background: induction of radioadaptive responses in cells pretreated with a low dose radiation before exposure to a high dose is well documented by many investigators. the aim of this study is to determine the frequency of chromosomal aberration in peripheral blood lymphocytes of patients treated by radioiodine (131i) for hyperthyroidism, with or without previous thyroid scan with 99mtc. materi...

objective: investigating some biological side effects of radiations resulted from fusion reaction experiments in damavad tokamak. materials and methods: the absorbed dose of the personnel in damavand tokamak was measured using lif dosimeters and analyzed. results: in damavand in areas near the forbidden zone around this device the level of the received dose is very high (more than 6 msv for eac...

Abstract Background To quantify the amount of scattered radiation reaching breasts during x-ray and CT investigations head in order to find appropriate justification for an intended change practice involving torso shielding. Results Scattered from reached both procedures. The range mean dose were (CR 1.02–3.61/1.94 ± 0.63 mGy) (CT 2.20–8.50/3.74 2.28 mGy). Both had enormous difference CR (72.3%...

introduction accurate estimation of the absorbed dose in radiosensitive organs, located away from the target volume during radiotherapy, is one of the main reasons for the development of reference phantoms. the international commission on radiological protection (icrp) reference phantoms can provide a more realistic view of the human anatomy in comparison with the previously used mathematical p...

PURPOSE Evaluation of 15,000 computed tomography (CT) examinations to investigate if iterative reconstruction (IR) reduces sustainably radiation exposure. METHOD AND MATERIALS Information from 15,000 CT examinations was collected, including all aspects of the exams such as scan parameter, patient information, and reconstruction instructions. The examinations were acquired between January 2010...

BACKGROUND Computed Tomography (CT) contributes up to 50% of the medical exposure to the United States population. Children are considered to be at higher risk of developing radiation-induced tumors due to the young age of exposure and increased tissue radiosensitivity. Organ dose estimation is essential for pediatric and adult patient cancer risk assessment. The objective of this study is to v...

Introduction Accurate estimation of the absorbed dose in radiosensitive organs, located away from the target volume during radiotherapy, is one of the main reasons for the development of reference phantoms. The International Commission on Radiological Protection (ICRP) reference phantoms can provide a more realistic view of the human anatomy in comparison with the previously used mathematical p...