Results 41 to 50 of about 7,705 (226)

Two-dimensional exit dosimetry using a liquid-filled electronic portal imaging device and a convolution model. [PDF]

, 1997
BACKGROUND AND PURPOSE: To determine the accuracy of two-dimensional exit dose measurements with an electronic portal imaging device, EPID, using a convolution model for a variety of clinically relevant situations.
Mijnheer, B, Hans Uiterwaal, Uiterwaal, Hans, Van Herk, Marcel, Mijnheer, Ben, Boellaard, R, Ben Mijnheer, Boellaard, Ronald, Uiterwaal, H, Ronald Boellaard, van Herk, M, Van Herk, Marcel; id_orcid, Marcel van Herk   +12 more
core   +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

Improvement of radiotherapy treatment delivery accuracy using an electronic portal imaging device [PDF]

, 2006
Reliable application of advanced external beam techniques for the treatment of patients with cancer, such as intensity modulated radiotherapy, requires an adequate quality assurance programme for the verification of the dose delivery.
Dirkx, M. L.P., de Boer, J. C.J., Heijmen, B. J.M.   +2 more
core   +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

Comparing Accuracy of Thermoplastic Mask versus Commercial Bra for the Immobilization of Pendulous Breast During Radiation Therapy Treatment: A Retrospective Cohort Study

Advances in Radiation Oncology, 2021
Purpose: This study aimed to compare thermoplastic mask with bra in terms of setup reproducibility and immobilization of pendulous breasts during radiation therapy (RT).
Zaheeda Mulla, BTech (RT), Omar Iskanderani, MD, FRCP, Amina Weber, Diploma (RT), Abdullah AlMohamad, Diploma (RT), Mohammed Sheikh Al-Amoodi, MD, Shamel Soaida, MBBCh, MSc, MD   +5 more
doaj   +1 more source

Utilization of Electronic Portal Imaging Device (EPID) For Setup Verification and Determination of Setup Margin in Head and Neck Radiation Therapy [PDF]

Iranian Journal of Medical Physics, 2020
Introduction: Radiation therapy involves a multistep procedure; therefore, the error in patient set up is an inherent part of the treatment. Main purpose of this study was to determine the clinical target volume (CTV) to planning target volume (PTV) in ...
vajiheh vejdani noghreiyan, shahrokh naseri, Mehdi Momennezhad   +2 more
doaj   +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

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

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