This paper presents an overview of the x-ray guided robotic radiosurgery system that has been developed for the ablation of solid tumors. A robot mounted linear accelerator is directed through a sequence of positions and orientations designed to deliver high radiation dosages focussed at a specific location. Patient movement during treatment is identified by stereo x-ray measurements and the ro...

introduction quality control (qc) techniques are used in monitoring and maintenance of the components of an x-ray system. qc of radiology devices plays a significant role in reduction of medication dose and optimization of image quality. this study aimed to conduct qc tests on randomly selected radiology devices, installed in diagnostic imaging departments of iran. materials and methods in tota...

c M m ( m t C m o u e RATIONALE CT has become an invaluable diagnostic tool, and its use has surged dramatically over the past decade. However, one of its main disadvantages is the significant dose of ionizing radiation required compared with other imaging modalities, such as ultrasound and MR. Increasing concern among both health care professionals and the public regarding the long-term carcin...

Introduction: Diagnostic reference level (DRL) is a useful tool for the promotion of optimization. The national DRLs (NDRLs) are useful, brief, and robust guidelines for optimizing radiation protection in a country. The aim of this study was to extract the local DRLs (LDRLs) for some common radiologic examination in Sabzevar county. Materials and Methods: There are eight radiology departments ...

Introduction: Regular implementation of quality control (QC) program in diagnostic X-ray facilities may affect both image quality and patient radiation dose due to the changes in exposure parameters. Therefore, this study aimed to investigate the status of randomly selected conventional radiographic X-ray devices installed in radiology centers of Great Khorasan Province, Iran, to produce the da...

Background: It has recently been shown that the particle size of materials used for radiation shielding can affect the magnitude of radiation attenuation. Over the past years, application of nano-structured materials in radiation shielding has attracted attention world-wide. The purpose of this study was to investigate the shielding properties of the lead-free shields containing micro and nano-...

background: the use of the ionizing radiation in the medical practice has evolved since its beginnings. their benefit for the patient is considerable in term of comfort, diagnostic and therapeutic effectiveness. it is estimated that 30% to 50% of critical decisions in medical approaches is based on x-ray examination. using the x-ray as a diagnostic means by clinicians requires appropriate and a...

introduction the purpose of this study was to estimate organ and effective doses in patients undergoing some common x-ray examinations in sabzevar, iran. the effective dose is one of the best parameters for describing the amount of radiation dose received by a patient undergoing any diagnostic x-ray examination. the public dose from x-ray examinations depends on various factors, and its contrib...