Abstract: To date, COVID-19 has mutated into several types or variants. The variants of this virus, Delta and Omicron, become noticable spread in all ages including children worldwide. Therefore, it is necessary to recognize the characteristics these two children. This study aimed determine Omicron was a literature review study, performed by using PubMed, Google Scholar ClinicalKey databases. r...

PURPOSE Describe the Radiological Physics Center's (RPC) extensive standard dosimetry data set determined from on-site audits measurements. METHOD AND MATERIALS Measurements were made during on-site audits to institutions participating in NCI funded cooperative clinical trials for 44 years using a 0.6cc cylindrical ionization chamber placed within the RPC's water tank. Measurements were made ...

Today, electronic portal imaging devices (EPIDs) are widely used as a replacement to portal films for patient position verification, but the image quality is not always optimal. The general aim of this study was to optimize the acquisition parameters of an amorphous silicon EPID commercially available for clinical use in radiation therapy with the view to avoid saturation of the system. Special...

PURPOSE To perform a quantitative study to verify that the mechanical field center coincides with the radiation field center when both are off from the isocenter during the single-isocenter technique in linear accelerator-based SRS/SBRT procedure to treat multiple lesions. METHODS We developed an innovative method to measure this accuracy, called the off-isocenter Winston-Lutz test, and here ...

This paper presents an alternative method to tune Monte Carlo electron beam parameters to match measured data using a minimal set of variables in order to reduce the model setup time prior to clinical implementation of the model. Monte Carlo calculations provide the possibility of a powerful treatment planning verification technique. The nonstandardized and nonautomated process of tuning the re...

The total skin irradiation (TSI) is one of the most efficient techniques in the treatment administered with curative intent of the cutaneous T-cell lymphoma (mycosis fungoides). The cure may be obtained in 10% to 40% of the cases [13]. To irradiate all skin in an appropriate time of the machine, in most times, are used large electron fields with treatment distances about 3 meters. The original ...

PURPOSE Equivalent Square (ES) enables the calculation of many radiation quantities for rectangular treatment fields, based only on measurements from square fields. While it is widely applied in radiotherapy, its accuracy, especially for extremely elongated fields, still leaves room for improvement. In this study, we introduce a novel explicit ES formula based on Weighted Power Mean (WPM) funct...

Background/Aim. In the past two decades, we have witnessed emergence of new radiation therapy techniques, radiotherapy treatment planning system (TPS) with calculating algorithms for dosage calculation in a patient, units multislice computed tomography (CT) and image-guided delivery. The aim study was investigating significant difference dosimetric TPS relation to values obtained by measuring o...