Pigments are insoluble particulate materials that provide colour, opacity, gloss control, rheological control, and certain functions such as corrosion inhibition or magnetic moment.
The other component materials of surface coatings are pigments, which provide colour, opacity, gloss, and other properties; solvents or carrier liquids, which provide a liquid medium for applying the film-forming ingredients; and additives, which provide a number of special properties.
The firing of the PbO SnO2 SiO2 system allows tin oxide to react forming a lead stannate intermediary phase and, if heated to sufficient temperature, to recrystallize as finer particles of cassiterite, which provide increased opacity as compared to unreacted cassiterite [29, 30].
The tubes are laser cut into the scaffold pattern, platinum markers are added to provide radio-opacity, and the stent is crimped onto the balloon catheter delivery system.
These particles contain, in addition to methylmethacrylate copolymers, benzoyl peroxide BPO (the so-called initiator), and zirconium or barium to provide radio-opacity [ 17].
We chose a cadmium compound for its convenience, but other high electron density materials in powder form (such as silica or lead) can be used to provide radio-opacity with lower toxicity.
This reduction in backscattering is significant for many of the applications of films containing TiO2, such as coatings and paper, which rely upon multiple scattering from large numbers of particles to provide the desired opacity.
This technique enables an objective, qualitative assessment of the symptoms caused by large vitreous opacities and may provide a simple yet useful adjunctive tool in evaluating the risk-benefit ratio of vitrectomy in patients with large symptomatic vitreous floaters.
To our knowledge, this is the first description of using OCT as an objective, qualitative assessment of symptoms caused by large vitreous opacities and may provide a simple yet useful adjunctive tool in evaluating the risk-benefit ratio of vitrectomy in patients with large symptomatic vitreous floaters.
The realized device has been tested in order to evaluate its ability to provide useful information on colours, surface opacity and profile of the detected objects.
