Background: Methods for segmentation, i.e., Full-segmentation (FS) and Segmentation-rotation (SR), are proposed maintaining Computed Tomography (CT) number linearity. However, their effectiveness has not yet been tested against noise.Objective: This study aimed to evaluate the influence of noise on accuracy CT linearity FS SR methods American College Radiology (ACR) computational phantoms.Mater...

Early stage oral cancer can be cured with oral brachytherapy, but whole-body radiation exposure status has not been previously studied. Recently, the International Commission on Radiological Protection Committee (ICRP) recommended the use of ICRP phantoms to estimate radiation exposure from external and internal radiation sources. In this study, we used a Monte Carlo simulation with ICRP phanto...

Annually, many people are irradiated for diagnostic and therapeutic purposes. Assessment of radiation dose and its related risks to patients are important issues in radiation protection dosimetry. The complex mathematical calculations of the absorbed and effective doses are now done with computers. The calculations are performed with the help of anthropomorphic computational models of human bod...

Today there exist two main approaches to developing computational phantoms for bone dosimetry. The first approach is based on a detailed description of the microarchitecture spongiosa filling phantoms. This includes trabeculae and marrow separately, i.e., source tissue detector are separated. second involves generating homogeneous where target tissues combined. In both cases simulation results ...

In computed tomography (CT), the noise is sometimes non-uniform, i.e. magnitude may vary with gradient level within image. The purpose of this study was to quantify non-uniformity in CT images using appropriate 1D and 2D computational phantoms, validate effectiveness proposed concept filtered by bilateral filter (BF), as an example a non-linear filter. We first developed Gaussian noises several...

PURPOSE To calculate organ S values (mGy∕Bq-s) and effective doses per time-integrated activity (mSv∕Bq-s) for pediatric and adult family members exposed to an adult male or female patient treated with I-131 using a series of hybrid computational phantoms coupled with a Monte Carlo radiation transport technique. METHODS A series of pediatric and adult hybrid computational phantoms were employ...