Introduction Superficial X-ray therapy is one of the most important treatment methods in radiotherapy especially in the treatment of superficial skin lesions (Up to 300 kVp). Quality of the X-ray beam that can be expressed by Half-Value Layer (HVL), are important indices for this type of treatment effective energy of photon and Homogeneity Coefficient (HC). Materials and Methods The HC of the s...

PURPOSE Through the Monte Carlo (MC) simulation of 6 and 10 MV flattening-filter-free (FFF) beams from Varian TrueBeam accelerator, this study aims to find the best incident electron distribution for further studying the small field characteristics of these beams. METHODS By incorporating the training materials of Varian on the geometry and material parameters of TrueBeam Linac head, the 6 an...

In April 2005, a geometry package to implement almost arbitrary geometries was added to the EGSnrc code system: egspp (Kawrakow 2005 NRCC Report PIRS-899, Kawrakow and Rogers 2006 NRCC Report PIRS-701). During the use of this geometry package, some inconsistencies were found which might lead to dose values that are wrong by up to a factor of 100. In addition, discrepancies up to a factor of 3 w...

PURPOSE To design an efficient method for utilizing phase-space source models in the GPU-based Monte Carlo (MC) dose calculation engine gDPM. METHODS In GPU-based MC algorithms, particles are transported in parallel on different threads. Particles of different types and energies can require significantly different execution times. This can cause "thread divergence" and lower efficiency when s...

Metallic eye shields have been widely used for near-eye treatments to protect critical regions, but have never been incorporated into treatment plans because of the unwanted appearance of the metal artifacts on CT images. The purpose of this work was to test the use of an acrylic dummy eye shield as a substitute for a metallic eye shield during CT scans. An acrylic dummy shield of the same size...

New technologies in cancer radiotherapy need a more accurate computation of the dose delivered in the radiotherapeutical treatment plan, and it is important to integrate sophisticated mathematical models and advanced computing knowledge into the treatment planning (TP) process. We present some results about using Monte Carlo (MC) codes in dose calculation for treatment planning. A distributed c...

CyberKnife is one of multiple modalities for stereotactic radiosurgery (SRS). Due to the nature of CyberKnife and the characteristics of SRS, dose evaluation of the CyberKnife procedure is critical. A radiophotoluminescent glass dosimeter was used to verify the dose accuracy for the CyberKnife procedure and validate a viable dose verification system for CyberKnife treatment. A radiophotolumines...

In this work, organized as a short review, we present some results obtained by applying the Monte Carlo techniques in the Intra-Operative Radiation Therapy (IORT). The electron beams generated by the NOVAC7 IORT accelerator have been simulated using BEAMnrc/EGSnrc Monte Carlo code, the dose distributions and water-to-air stopping power ratios being later calculated with the associated software ...

Nghiên cứu này áp dụng phương pháp mô phỏng Monte Carlo Mã EGSnrc với hai mã là chuyên dụng, BEAMnrc được sử để chùm tia phát ra từ đầu máy gia tốc và DOSXYZnrc tính toán liều lượng tốc. Từ đó, đánh giá sự suy giảm của bức xạ qua các lớp vật liệu che chắn. Kết quả nghiên ban cho thấy giới hạn ở khu vực nhân viên (khu Kiểm soát) 0,11 mSv / tuần (5,5 năm) công cộng Không kiểm 0,022 (1,1 ).

Introduction: One of the treatment choices in breast cancer is Intra operative electron beam radiation therapy (IOERT). Due to high dose delivery in this procedure, shielding disk is used to protect organs at risk (OARs). In this study, we evaluate the OARs dose in the breast IOERT using Monte Carlo simulation with and without shielding disk in RANDO phantom. Material and Methods: Simulation ...