Results 1 to 10 of about 244,363 (195)
Evaluation of Daily CT for EPID-Based Transit In Vivo Dosimetry [PDF]
Frontiers in Oncology, 2021 PurposeThe difference in anatomical structure and positioning between planning and treatment may lead to bias in electronic portal image device (EPID)-based in vivo dosimetry calculations. The purpose of this study was to use daily CT instead of planning
Bin Feng +20 more
doaj +3 more sources
Improving patient treatment accuracy using transit dosimetry with Electronic Portal Imaging Device images and deep learning [PDF]
Physics and Imaging in Radiation OncologyBackground and Purpose:: Electronic portal imaging devices (EPID) can be utilized for transit in vivo dosimetry (IVD). A major limitation of standard amorphous Silicon EPID detectors for usage IVD is their non-linear detector response to water equivalent
Lorenzo Marini +9 more
doaj +2 more sources
A convolutional neural network model for EPID-based non-transit dosimetry. [PDF]
J Appl Clin Med Phys, 2023 AbstractPurposeTo develop an alternative computational approach for EPID‐based non‐transit dosimetry using a convolutional neural network model.MethodA U‐net followed by a non‐trainable layer named True Dose Modulation recovering the spatialized information was developed.
Bosco LD +5 more
europepmc +5 more sources
Physics and Imaging in Radiation Oncology, 2020 Background and purpose: First reports on clinical use of commercially automated systems for Electronic Portal Imaging Device (EPID)-based dosimetry in radiotherapy showed the capability to detect important changes in patient setup, anatomy and external ...
Dirk Verellen, Daan Nevens, Evy Bossuyt
exaly +3 more sources
Physics and Imaging in Radiation Oncology, 2023 Background and Purpose: Currently in-vivo dosimetry (IVD) is primarily used to identify individual patient errors in radiotherapy. This study investigated possible correlations of observed trends in transit IVD results, with adaptations to the clinical ...
Dirk Verellen, Daan Nevens, Evy Bossuyt
exaly +3 more sources
In-vivo dosimetry using electronic portal imaging in online-adaptive radiotherapy for rectal cancer [PDF]
Physics and Imaging in Radiation OncologyBackground and purpose: Electronic portal imaging device (EPID)-based in-vivo dosimetry (IVD) is widely used to verify radiotherapy dose delivery and detect deviations from anatomical changes, setup uncertainties, or machine-related errors. However, cone-
Gary Razinskas +7 more
doaj +2 more sources
A component-wise commissioning and validation framework for non-transit electronic portal imaging device patient-specific quality assurance [PDF]
Physics and Imaging in Radiation OncologyBackground and purpose: The American Association of Physicists in Medicine Task Group 307 (AAPM TG-307) recommends validation of electronic portal imaging device (EPID) patient-specific quality assurance (PSQA), including verification of measured and ...
Leyla Moghaddasi +7 more
doaj +2 more sources
Implementation and evaluation of a transit dosimetry system for treatment verification [PDF]
Physica Medica, 2016 To evaluate a formalism for transit dosimetry using a phantom study and prospectively evaluate the protocol on a patient population undergoing 3D conformal radiotherapy.Amorphous silicon EPIDs were calibrated for dose and used to acquire images of delivered fields.
Ricketts, K +10 more
exaly +4 more sources
A collapsed-cone based transit EPID dosimetry method
Physica Medica, 2018 To develop a transit-dose portal dosimetry method based on a commercial collapsed-cone algorithm.A Varian Clinac21EX (Varian Medical Systems, USA), equipped with an amorphous-silicon EPID aS1000, was used. Dose calculations were performed with the collapsed-cone algorithm of Pinnacle3 v8.0 m (Philips Medical Systems, USA).
Jaime Martínez Ortega
exaly +4 more sources
Validation of an in vivo transit dosimetry algorithm using Monte Carlo simulations and ionization chamber measurements [PDF]
Journal of Applied Clinical Medical PhysicsMarcelino Hermida López
exaly +2 more sources