BACKGROUND Recent work by Saito (2012) has demonstrated a simple conversion from energy-subtracted computed tomography (CT) values (ΔHU) obtained using dual-energy CT to relative electron density (RED) via a single linear relationship. The purpose of this study was to investigate the feasibility of this method to obtain RED from virtual monochromatic CT images obtained by the gemstone spectral ...

Blue colored topaz is the most commercialized gemstone worldwide at present. Very rare in nature, most of these topazes are treated by laboratory irradiation with gamma ray, neutron or electron, or in combination with them ever since more than 30 years ago. Knowledge about the origin of the blue color in topazes is not well understood, and a method to identify blue topaz nondestructively is a w...

Actualmente la utilización de SGBDOOs o sistemas de persistencia carecen de flexibilidad por la necesidad de incluir código adicional al propio de la aplicación y por la necesidad de amoldarse a las distintas APIs y versiones existentes. En este artículo se plantean las posibilidades de un sistema integral orientado a objetos, basado en una máquina abstracta dotada de reflectividad. Gracias a é...

A semantic domain based on state-machines is proposed for object-orientation in order to clarify the most important constructions: aggregation, in-terconnection and specialization. Three kinds of specialization are discussed: sub-typing (specialization without side-effects and no non-monotonic overriding); monotonic specialization (possibly with side-effects but still with monotonic overriding ...

PURPOSE To prospectively investigate the effect of using Gemstone Spectral Imaging (GSI) and adaptive statistical iterative reconstruction (ASIR) for reducing radiation and iodine contrast dose in abdominal CT patients with high BMI values. MATERIALS AND METHODS 26 patients (weight > 65kg and BMI ≥ 22) underwent abdominal CT using GSI mode with 300mgI/kg contrast material as study group (grou...

Object-oriented database systems (OODBS) have gained wide attention as the most promising database technology for non-standard applications like computer aided design and computer integrated manufacturing. Among the most important requirements of these applications which are supported by OODBS are complex object modeling, advanced transaction management, and version management, to mention just ...

BACKGROUND The recent implementation of the dual energy technology on CT-scanners has opened new perspectives in tissue and material characterization. This study aims to evaluate whether dual energy CT can be used to assess the concentration of cocaine of intra-intestinal illegal packets. METHODS The study was approved by the institutional review board of our institution (CER 13_027_R). From ...

We present the first 850 $\mu$m polarization observations in most active star-forming site of Rosette Molecular Cloud (RMC, $d\sim$1.6 kpc) wall Nebula, imaged with SCUBA-2/POL-2 instruments JCMT, as part B-Fields In Star-Forming Region Observations 2 (BISTRO-2) survey. From POL-2 data we find that fraction decreases continuum intensity $\alpha$ = 0.49 $\pm$ 0.08 $p \propto I^{\rm -\alpha}$ rel...

OBJECTIVE To identify the optimal dual-energy computed tomography (DECT) scanning protocol for peripheral arterial stents while achieving a low radiation dose, while still maintaining diagnostic image quality, as determined by an in vitro phantom study. METHODS Dual-energy scans in monochromatic spectral imaging mode were performed on a peripheral arterial phantom with use of three gemstone s...