All living things are made of compounds containing mostly carbon, so lots of things that are âorganicâ to a gardener are also âorganicâ to a chemist. Of course, there are many carbon compounds that are human-made, or synthetic. To chemists, these are organic compounds too.
AXUMIN is a drug for detection of prostate cancer recurrence in men who have been treated for prostate cancer but have persistently high prostate specific antigen (PSA) in their blood. High PSA in the blood of these patients is a suspicious sign that cancer is coming back or spreading.
An axicon, energywise, is the most efficient method for generating a diffraction-free beam. Yet one of the impediments to wide use of these optical elements is the cost related to the way they are manufactured. Recently we proposed a novel optical element-Fresnel axicon (Opt.Lett. 31, 1890, 2006) - which enables to overcome this problem while providing advantages such as compactness and very low bulk absorption. Prototypes of the Fresnel axicon were manufactured.In the present work we report the first experimental results characterising the optical properties of this novel device, which bridges the gap between diffractive axicons and their refractive counterparts.evin Gourley; Ilya Golub and Brahim ChebbiFirst experimental demonstration of a Fresnel axicon, Proc. SPIE 7099, Photonics North 2008, 70990D (June 18, 2008); doi:10.1117/12.807162; http://dx.doi.org/10.1117/12.807162.