Roberto Colotti

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This paper introduces an associative information retrieval model based on the two-level architecture proposed in [Agosti et al, 1989a] and[Agostiet al, 1990], andan experimental prototype developed in order to validate the model in a personal computing environment. In the fiist part of the paper, related work and motivations are presented. In the second(More)
SUMMARY This paper addresses the problem of data modelling in information retrieval. The study introduces various aspects and issues that are necessarily taken into account when designing and developing an information retrieval system. Particular attention is paid to the representation of the different types of data managed by an information retrieval(More)
Previous studies identified the train compartment as the place where people can experience the highest exposure levels to electromagnetic fields in the radiofrequency range. Thus, in this study, a possible scenario of a train compartment has been reproduced and characterized, both numerically and experimentally, in order to assess the individual exposure. A(More)
PURPOSE 1) To implement a higher-resolution isotropic 3D T2 mapping technique that uses sequential T2 -prepared segmented gradient-recalled echo (Iso3DGRE) images for knee cartilage evaluation, and 2) to validate it both in vitro and in vivo in healthy volunteers and patients with knee osteoarthritis. MATERIALS AND METHODS The Iso3DGRE sequence with an(More)
PURPOSE To characterize and optimize 19 F MRI for different perfluorocarbons (PFCs) at 3T and quantify the loss of acquisition efficiency as a function of different temperature and cellular conditions. METHODS The T1 and T2 relaxation times of the commonly used PFCs perfluoropolyether (PFPE), perfluoro-15-crown-5-ether (PFCE), and perfluorooctyl bromide(More)
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