BACKGROUND The aim of this study was to evaluate the performance of a commercial knowledge-based planning system, in volumetric modulated arc therapy for prostate cancer at multiple radiation therapy departments. METHODS In each institute, > 20 cases were assessed. For the knowledge-based planning, the estimated dose (ED) based on geometric and dosimetric information of plans was generated in...

background: to suggest south india ct diagnostic reference levels (drls) by collecting radiation doses for the most commonly performed ct examinations. materials and methods: a pilot study investigated the most frequent ct examinations. 110 ct sites were asked to complete a survey booklet to allow the recording of ct parameters for each of 3 ct examinations during a 1 year time period. dose dat...

It has been well known that nuclear power plant and coal-fired release some amount of radioactive materials during their normal operations. The purpose this study was to compare radiation exposure doses the public as a consequence airborne effluents released from plants under operation. NRCDose3 used estimate gaseous its operation while CAP88-PC calculate living around plant. results showed wer...

Abstract Purpose Phantom studies in CT emphysema quantification show that iterative reconstruction and deep learning-based noise reduction (DLNR) allow lower radiation dose. We compared on ultra-low-dose (ULDCT) with without reduction, to standard-dose (SDCT) chronic obstructive pulmonary disease (COPD). Method Forty-nine COPD patients underwent ULDCT (third generation dual-source CT; 70ref-mAs...

The commercial used the 555 single timer and 741 operational amplifiers (op-amp) were investigated under gamma-ray radiation of Co-60 source. maximum total doses 2 kGy 4 to irradiate. abnormal behavior in circuit frequency was observed, which decreased from 202 195 Hz at 744 Gy radiations. In op-amp circuit, output signal dropped 1.28 1.25 same dose. loss amplitude calculated about 2.3 % when d...

introduction: coronary angiography and angioplasty procedures lead to significant radiation exposure of patients. in the current study, the average radiation dose to patients during angiography in the angiography department of shahid-madani hospital was determined. materials and methods: an image intensifier based angiography unit (philips bh 3000) was used for angiography procedures. the accur...

introduction: in 2000, the unscear reported that ct constitutes 5% of all the medical x-ray  examinations and it contributes 34% of the resultant collective dose worldwide. children are more  sensitive to the ionizing radiations than adults. so, routine quality control tests are expected to be  carried out periodically on the ct scanners. the aim of this research was to estimate the effective  ...

a lithium borate thermoluminescence dosimeter with 0.3 wt% of manganese impurityconcentration was prepared for high dose levels in the range of 1-30 kgy for gamma irradiation applications.the tld reader was used for read out purposes from ambient temperature to about 400°c with a heating rate of 6°c/sec. the pre- and post- irradiation anneal temperature was 300°c for 1.5 and 1 hours respectivel...