Introduction: Paediatric patients deserve special attention because of the higher radiation risks compared with adults. The main purpose of this study is to determine patient dose and diagnostic reference level for Paediatric through Entrance Surface Dose (ESD) calculations in common X-ray examination and to establish Paediatric national DRLs in digital radiography in Iran. <...

IDTV (Interactive Digital TV) opens new learning possibilities where new forms of education are needed. In order to achieve the participation of viewers in these experiences —overcoming their typical passivity— the combination of education and entertainment is essential. In this paper, we present a new concept in t-learning: entercation experiences, where we use TV programs as a hook to engage ...

We discuss the importance of the direct link between the most accurate radio and optical reference frames that will become possible with the next-generation space as-trometry missions in about a decade. The positions of more than 500 active galactic nuclei that are common in the precise Very Long Baseline Interferometry (VLBI) catalogues and the Sloan Digital Sky Survey (SDSS) Data Release 4 (D...

We present a phase-imaging technique to quantitatively study the three-dimensional structure of cells. The method, based on the simultaneous dual-wavelength digital holography, allows for higher axial range at which the unambiguous phase imaging can be performed. The technique is capable of nanometer axial resolution. The noise level, which increases as a result of using two wavelengths, is the...

We show that digital holography can be combined easily with optical coherence tomography approach. Varying the reference path length is the means used to acquire a series of holograms at different depths, providing after reconstruction images of slices at different depths in the specimen thanks to the short-coherence length of light source. A metallic object, covered by a 150-microm-thick onion...

High pixel count apertures for digital holography may be synthesized by scanning smaller aperture detector arrays. Characterization and compensation for registration errors in the detector array position and pitch and for phase instability between the reference and object field is a major challenge in scanned systems. We use a secondary sensor to monitor phase and image-based registration param...

The FAIRPoints organization, co-founded by the authors, aims to provide a platform for conversations take place around realistic and pragmatic implementations of FAIR (Findable, Accessible, Interoperable, Reusable) principles. uniqueness effort stems from an additional aim: capture conversation contributions in form “bite-sized” objects – “points” way that facilitates dynamic composition instru...

A computer vision technique is introduced to remove a moving foreground object in a video sequence for digital post-processing. Recently various digital special effects are employed in generating video production. This paper introduces one of the digital special effect techniques, moving object removal and background completion. To find a moving foreground object in a video sequence, we track b...

In this paper, we argue that Digital Object Memories in the Internet of Things are closely related to partial user models in Personalization and that research can gain insights by analogy from both sides. We describe UbisMemory, a Semantic Web middleware for partial user models and digital object memories. We describe the content representation , the service and its technical issues. We argue t...