INTRODUCTION Radiosurgery is now an established method of satisfactory pain control in patients with trigeminal neuralgia (TN). The Varian Truebeam STx (Varian Medical Systems, Palo Alto, CA) linear accelerator (LINAC) system is an arc-based, frameless stereotactic radiosurgery system used for the treatment of TN. To our knowledge, there has been only one published series of patient histories t...

Radiotherapy employs high energy radiation for the purpose of cancer treatment. Precise patient positioning is essential with the current use of complicated treatment plans. Portal imaging is often used for pre and during treatment anatomical setup verification. Currently the most advanced and widely used amorphous silicon Electronic portal imaging device (EPID) (aSi 1000) and the TrueBeam line...

The aim of this study was to characterize electron contamination a flattened (FF) and an unflattened (FFF) Varian Clinac iX 6X 15X photon beams using Monte Carlo (MC) simulation. EGSnrc MC technique used model the head simulate dose distribution FF FFF beam in water phantom. materials geometrical data linac were provided by Tan Tock Seng Hospital (TTSH) Singapore. modeled removing flattening fi...

introduction electron linear accelerator (linac) can be used for neutron production in boron neutron capture therapy (bnct). bnct is an external radiotherapeutic method for the treatment of some cancers. in this study, varian 2300 c/d linac was simulated as an electron accelerator-based photoneutron source to provide a suitable neutron flux for bnct. materials and methods photoneutron sources w...

This investigation aimed to measure and commission small unflat photon beams using the detectors described in our previous study10. Furthermore, dosimetric parameters of small-field flat were compared provide a better interpretation beam energy spectrum. The TrueBeam linear accelerator (TrueBeam LINAC, Varian Medical Systems) was employed this study. 10 6 MV used output factor, depth dose, prof...

A new development of a linear accelerator machine has been installed in Indonesia for the first time. There is no dosimetric protocol specifically discussing measurement absorbed dose to water Halcyon linac. But, few global protocols determine linac which at same substance. This paper describes dosimetry parameter 6 MV flattening filter-free (FFF) photon beam produced from model Varian using IA...

background: monte carlo method (mc) has played an important role in design and optimization of medical linacs head and beam modeling. the purpose of this study was to compare photon beam features of two commercial linacs, varian 21ex and elekta sl-25 using mcnp4c mc code. materials and methods: the 6mv photon beams of varian 21ex and elekta sl-25 linacs were simulated based on manufacturers pro...

PURPOSE To evaluate the neutron and photon dose equivalent rate (H(n,D) and H(G)) at the outer maze entrance and the adjacent treatment console area after the installation of a Varian Clinac 23EX accelerator with a higher beam energy than its predecessor. The evaluation was based on measurements and comparison with several empirical calculations. The effectiveness of borated polyethylene (BPE) ...

We have simulated the head geometry of a Varian Clinac 2100C/2300C medical accelerator in a Monte Carlo calculation to produce photoneutrons and transport them through the head shielding into a typical therapy room (modeled by a test cell at Varian Associates). The fast neutron leakage fluence and energy spectra have been calculated at 7 positions around the linac head for typical beam operatio...