model is applied which takes into account two the most important hole-phonon interaction mechanisms. One is similar to that of deformation potential and the other is of polaron type. The scattering on defects is also considered and it is crucial for the explanation of the transition. The phonon polarization operator and the renormalized phonon spectrum are calculated in the random phase approximation for different temperatures applying the method of Green functions. We show that the transition is of Peierls type. The effect of lattice distortion on the dispersion of renormalized acoustic phonons is analyzed.
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