1Department of Radiation Oncology, SevenHills Hospital, Mumbai, India 2Radiological Physics and Advisory Division, Bhabha Atomic Research Centre, Mumbai, India Received October 17, 2015; Revised January 02, 2016; Accepted January 16, 2016; Published Online February 03, 2016 Original Article Abstract Purpose: The aim of this study was to estimate local confidence limit for 6 MV photon beam based...

The purpose of this work was to investigate the use of an experimental CMOS (Complementary Metal-OxideSemiconductor) APS (Active Pixel Sensor) for tracking of moving fiducial markers during radiotherapy. The APS has an active area of 5.4 x 5.4 cm and maximum full frame read-out rate of 20 frame s−1, with the option to read out a Region-Of-Interest (ROI) at an increased rate. It was coupled to a...

This article presents an overview of pre-treatment verification of volumetric modulated arc therapy (VMAT) with electronic portal imaging devices (EPIDs). Challenges to VMAT verification with EPIDs are discussed including EPID sag/flex during rotation, acquisition using cine-mode imaging, image artefacts during VMAT and determining the gantry angle for each image. The major methods that have be...

By comparing predicted dose images with physically acquired images, radiotherapy fields may be verified. A good portal dose verification chain should be accurate and unrestricted in terms of gantry angle and patient-imager air gap distance. We present latest enhancements and rigorous tests of a portal dose prediction framework based on Monte Carlo (MC) radiation transport. We also present initi...

The aim of this study was to develop and apply an evaluation method for assessing the accuracy a novel 3D EPID back-projection algorithm in vivo dosimetry. Dosimetry Check (DC) 5.8 evaluated. A slab phantom homogeneously filled, or with air bone inserts, used fluence reconstruction different squared fields. VMAT plans anatomical sites were delivered on anthropomorphic phantom. Dose distribution...

The importance of medical physics methods in modern radiation therapy is shown. types irradiation used are considered. At each stage, it necessary to maintain high accuracy all procedures. One the significant stages treatment planning, where quality control plan carried out ensure patient. process plans with intensity modulation (Volumetric Modulated Arc Therapy - VMAT) on VitalBeam linear acce...