Results 21 to 30 of about 4,636 (165)

Verification of IMRT and RapidArc Localized Prostate Cancer Treatment Plans Using EPID and Delta4 in vivo Dosimetry Methods [PDF]

Middle East Journal of Cancer, 2021
Background: Quality assurance for intensity modulated radiation therapy (IMRT) depends on the type of dosimetry system and its evaluation procedure. We can check both the intensity and distribution of each field as the required pretreatment verification ...
Moustafa Ahmed, Naer Baker, Khaled El-Shahat, Mohamed Akl, Ahmed Shawata   +4 more
doaj   +1 more source

Evaluation of IGRT-Induced Imaging Doses and Secondary Cancer Risk for SBRT Early Lung Cancer Patients In Silico Study

Technology in Cancer Research & Treatment, 2021
Objectives: This study performed dosimetry studies and secondary cancer risk assessments on using electronic portal imaging device (EPID) and cone beam computed tomography (CBCT) as image guided tools for the early lung cancer patients treated with SBRT.
Yan-Hua Duan ME, Heng-Le Gu MS, Xiao-Hui Yang BS, Hua Chen ME, Hao Wang MS, Yan Shao MS, Xiao-Yang Li MD, Ai-Hui Feng MS, Yan-Chen Ying MS, Xiao-Long Fu PhD, Kui Ma, Tao Zhou, Zhi-Yong Xu PhD   +12 more
doaj   +1 more source

Breast in vivo dosimetry by EPID

Journal of Applied Clinical Medical Physics, 2010
An electronic portal imaging device (EPID) is an effective detector for in vivo transit dosimetry. In fact, it supplies two‐dimensional information, does not require special efforts to be used during patient treatment, and can supply data in real time.
Fidanzio, Andrea, Greco, Francesca, Mameli, Alessandra, Azario, Luigi, Balducci, Mario, Gambacorta, Maria Antonietta, Frascino, Vincenzo, Cilla, Savino, Sabatino, Domenico, Piermattei, Angelo   +9 more
  +7 more sources

Optimizing TrueBeam jaw calibrations to reduce positional errors at customizable gantry and collimator angles [PDF]

J Appl Clin Med Phys
Abstract Background Clinical medical physicists in a radiotherapy setting are aware of the importance of maintaining linac collimators with high positional accuracy, especially when used to form junctions; however, there is a lack of quality control options available.
Sample C, Sonier M, Atwal P.
europepmc   +2 more sources

Importance of beam-matching between truebeam stx and novalis tx in pre-treatment quality assurance using portal dosimetry

Journal of Medical Physics, 2021
Flexibility and efficiency in a radiotherapy department with different linear accelerators (linacs) can be improved if they are dosimetrically equivalent, and there is no need of plan or patient-specific quality assurance (PSQA) modification.
José Alejandro Rojas-López, Daniel Venencia   +1 more
doaj   +1 more source

Exacerbations and healthcare resource utilization among COPD patients in a Swedish registry-based nation-wide study

BMC Pulmonary Medicine, 2018
Background Exacerbations of chronic obstructive pulmonary disease (COPD) are an important measure of disease severity in terms of impaired disease progression, increased recovery time, healthcare resource utilization, overall morbidity and mortality.
Gunnar Johansson, Vasili Mushnikov, Tobias Bäckström, Andreas Engström, Javaria Mona Khalid, Jennifer Wall, Fabian Hoti   +6 more
doaj   +1 more source

EPID in vivo dosimetry in RapidArc technique [PDF]

Reports of Practical Oncology & Radiotherapy, 2010
The aim of the study was to estimate the dose at the reference point applying an aSi-EPID device in the course of patient treatment.The method assumes direct proportionality between EPID signal and dose delivered to the patient reference point during the treatment session.
Slosarek, Krzysztof, Szlag, Marta, Bekman, Barbara, Grzadziel, Aleksandra   +3 more
openaire   +2 more sources

A Validation Method for EPID In Vivo Dosimetry Algorithms [PDF]

Applied Sciences, 2021
The aim of this study was to develop and apply an evaluation method for assessing the accuracy of a novel 3D EPID back-projection algorithm for in vivo dosimetry. The novel algorithm of Dosimetry Check (DC) 5.8 was evaluated. A slab phantom homogeneously filled, or with air and bone inserts, was used for fluence reconstruction of different squared ...
Marco Esposito, Livia Marrazzo, Eleonora Vanzi, Serenella Russo, Stefania Pallotta, Cinzia Talamonti   +5 more
openaire   +3 more sources

The influence of acquisition mode on the dosimetric performance of an amorphous silicon electronic portal imaging device

Journal of Medical Physics, 2017
Aims: This study investigates the impact of cine acquisition mode on the dosimetric characteristics of a Varian aS500 amorphous silicon electronic portal imaging device (a-Si EPID).
Omemh Bawazeer, Sisira Herath, Siva Sarasanandarajah, Tomas Kron, Pradip Deb   +4 more
doaj   +1 more source

Use of Amorphous Silicon (ASi) Electronic Portal Imaging Devices for Other applications for Linear Accelerator Quality Assurance [PDF]

Iranian Journal of Medical Physics, 2021
Introduction: The success of radiation therapy depends critically on the accuracy of patient alignment in treatment position day after day. The primary use for Electronic portal imaging devices (EPIDs) is to monitor patient position during daily ...
Gena Mohamed, Khaled M. El-Shahat, Mahmoud Salem, Atef El-Taher   +3 more
doaj   +1 more source