Results 41 to 50 of about 7,743 (226)

An Analysis of Quality Assurance for Intensity-modulated Radiation Therapy and Volumetric Modulated Arc Therapy Treatment Plans Using Two Dosimetric Methods: The arcCHECK System and EPIbeam Based Dosimetric Approach

Journal of Medical Physics
Aim: The current study is to assess and compare the performance of an electronic portal imaging device (EPID)-based dosimetry system electronic portal imaging beam (EPIbeam) and a three-dimensional (3D) diode array system (ArcCHECK) using various gamma ...
Ajay Katake, Lalit Kumar, Balbir Singh, Amit Sharma, Deepak Basandrai   +4 more
doaj   +1 more source

Intra- and inter-radiation therapist reproducibility of daily isocenter verification using prostatic fiducial markers

Radiation Oncology, 2006
Background We sought to determine the intra- and inter-radiation therapist reproducibility of a previously established matching technique for daily verification and correction of isocenter position relative to intraprostatic fiducial markers (FM ...
Miller Robert W, Cannon Angela, Arora Barbara C, Li Guang, Xie Huchen, Guion Peter, Havelos Jan, Jocelyn Lucresse, Ayele Asna, Susil Robert C, Ning Holly, Ullman Karen L, Norman Coleman C, Camphausen Kevin, Ménard Cynthia   +14 more
doaj   +1 more source

Assessment of the dosimetric performance of the Mobius3D against portal dose measurements in patient-specific quality assurance

Journal of Medical Physics, 2023
Aim: The Mobius3D software addresses limitations lacking in measurement-based methods in patient-specific quality assurance (QA). The objective of this study was to validate its dosimetric performance against conventionally used portal dose measurements ...
Yasmine Joy M. Labagnoy, Sornjarod Oonsiri, Mananchaya Vimolnoch, Sakda Kingkaew   +3 more
doaj   +1 more source

Impact of dose rate on accuracy of intensity modulated radiation therapy plan delivery using the pretreatment portal dosimetry quality assurance and setting up the workflow at hospital levels

Journal of Medical Physics, 2015
The aim of this study was to examine the impact of dose rate on accuracy of intensity modulated radiation therapy (IMRT) plan delivery by comparing the gamma agreement between the calculated and measured portal doses by pretreatment quality assurance (QA)
Karunakaran Kaviarasu, N Arunai Nambi Raj, K Krishna Murthy, A Ananda Giri Babu, Bhaskar Laxman Durga Prasad   +4 more
doaj   +1 more source

All‐in‐One Analog AI Hardware: On‐Chip Training and Inference with Conductive‐Metal‐Oxide/HfOx ReRAM Devices

Advanced Functional Materials, EarlyView.
An all‐in‐one analog AI accelerator is presented, enabling on‐chip training, weight retention, and long‐term inference acceleration. It leverages a BEOL‐integrated CMO/HfOx ReRAM array with low‐voltage operation (<1.5 V), multi‐bit capability over 32 states, low programming noise (10 nS), and near‐ideal weight transfer.
Donato Francesco Falcone, Victoria Clerico, Wooseok Choi, Tommaso Stecconi, Folkert Horst, Laura Bégon‐Lours, Matteo Galetta, Antonio La Porta, Nikhil Garg, Fabien Alibart, Bert Jan Offrein, Valeria Bragaglia   +11 more
wiley   +1 more source

Daily organ tracking in intensity-modulated radiotherapy of prostate cancer using an electronic portal imaging device with a dose saving acquisition mode [PDF]

, 2006
BACKGROUND AND PURPOSE: Daily use of conventional electronic portal imaging devices (EPID) for organ tracking is limited due to the relatively high dose required for high quality image acquisition.
Thalmann, Sandrine, Mini, Roberto, Vetterli, Daniel, Behrensmeier, Frank, Aebersold, Daniel M, Born, Ernst J, Kemmerling, Ludger, Greiner, Richard H   +7 more
core   +1 more source

Assessment of three-dimensional set-up errors in conventional head and neck radiotherapy using electronic portal imaging device

Radiation Oncology, 2007
Background Set-up errors are an inherent part of radiation treatment process. Coverage of target volume is a direct function of set-up margins, which should be optimized to prevent inadvertent irradiation of adjacent normal tissues. The aim of this study
Devi P Reena, Agarwal Jai, Kadam Avinash, Chopra Supriya, Gupta Tejpal, Ghosh-Laskar Sarbani, Dinshaw Ketayun   +6 more
doaj   +1 more source

Dosimetry with a fluoroscopic electronic portal imaging device [PDF]

Medical Physics, 2000
Techniques for dosimetric verification of radiotherapy treatments using a CCD camera based fluoroscopic electronic portal imaging device (EPID) are described. The dosimetric characteristics of the EPID were investigated and a method was developed to derive portal dose images (PDIs) from measured EPID images.
openaire   +1 more source

Spin‐Split Edge States in Metal‐Supported Graphene Nanoislands Obtained by CVD

Advanced Materials, EarlyView.
Combining STM measurements and ab‐initio calculations, we show that zig‐zag edges in graphene nanoislands grown on Ni(111) by CVD retrieve their spin‐polarized edge states after intercalation of a few monolayers of Au. ABSTRACT Spin‐split states localized on zigzag edges have been predicted for different free‐standing graphene nanostructures.
Michele Gastaldo, Masoud Mansouri, Carlos Garcia‐Fernandez, Daniel Sánchez‐Portal, Aran Garcia‐Lekue, Gustavo Ceballos, Aitor Mugarza   +6 more
wiley   +1 more source

In vivo dosimetry with a liquid-filled electronic portal imaging device [PDF]

, 1998
The thesis describes the use of a liquid-filled electronic portal imaging device, EPID, for in vivo dosimetry, i.e., for the verification of transmission, exit, and midplane dose. First, the application of the EPID to measure the transmission dose, i.e.,
Boellaard, R.
core   +1 more source