Vasiliki Peppa
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View article: Validation of dose‐volume calculation accuracy for intracranial stereotactic radiosurgery with volumetric‐modulated arc therapy using analytical and clinical treatment plans
Validation of dose‐volume calculation accuracy for intracranial stereotactic radiosurgery with volumetric‐modulated arc therapy using analytical and clinical treatment plans Open
Background Stereotactic radiosurgery (SRS) poses challenges in calculating dose volume histograms (DVHs) due to the inherent spatial discretization uncertainties. Purpose To develop a procedure for quantifying discretization errors and ass…
View article: A hybrid dosimetry approach for remote audits in Ir-192 HDR interstitial brachytherapy: Development and pilot implementation
A hybrid dosimetry approach for remote audits in Ir-192 HDR interstitial brachytherapy: Development and pilot implementation Open
Purpose: This work presents the development and pilot implementation of a comprehensive remote dosimetry audit for Ir-192 High Dose Rate interstitial brachytherapy, integrating experimental and computational dosimetry procedures into a uni…
View article: Clinical test cases for model-based dose calculation algorithm commissioning, QA and benchmarking, for 192Ir HDR brachytherapy of gynecologic cancers
Clinical test cases for model-based dose calculation algorithm commissioning, QA and benchmarking, for 192Ir HDR brachytherapy of gynecologic cancers Open
Purpose: To develop clinically relevant test cases for commissioning Model-Based Dose Calculation Algorithms (MBDCAs) for 192Ir High Dose Rate (HDR) gynecologic brachytherapy following the workflow proposed by the TG-186 report and the WGD…
View article: Portal Imaging: The effect of scintillator thickness in the Electronic Portal Imaging Detector (EPID) Modulation Transfer Function (MTF). Is a large thickness always useful? The theoretical paradigm of Gd<sub>2</sub>O<sub>2</sub>S:Tb
Portal Imaging: The effect of scintillator thickness in the Electronic Portal Imaging Detector (EPID) Modulation Transfer Function (MTF). Is a large thickness always useful? The theoretical paradigm of Gd<sub>2</sub>O<sub>2</sub>S:Tb Open
Scintillator materials like Gd 2 O 2 S:Tb are used in radiotherapy Electronic Portal Imaging Systems (EPIDs) as part of the radiation detector apparatus. Considering the fact that EPID is used in patient position verification, tumor imagin…
View article: Suitability of a BeO-based OSLD system for end-to-end remote dosimetry tests in SRS/SRT applications
Suitability of a BeO-based OSLD system for end-to-end remote dosimetry tests in SRS/SRT applications Open
The evaluated OSLD system is suitable for end-to-end tests in SRS/SRT. This study can serve as an implementation guide in such applications.
View article: Institution-specific pre-treatment quality assurance control and specification limits: formalism, tools, and criteria optimization using statistical process control and heuristic methods
Institution-specific pre-treatment quality assurance control and specification limits: formalism, tools, and criteria optimization using statistical process control and heuristic methods Open
View article: Institution-specific pre-treatment quality assurance control and specification limits: formalism, tools, and criteria optimization using statistical process control and heuristic methods
Institution-specific pre-treatment quality assurance control and specification limits: formalism, tools, and criteria optimization using statistical process control and heuristic methods Open
View article: Beam quality correction factors for dose measurements around <sup>192</sup>Ir brachytherapy sources
Beam quality correction factors for dose measurements around <sup>192</sup>Ir brachytherapy sources Open
Purpose To provide beam quality correction factors () for detectors used in 192 Ir brachytherapy dosimetry measurements. Materials and Methods Ten detectors were studied, including the PTW 30013 and Exrading12 Farmer large cavity chambers,…
View article: Dose delivery uncertainties assessment in the field junction region of craniospinal irradiation with Volumetric Modulated Arc Therapy using a robustness index and experimental dose verification
Dose delivery uncertainties assessment in the field junction region of craniospinal irradiation with Volumetric Modulated Arc Therapy using a robustness index and experimental dose verification Open
