Computed tomography (CT) has had a massive impact on diagnostic radiology over the past few decades. Serious concerns exist because of increase in effective radiation dose associated with CT scans, which could pose significant health risks. In CT, can be estimated by Monte Carlo simulations. The aim study was to estimate and compare doses for from organ dose-based calculations using tissue weig...

Dose distribution inside the human body due to external photon exposure was measured. Radiation detectors were imaging plate (IP) sheets and thermoluminescent dosimeters (TLD). Each IP sheet was installed between horizontally sliced pieces of a rando-phantom. TLDs were also installed inside/around the position of a target organ of the phantom. The rando-phantom was exposed to a photon beam of C...

Introduction Organ-based tube current modulation (OBTCM) is designed for anterior dose reduction in Computed Tomography (CT). The purpose was to assess capability chest CT using three organ systems at different kVp settings. Furthermore, noise, diagnostic image quality and tumour detection assessed. Methods A Lungman phantom scanned with without OBTCM 80–135/140 scanners; Canon Aquillion Prime,...

Introduction Gallium-67 ( 67 Ga) has been used as a radionuclide for imaging a variety of solid tumors since 1969. Since then use of various gallium-based radiotracers has been reported. Recently, 67 Ga-labeled acetylacetate bis(thiosemicarbazones) ( 67 Ga-AATS) complex with significant tumor accumulation and fast blood clearance has been employed. Materials and Methods In this study, the absor...

Dose reconstruction is a comprehensive analysis of the exposure received by individuals in the vicinity of facilities that release contaminants to the environment (i.e., real doses to real people).Performing dose reconstruction analyses which are extremely important elements for improving efficiency in radiological emergencies and accidents have been studied in this paper. For dose reconstructi...

New mathematical phantoms based on medical image data are allowing evaluation of internal and external dose calculations using better anatomic realism and inclusion of organs that were not previously defined. In this work, we show preliminary data for new radiation dose estimates for radiopharmaceuticals and CT examinations, using Monte Carlo radiation simulation routines developed in the Geant...

PURPOSE We aimed to determine the effective dose given to patients during neuroradiological C-arm computed tomography (CT) procedures. MATERIALS AND METHODS Measurements were performed on 48 patients using a dose-area product (DAP) meter. A PC-based Monte Carlo program (PCXMC, STUK, Helsinki, Finland) was used to calculate the effective dose from the DAP values of each patient. Organ doses we...

Introduction: Nowadays ionizing radiation has a considerable contribution in medical diagnostic and treatment. Using ionizing radiation is increasing rapidly, so biological effects of ionizing radiation should be considered more. X-rays in the range of diagnostic radiology have hazardous effects and risks that are defined as random effects. These effects obey the LNT hypothesis that occur at lo...