Results 21 to 30 of about 66,716 (273)

Determination of the electronic portal imaging device pixel-sensitivity-map for quality assurance applications. Part 2: Photon beam dependence. [PDF]

J Appl Clin Med Phys, 2022
Purpose The EPID PSM is a useful EPID calibration method for QA applications. The dependence of the EPID PSM on the photon beam used to acquire it has been investigated in this study for the four available PSM methods.
Barnes MP, Sun B, Oborn BM, Lamichhane B, Szwec S, Schmidt M, Cai B, Menk F, Greer P.   +8 more
europepmc   +2 more sources

Long-term performance monitoring of a-Si 1200 electronic portal imaging device for dosimetric applications. [PDF]

J Appl Clin Med Phys
Purpose Recently, dosimetri applications of the electronic portal imaging device (EPID) in radiotherapy have gained popularity. Confidence in the robust and reliable dosimetric performance of EPID detectors is essential for their clinical use. This study
Kutuzov I, Rivest R, VanUytven E, McCurdy B.   +3 more
europepmc   +2 more sources

Characterization of a novel large-area electronic portal imaging device system for a ring-shaped HalosTx linear accelerator in radiotherapy quality assurance. [PDF]

Quant Imaging Med Surg
Background Electronic portal imaging device (EPID)-based in vivo dosimetry (IVD) has attracted considerable interest in recent years. Nevertheless, the limited detection area of conventional EPID systems has hindered their broad clinical adoption ...
Dai G, Gao D, Xiao Q, Song Y, Li G, Bai S.   +5 more
europepmc   +2 more sources

A quality assurance phantom for electronic portal imaging devices [PDF]

Journal of Applied Clinical Medical Physics, 2011
Electronic portal imaging device (EPID) plays an important role in radiation therapy portal imaging, geometric and dosimetric verification. Consistent image quality and stable radiation response is necessary for proper utilization that requires routine ...
Cao, Minsong, Cheng, Chee-Wai, Das, Indra J., Johnstone, Peter A.S., Misic, Vladimir, Scheuring, Klaus, Schüle, Edmund   +6 more
core   +4 more sources

Small field measurements using electronic portal imaging device

Biomedical Physics & Engineering Express
Abstract Purpose/Objective. Small-field measurement poses challenges. Although many high-resolution detectors are commercially available, the EPID for small-field dosimetry remains underexplored. This study aimed to evaluate the performance of EPID for small-field measurements and to derive tailored correction factors ...
A Aziz Sait, SA Yoganathan, Glenn W Jones, Tusar Patel, Nikhil Rastogi, SP Pandey, Sunil Mani, Raghavendiran Boopathy   +7 more
openaire   +3 more sources

The effect of respiratory motion on electronic portal imaging device dosimetry. [PDF]

J Appl Clin Med Phys, 2019
There is an increasing need to develop methods for in vivo verification of the delivery of radiotherapy treatments. Electronic portal imaging devices (EPID's) have been demonstrated to be of use for this application.
Fielding AL, Mendieta JB, Maxwell S, Jones C.   +3 more
europepmc   +2 more sources

Quality assurance of geometric accuracy based on an electronic portal imaging device and log data analysis for Dynamic WaveArc irradiation. [PDF]

J Appl Clin Med Phys, 2018
The purpose of this study was to develop a simple verification method for the routine quality assurance (QA) of Dynamic WaveArc (DWA) irradiation using electronic portal imaging device (EPID) images and log data analysis.
Hirashima H, Miyabe Y, Nakamura M, Mukumoto N, Mizowaki T, Hiraoka M.   +5 more
europepmc   +2 more sources

Investigation of the mechanical performance of Siemens linacs components during arc: gantry, MLC, and electronic portal imaging device [PDF]

Medical Devices: Evidence and Research, 2015
Pejman Rowshanfarzad,1 Peter Häring,2 Hans L Riis,3 Sune J Zimmermann,3 Martin A Ebert1,4 1School of Physics, The University of Western Australia, Crawley, WA, Australia; 2German Cancer Research Center (DKFZ), Medical Physics in Radiation Oncology ...
Rowshanfarzad P, Häring P, Riis HL, Zimmermann SJ, Ebert MA   +4 more
doaj   +2 more sources

Detection of the failed-tolerance causes of electronic-portal-imaging-device-based <i>in vivo</i> dosimetry using machine learning for volumetric-modulated arc therapy: A feasibility study. [PDF]

Phys Imaging Radiat Oncol
Saiyo N, Kojima H, Noto K, Isomura N, Tsukamoto K, Yamaguchi S, Segawa Y, Kohigashi J, Takemura A.   +8 more
europepmc   +2 more sources

Determination of dosimetric leaf gap using amorphous silicon electronic portal imaging device and its influence on intensity modulated radiotherapy dose delivery

Journal of Medical Physics, 2015
As complex treatment techniques such as intensity modulated radiotherapy (IMRT) entail the modeling of rounded leaf-end transmission in the treatment planning system, it is important to accurately determine the dosimetric leaf gap (DLG) value for a ...
S Timothy Peace Balasingh, I Rabi Raja Singh, K Mohamathu Rafic, S Ebenezer Suman Babu, B Paul Ravindran   +4 more
doaj   +2 more sources