The clinical application of the flattening filter-free photon beam (FFF) has enjoyed greater use due to its advantage of reduced treatment time because of the increased dose rate. Its unique beam characteristics, along with the very high-dose rate, require a thorough knowledge of the capability and accuracy in FFF beam modeling, planning, and delivery. This work verifies the feasibility of mode...

We present a new optical system that significantly reduces helicity-dependent instrumental intensity asymmetries. It is an extension of a previous scheme [Appl. Opt.47, 2465 (2008)], where one laser beam is split using a polarizing beam splitter into two with orthogonal linear polarizations. The beams are sent through a chopper, allowing only one to pass at a time. The two temporally separated ...

Leksell Gamma Knife® IconTM with integrated Cone Beam CT (CBCT) system provides increased workflow flexibility with e.g. planning on frameless images and subsequent frameless dose delivery. The stereotactic reference is given by the CBCT images taken prior to treatment. Co-registration of the planning image volume with the CBCT volume gives the transformation mapping of the planned isocenter po...

The purpose of this study is to describe the comprehensive commissioning process and initial clinical experience of the Mevion S250 proton therapy system, a gantry-mounted, single-room proton therapy platform clinically implemented in the S. Lee Kling Proton Therapy Center at Barnes-Jewish Hospital in St. Louis, MO, USA. The Mevion S250 system integrates a compact synchrocyclotron with a C-inne...

This paper details the design, manufacture, and performance test results of a highly integrated Rx multi-beam active phased array antenna for aerial communications. The proposed comprises three tile-phased antennas consisting antennas, radio frequency, beamforming units. A system revealed achieved gain-to-noise temperature -6 dB/K beam pointing accuracy below 0.4° with four independently operab...

A novel active focusing system was developed for enhancing the irradiation performance of 18 MeV medical cyclotron in operation at Bern University Hospital view production non-conventional radioisotopes using solid targets. In several cases, such as 43Sc and 44Sc, beam has to be kept stable within a very small target about 5 mm diameter. For this purpose, we conceived realized an apparatus base...

Intensity modulated radiation therapy (IMRT) treatment planning typically considers beam optimization and beam delivery as separate tasks. Following optimization, a multi-leaf collimator (MLC) or other beam delivery device is used to generate fluence patterns for patient treatment delivery. Due to limitations and characteristics of the MLC, the deliverable intensity distributions often differ f...

PURPOSE The TOPAS Tool for Particle Simulation was developed to make Geant4 Monte Carlo simulation more readily available for research and clinical physicists. Before releasing this new tool to the proton therapy community, several test have been performed to ensure accurate simulations in a variety of proton therapy setups. METHODS TOPAS can model a passive scattering or scanning beam treatm...

The Beam Delivery System (BDS) of the proposed TESLA linear collider contains some of the tightest magnet alignment tolerances of the entire machine. In [1], luminosity stability issues were covered in some detail, with specific emphasis on ground motion and magnet vibration. It was shown that ground motion effects and fast magnet vibration leads to relatively high values of both linear and sec...