AbstractIntroduction Silicone gel breast implants are used for breast reconstruction post mastectomy. In the event of cancer recurrence, the radiation oncologists are forced to irradiate through the prosthesis device. Due to prosthesis higher atomic number dose perturbations occur during treatment. This study determined the influence of silicone gel thickness on the photon beam distribution. Ma...

Background: Radiation-induced lung injury is a refractory side effect in lung cancer radiotherapy, the mechanism still remains unclear, hence an appropriate animal mode may become useful to investigate it. Materials and Methods: 50 female Wistar rats were randomly divided into 5 groups, average 10 rats/cage: A. control group B. 3Gy×10f C. 6Gy×5f D. 12.5Gy×1f E.15.3Gy×1f....

Reaksi pasar modal dalam bentuk Abnormal return dan Trading Volume Activity diuji apakah berpengaruh terhadap diumumkannya PPKM untuk kasus Delta Omicron COVID-19, perusahaan LQ 45 yang listed di BEI tahun 2021 (akasus Delta) 2022 (kasus Omicron), dengan periode pengamatan 5 hari sebelum pengumuman setelah Omicron. Untuk variable sebagai perwakilan reaksi keduanya tidak terlalu oleh Presiden RI...

Introduction: Protecting the vital organs in radiation therapy is one of the most important issues. Cerrobend alloy, the most common material used as the shield, is melted several times and used for different patients. In this study changes in attenuation coefficient of cerrobend due to melting was investigated.   Materials and Methods: In melting furnace, ...

Introduction: The aim of this study is evaluation of two Quality Assurance methods in sliding window IMRT technique and Determination of gamma index in both methods   Materials and Methods: In this study two tools named" Delta4" phantom and " Epiqa" software has been used to perform QA on the treatment plan before the actual treatment by Varian linear acceler...

Background: Physical wedges are still widely used as beam modifiers in external beam radiotherapy. However the presence of them in the beam trace may cause beam hardening which may not be considered in many treatment planning systems. The aim of this study is to investigate the beam hardening effect generated by physical wedges via different beam quality indexes as photon spectrum, half value l...

Monte Carlo simulation of linear accelerators (linacs) depends on the accurate geometrical description of the linac head. The geometry of the Varian TrueBeam linac is not available to researchers. Instead, the company distributes phase-space files of the flattening-filter-free (FFF) beams tallied at a plane located just upstream of the jaws. Yet, Monte Carlo simulations based on third-party tal...

Virus penyebab COVID-19, SARS-CoV-2 terus mengalami mutasi membentuk varian baru. Varian terbaru yang telah terdeteksi, yaitu Omicron dikenal sebagai B.1.1.529.(1) ini pertama kali dilaporkan di Afrika Selatan pada tanggal 24 November 2021 dan saat menyebar ke seluruh dunia.(1,2)