The aim of this study was to demonstrate how dosimetry with an amorphous silicon electronic portal imaging device (a-Si EPID) replaced film and ionization chamber measurements for routine pre-treatment dosimetry in our clinic. Furthermore, we described how EPID dosimetry was used to solve a clinical problem. IMRT prostate plans were delivered to a homogeneous slab phantom. EPID transit images w...

Introduction: Radiosurgery is ionizing radiation treatment. Concentration of a large amount in an area ​​the brain results ablation the lesion. The technique was designed and perfected by Dr. Lars Lexell, Swedish neurosurgeon, 1951. Meningiomas are usually benign slow-growing tumors, derived from leptomeninges. First line treatment for meningiomas surgery. They occasionally difficult to treat s...

Purpose Due to their finite range, electrons are typically ignored when calculating shielding requirements in megavoltage energy linear accelerator vaults. However, the assumption that 16 MeV need not be considered does hold operated at FLASH-RT dose rates (~200× clinical rate), where rate from bremsstrahlung photons is an order of magnitude higher than 18 MV beam for which was designed. We inv...

AlignRT is a surface imaging system that has been utilized for localizing and tracking patient position during radiotherapy. AlignRT has two calibration procedures that can set the system's isocenter called "Monthly Calibration" (MC) and "Isocentre Calibration" (IC). The MC utilizes a calibration plate. In addition to the calibration plate, the IC utilizes a cubic phantom that is imaged with th...