We present an example when profile measurement and modeling of an Elekta Agility multileaf collimator (MLC) had a large effect specifically on arc therapy plan quality assurance (QA) results using ArcCheck. ArcCheck absolute dose measurements of these plans were systematically lower than planned by 3-10%. Failing QA results were seen even with unmodulated static and conformal arcs. Furthermore,...

Backprojection filtering algorithms are presented for three variable orbit fan-beam geometries. Expressions for the fanbeam projection and backprojection operators are given for a flat detector fan-beam geometry with fixed focal length, with variable focal length, and with fixed focal length and off-center focusing. Backprojection operators are derived for each geometry using transformation of ...

The design features of a 17 GHz chopper prebuncher injection system are described, and initial test results operating with a 500 kV low emittance electron gun and single section 17 GHz linac are presented. The 17 GHz traveling wave relativistic klystron that provides RF power to the linac structure, and the 500 kV electron gun that forms the low emittance (βγ ε = 3π mm-mradian) source for the i...

Cyclotrons are used in medical applications mostly for radioisotope production for positron emission tomography (PET) and proton therapy. PET is a diagnostic technique requiring daily production of radiotracers. Most of the PET cyclotron centres produce 18F for the synthesis of fl uorodeoxyglucose (FDG). The cyclotron laboratory in Bern is a part of the SWAN project aiming at the realization of...

Purpose: The purpose of this study is to provide technical information on commissioning the TrueBeam STx 6 MV flattening-filter free (FFF) beam in RayStation treatment planning system (TPS) for stereotactic radiosurgery (SRS) and body radiation therapy (SBRT) treatments. Methods: For modeling, percent depth dose curves, profiles output factors jaw-collimated fields cones as well X-jaws transmis...

We present a new approach in realizing multicore fibre fan-in/fan-out (FIFO) device. Using simple image demagnification by two fibre optic collimators a compact FIFO device for 4-core multicore fibre is fabricated with low crosstalk. Introduction One of the key optical components for space division multiplexed (SDM) transmission systems [1-3] is an efficient and stable SDM multiplexer/demultipl...