A Monte Carlo model of an Elekta Precise linear accelerator has been built and verified by measured data for a 6 and 10 MV photon beam running with and without a flattening filter in the beam line. In this study the flattening filter was replaced with a 6 mm thick copper plate, provided by the linac vendor, in order to stabilize the beam. Several studies have shown that removal of the filter im...

We present a non-photorealistic rendering technique to transform color images and videos into painterly abstractions. It is based on a generalization of the Kuwahara filter that is adapted to the local shape of features, derived from the smoothed structure tensor. Contrary to conventional edge-preserving filters, our filter generates a painting-like flattening effect along the local feature dir...

Background: Recently, the Flattening Filter Free (FFF) beams, which allow a dose rate increase of up to four times compared to the normal dose rate, have been incorporated into radiation therapy machines. The aim of this study is to evaluate antitumor activity in hypoxic cells irradiated with different dose rates using FFF beams and to identify the casual mechanism for cellular damage during ir...