Rotatable LYSO-GAPD DEXA detector for providing improved spatial resolution

A rotatable lutetium-yttrium-oxyorthosilicate-Geiger-mode-avalanche photodiode (LYSO-GAPD) DEXA detector that can be configured into either a normal-resolution or a high-resolution mode, was proposed and examined. A 3 × 3 × 2 mm3 LYSO was coupled to a 3 × 3 mm2 GAPD. The versatile transformation of the high-resolution mode was possible by employing the rotating controller for the DEXA detector on its own axis, and the intrinsic resolution in this mode was improved by ∼ 33% compared to the normal-resolution mode. Dual-energy X-ray spectra and imaging capabilities were evaluated in both acquisition modes. The respective peak positions of low- and high-energy-beam of normal-resolution mode (high-resolution mode) were 1330 mV (1262 mV) and 2347 mV (2267 mV). The respective peak-to-valley ratios of low- and high-energy-beam of normal-resolution mode (high-resolution mode) were ∼ 2.8 (∼ 2.9) and ∼ 1.2 (∼ 1.1). Considerable improvements in phantom images such as overall contrast and fine-spot detectability were observed in the high-resolution mode. It should be noted that spatial resolution was improved by reducing the detection-area from 3 × 3 mm2 to 2 × 3 mm2 in the high-resolution mode, but count rate was also decreased. These results demonstrated that a rotatable LYSO-GAPD DEXA detector allows to provide high versatility for both high-resolution mode and normal-resolution mode with a single detector.

Physicochemical Changes and Mechanical Improvement of Ni Coating Layers Using High Energy Beam Treatment

In this study, the improvement of mechanical properties by physicochemical changes of Ni coating layer after irradiation of high energy beam (HEB) was reported through spectroscopy, scanning electron microscopy (SEM), X-ray diffraction (XRD), X-ray fluorescence (XRF), X-ray photoelectron spectroscopy (XPS), and nanoindenter. This surface heating method of the irradiation of HEB has advantages of short heating time, uniform temperature distribution, and high heat efficiency by selectively heating desired parts, compared to other post-heat treatment methods. The main reason for this is that irradiation of a irradiation of HEB on the Ni coating layer causes a change in the energy amplitude of the dipole formed in the material. Therefore, the intermolecular friction caused the Ni coating layer to be oxidized to NiO even in a short time, improving the mechanical properties of the surface. In order to understand the diffusion effect of the irradiation of HEB, the indentation hardness, and the skin depth of the Ni coating layer was experimentally performed and theoretically predicted simultaneously.

Research into Silicon Nanoparticles as Agents for UHF Hyperthermia In Vitro

The current approaches to cancer treatment, including surgery and high-energy beam irradiation, do not always give satisfactory results for a number of oncological neoplasms. One of the promising areas in oncology is the use of nanoparticles selectively heated by external action as agents for hyperthermia of some types of tumors. In this work, we performed selective heating of suspensions of silicon nanoparticles using a device for electromagnetic high-frequency therapy (UHF-60).