Due to its inherent technical challenges, craniospinal irradiation (CSI) entails crucial considerations regarding plan complexity and robustness. The scope of this work was to establish and validate methods suitable for the evaluation of r…
View article: Image Quality and Information Parameters of Electronic Portal Imaging Devices
Image Quality and Information Parameters of Electronic Portal Imaging Devices Open
In this study, the imaging performance of electronic portal imaging devices (EPIDs) is evaluated, comparing measurements collected from EPID images captured at 115 cm, with a field size of 15 × 15 cm2, monitor units (MUs) in the range of 2…
View article: On the impact of improved dose calculation accuracy in clinical treatment planning for superficial high-dose-rate brachytherapy of extensive scalp lesions
On the impact of improved dose calculation accuracy in clinical treatment planning for superficial high-dose-rate brachytherapy of extensive scalp lesions Open
TG-43-based dose calculations disregard tissue heterogeneities and finite scatter conditions, prompting the introduction of model-based dose calculation algorithms (MBDCAs) to improve accuracy in high-dose-rate (HDR) brachytherapy. This st…
View article: A phantom based evaluation of the clinical imaging performance of electronic portal imaging devices
A phantom based evaluation of the clinical imaging performance of electronic portal imaging devices Open
View article: A MC‐based anthropomorphic test case for commissioning model‐based dose calculation in interstitial breast 192‐Ir HDR brachytherapy
A MC‐based anthropomorphic test case for commissioning model‐based dose calculation in interstitial breast 192‐Ir HDR brachytherapy Open
Purpose To provide the first clinical test case for commissioning of 192 Ir brachytherapy model‐based dose calculation algorithms (MBDCAs) according to the AAPM TG‐186 report workflow. Acquisition and Validation Methods A computational pat…
View article: IMAGE QUALITY IMPACT OF DIFFERENT PHOSPHOR ACTIVATOR MATERIALS IN Gd<sub>2</sub>O<sub>2</sub>S BASED EPID SYSTEMS
IMAGE QUALITY IMPACT OF DIFFERENT PHOSPHOR ACTIVATOR MATERIALS IN Gd<sub>2</sub>O<sub>2</sub>S BASED EPID SYSTEMS Open
In this work, the effect of the scintillator on EPIDs signal transfer properties was examined.Modulation Transfer Function, Signal Power Spectrum and Light Output were assessed by analytical models while radiation incidence was estimated b…
View article: TOWARDS THE IMPLEMENTATION OF A PHANTOM FOR THE LOW CONTRAST EVALUATION OF ELECTRONIC PORTAL IMAGING DETECTORS (EPID): A THEORETICAL STUDY
TOWARDS THE IMPLEMENTATION OF A PHANTOM FOR THE LOW CONTRAST EVALUATION OF ELECTRONIC PORTAL IMAGING DETECTORS (EPID): A THEORETICAL STUDY Open
Electronic Portal Imaging Systems (EPIDs) are used in Radiotherapy treatment as part of the patient positioning verification check and for portal dosimetry purposes.The quality control of the imaging performance of an EPID is performed wit…
View article: On the potential of 2D ion chamber arrays for high-dose rate remote afterloading brachytherapy quality assurance
On the potential of 2D ion chamber arrays for high-dose rate remote afterloading brachytherapy quality assurance Open
Objective . To investigate the potential of 2D ion chamber arrays to serve as a standalone tool for the verification of source strength, positioning and dwell time, within the framework of 192 Ir high-dose rate brachytherapy device quality…
View article: Comparison and Evaluation of Different Radiotherapy Techniques Using Biodosimetry Based on Cytogenetics
Comparison and Evaluation of Different Radiotherapy Techniques Using Biodosimetry Based on Cytogenetics Open
While rapid technological advances in radiotherapy techniques have led to a more precise delivery of radiation dose and to a decreased risk of side effects, there is still a need to evaluate the efficacy of the new techniques estimating th…
View article: Validation of a brain VMAT treatment through multi-detector dosimetry in an anthropomorphic phantom
Validation of a brain VMAT treatment through multi-detector dosimetry in an anthropomorphic phantom Open
View article: [P264] Time resolved dose rate distributions in radiosurgery and their impact on biological effectiveness of treatment
[P264] Time resolved dose rate distributions in radiosurgery and their impact on biological effectiveness of treatment Open