A commercially available amorphous Silicon Electronic Portal imaging device (aSi-EPID) installed onto Siemens Oncor Linear accelerator was evaluated with the objective to be implemented for IMRT quality assurance. EPID properties were investigated; these include reproducibility, dependences between the relative EPID responses and field size, dose rate were studied for both photon beams. To dete...

An amorphous silicon EPID has been investigated to determine whether it is capable of quality control constancy measurements for linear accelerator electron beams. The EPID grayscale response was found to be extremely linear with dose over a wide dose range and, more specifically, for exposures of 95-100 MU. Small discrepancies of up to 0.8% in linearity were found at 6 MeV (8-15 MeV showed bet...

The calcium-sensing receptor (CaR) has an essential role in mediating Ca(2+)-induced keratinocyte differentiation in vitro. In this study, we generated keratinocyte-specific CaR knockout ((Epid)CaR(-/-)) mice to investigate the function of the CaR in epidermal development in vivo. (Epid)CaR(-/-) mice exhibited a delay in permeability barrier formation during embryonic development. Ion capture c...

Enhanced Privacy ID (EPID) is a cryptographic scheme that enables the remote authentication of a hardware device while preserving the privacy of the device. EPID can be seen as a direct anonymous attestation scheme with enhanced revocation capabilities. In EPID, a device can be revoked if the private key embedded in the hardware device has been extracted and published widely so that the revocat...

BACKGROUND In radiotherapy treatments, it is crucial to monitor the performance of linac components including gantry, collimation system, and electronic portal imaging device (EPID) during arc deliveries. In this study, a simple EPID-based measurement method is suggested in conjunction with an algorithm to investigate the stability of these systems at various gantry angles with the aim of evalu...

A National Project for the in-vivo dosimetry in radiotherapy: first results A.Piermattei 1 , L. Azario 1 , S. Cilla 2 , A.Fidanzio 1 , F.Greco 1 , M.T.Russo 3 , S. Zucca 4 1 Istituto di Fisica e Unità Operativa di Fisica Sanitaria, Università Cattolica del S. Cuore, Roma 2 Unità Operativa di Fisica Sanitaria, Fondazione per la Ricerca e Cura ‘Giovanni Paolo II’, Campobasso 3 Unità Operative di ...

THE SEVEN books of Epidemics ("Epidemiae": visits to cities) which come to us in the Hippocratic Corpus fall into three groups, Epid. I and 3, Epid. 2, 4, and 6, and Epid. 5 and 7. Like the other works of the Corpus, their authorship, provenance, and dates are in doubt.' Traditionally since Galen's time Epid. I and 3 have been admired as Hippocrates' work or as the work of a "Coan" school conne...

This study focused on predicting the electronic portal imaging device (EPID) image of intensity modulated radiation treatment (IMRT) fields in the absence of attenuation material in the beam with Monte Carlo methods. As IMRT treatments consist of a series of segments of various sizes that are not always delivered on the central axis, large spectral variations may be observed between the segment...