Results 191 to 200 of about 25,468 (231)

EPID-BASED DOSIMETRY

Radiotherapy and Oncology, 2009
The complexity of radiotherapy today demands thorough verification of the dose delivered to the patient. Dosimetry using electronic portal imaging devices (EPIDs) has received considerable attention recently, since with this method dose verification can be performed accurately and efficiently, both pre-treatment and in vivo.
openaire   +1 more source

Detection and correction for EPID and gantry sag during arc delivery using cine EPID imaging

Medical Physics, 2012
Electronic portal imaging devices (EPIDs) have been studied and used for pretreatment and in-vivo dosimetry applications for many years. The application of EPIDs for dosimetry in arc treatments requires accurate characterization of the mechanical sag of the EPID and gantry during rotation. Several studies have investigated the effects of gravity on the
Pejman Rowshanfarzad, Mahsheed Sabet, Daryl J. O'Connor, Peter M. McCowan, Boyd M. C. McCurdy, Peter B. Greer   +5 more
openaire   +2 more sources

EPID in vivo Dosimetry

2018
Introduction: The most modern radiotherapy devices are equipped with an Electronic Portal Imaging Device (EPID) system which is located on opposite side of the machine’s head. EPID system is often used to setting up the position verification during or between radiotherapy sessions.
Mohammadi, Mahdi, Haghparast, Abbas
openaire   +1 more source

Evaluation of set-up errors and determination of set-up margin in pelvic radiotherapy by electronic portal imaging device (EPID)

Journal of Radiotherapy in Practice, 2020
The error in set-up of patients is an inherent part of treatment processes. The positioning errors can be used to determine the margins of the planning target volume (PTV) to cover the target volume, while minimising the radiation dose delivered to ...
Vajiheh Vejdani Noghreiyan, S. Nasseri, K. Anvari, M. Naji, M. Momennezhad   +4 more
semanticscholar   +1 more source

An error detection method for real-time EPID-based treatment delivery quality assurance.

Medical Physics (Lancaster), 2020
PURPOSE To quantify the error detection power of a new treatment delivery error detection method. The method validates monitor-unit-resolved beam apertures using real-time EPID images. METHODS The on-board EPID imager was used to measure cine-EPID (~10 
Victor G. L. Alves, Mahmoud Ahmad, E. Aliotta, Wookjin Choi, J. Siebers   +4 more
semanticscholar   +1 more source

Simplifying EPID dosimetry for IMRT treatment verification

Medical Physics, 2011
Purpose:Electronic portal imaging devices (EPIDs) are increasingly used for IMRT dose verification, both pretreatment andin vivo. In this study, an earlier developed backprojection model has been modified to avoid the need for patient‐specific transmission measurements and, consequently, leads to a faster procedure.Methods:Currently, the transmission ...
R, Pecharromán-Gallego, Anton, Mans, Jan-Jakob, Sonke, Joep C, Stroom, Igor, Olaciregui-Ruiz, Marcel, van Herk, Ben J, Mijnheer   +6 more
openaire   +2 more sources

Catching errors with in vivo EPID dosimetry

Medical Physics, 2010
The potential for detrimental incidents and the ever increasing complexity of patient treatments emphasize the need for accurate dosimetric verification in radiotherapy. For this reason, all curative treatments are verified, either pretreatment or in vivo, by electronic portal imaging device (EPID) dosimetry in the Radiation Oncology Department of the ...
Mans, A., Wendling, M., McDermott, L. N., Sonke, J. J., Tielenburg, R., Vijlbrief, R., Mijnheer, B., van Herk, M., Stroom, J. C.   +8 more
openaire   +3 more sources

Generalized EPID calibration for in vivo transit dosimetry

Physica Medica, 2011
Many researchers are studying new in vivo dosimetry methods based on the use of Elelctronic portal imaging devices (EPIDs) that are simple and efficient in their daily use. However the need of time consuming implementation measurements with solid water phantoms for the in vivo dosimetry implementation can discourage someone in their use.
Andrea, Fidanzio, Savino, Cilla, Francesca, Greco, Laura, Gargiulo, Luigi, Azario, Domenico, Sabatino, Angelo, Piermattei   +6 more
openaire   +3 more sources

Using in vivo EPID images to Detect and Quantify Patient Anatomy Changes with Gradient Dose Segmented Analysis.

Medical Physics (Lancaster), 2020
PURPOSE To investigate the utility of Gradient Dose Segmented Analysis (GDSA) in combination with in vivo EPID images to predict changes in the PTV mean dose for patient cases. Also, we use the GDSA analysis to retrospectively analyze patients treated in
J. Steers, Jorge Arturo Zavala Bojorquez, K. Moore, C. Bojechko   +3 more
semanticscholar   +1 more source

The effect of the choice of patient model on the performance of in vivo 3D EPID dosimetry to detect variations in patient position and anatomy.

Medical Physics (Lancaster), 2019
PURPOSE in vivo EPID dosimetry is meant to trigger on relevant differences between delivered and planned dose distributions and should therefore be sensitive to changes in patient position and patient anatomy.
I. Olaciregui-Ruiz, R. Rozendaal, S. V. van Kranen, B. Mijnheer, A. Mans   +4 more
semanticscholar   +1 more source