Accurate alignment of linear accelerator table rotational axis with radiation isocenter is critical for noncoplanar radiotherapy applications. The purpose of the present study is to develop a method to align the table rotation axis and the MV isocenter to submillimeter accuracy. We developed a computerized method using electronic portal imaging device (EPID) and measured alignment stability ove...

PURPOSE To develop a method for removing the effect of support arm backscatter from Varian electronic portal imaging devices (EPIDs), improving the dosimetric abilities of the imager. METHODS A physical, kernel based model of the backscatter signal produced during an exposure was developed. The model parameters were determined through an optimization process, comparing measured images without...

Recently, with the advent of linear accelerators equipped with on-board x-ray images and advanced imaging technologies, image-guided radiotherapy (IGRT) has gained worldwide momentum in the radio therapeutic management of cancers in terms of volumetric information-based accurate tumor localization, real-time patient setup and margin reduction [1,2]. The involved technologies include digital rad...

PURPOSE With the development of patient portals, the opportunity exists to identify gaps in practice by analyzing priorities patients place on the receipt and comprehension of radiology reports. Our purpose was to describe the nature of radiology-specific patient information requests by analysis of patient-initiated messages submitted through a web-based electronic patient portal. METHODS Ins...

epidural analgesia for emergency Caesarean section: a meta-analysis. Epidural lidocaine– bicarbonate– adrenaline vs levobupivacaine for emergency Cae-sarean section: a randomised controlled trial. Anaesthesia 2008; 63: 243–9 3 Regan KJ, O'Sullivan G. The extension of epidural blockade for emergency Caesarean section: a survey of current UK practice. Editor—Stone and colleagues 1 published an ex...

The main objectives of this study are to (1) analyze the sensitivity of various gamma index passing rates using different types of detectors having different resolutions and (2) investigate the sensitivity of various gamma criteria in intensity-modulated radiation therapy (IMRT) and volumetrically modulated arc therapy (VMAT) quality assurance (QA) for the detection of systematic multileaf coll...

PURPOSE The aim of this study was to develop a phantom and analysis software that could be used to quickly and accurately determine the location of radiation isocenter using the Electronic Portal Imaging Device (EPID). The phantom could then be used as a static reference point for performing other tests including: radiation vs. light field coincidence, MLC and Jaw strip tests, and Varian Optica...

Introduction: In radiation therapy, determining the location of the tumor accurately during irradiation is one of the most important requirements. However, lung tumors are not fixed in a single location and move during irradiation due to respiratory motion. Due to limitations in assessing such movements, using a lung phantom can be useful and operational for their fast, easy an...

conclusions the sophistication of electronic prescription and integration with ehr will become a reality, if all its stakeholders collaborate in developing fast and secure electronic prescription systems. it is plausible that the required infrastructure should be provided for implementation of the national integrated electronic prescription systems in countries without the system. given the bar...