Chemical exchange saturation transfer (CEST) imaging provides a unique contrast through the exchange between solute protons and bulk water protons 1. It can detect tissue acidosis and elevated protein content in acute ischemia and animal tumor models 2,3. Conventionally, a continuous wave (CW) RF pulse is applied at the solute proton frequency and the saturation is transferred to the bulk water...

In an effort to address the limitations on high-power accelerator target performance prompted by the elevated dose levels and the associated irradiation damage, an experimental study has been conducted to explore interesting new alloys and composites under the influence of protons and neutrons. Material irradiations were performed using the 200-MeV protons of the BNL Linac operating with an eff...

Pulsed femtosecond laser irradiation at low repetition rate, without any annealing, has been used to localize the growth of PbS nanoparticles, for the first time, inside a transparent porous silica matrix prepared by a sol-gel route. Before the irradiation, the porous silica host has been soaked within a solution containing PbS precursors. The effect of the incident laser power on the particle ...

low-level laser therapy (lllt) provides several benefits for patients receiving orthodontic treatment. according to some literatures, orthodontic tooth movement (otm) can be enhanced but some investigators have reported contradictory results. this article reviews the literature regarding the different aspects of the use of lllt on otm and its alterations. the general data regarding the study de...

This paper reports the effect of post-laser irradiation on the gas-sensing behavior of nickel oxide (NiO) thin films. Nanocrystalline NiO semiconductor thin films were fabricated by a sol-gel method on a nonalkaline glass substrate. The NiO samples were irradiated with a pulsed 532-nm wavelength, using a Nd:YVO(4) laser beam. The effect of laser irradiation on the microstructure, electrical con...

In this work, we have investigated the interaction of a high-power Ar+ laser beam, in a continuous multi-line regime, with Ag+-doped glass samples. The samples were subjected to the irradiation after the ion-exchange step. As a result of the irradiation, a peak appears in the absorption spectrum; its evolution depends on both the exposure time and the laser beam power. Interaction of the beam w...

We studied the protective effects of low power He-Ne laser irradiation on erythrocytes against the damage caused by experimental artificial heart-lung machines. The erythrocyte suspension in a closed circuit was perfused with a roller pump. One of two circuits was used for laser treatment and the other for control. The laser group demonstrated significantly higher erythrocyte deformability and ...

introduction: this paper presents the results of a study on the effects of two differentdoses of low-power laser irradiation on healing of deep second degree burns. material and methods: 60 rats were randomly allocated to one of four groups. adeep second-degree burn was inflicted in each rat. in the control group (cg) burns remained untreated; in groups lg1 and lg2 the burns were irradiated wit...

We describe, for the first time, the perforation of the cell membrane in the targeted single cell based on the nanosecond pulsed near-infrared (NIR) laser irradiation of a thin film of carbon nanotubes that act as an effective photon absorber as well as stimuli generator. When the power of NIR laser is over 17.5 μJ/pulse, the cell membrane after irradiation is irreversibly disrupted and results...

The surface damage caused by laser irradiation is studied to investigate the possibility of performing a depth-profile analysis of the hydrogen concentration in zircaloy-4 alloys using laserinduced plasma breakdown spectrometry. After laser irradiation, a heat-affected zone extending about 3 μm down from the top surface can be seen. The depth of this heat-affected zone is independent of the las...