Papers by sima Taghizadeh
Eastern Mediterranean Health Journal, 2016
This study aimed to find the association between job satisfaction and radiation protection knowle... more This study aimed to find the association between job satisfaction and radiation protection knowledge, attitude and practice of medical radiation workers occupationally exposed to ionizing radiation. In this crosssectional study, 530 radiation workers affiliated to Tehran University of Medical Sciences completed a knowledge, attitude and practice questionnaire on protecting themselves against radiation and Job Descriptive Index as a job satisfaction measure during May to November 2014. Opportunities for promotion (84.2%) and payment (91.5%) were the most important factors for dissatisfaction. Radiation workers who were married, had more positive attitudes toward protecting themselves against radiation, and had higher level of education accounted for 15.8% of the total variance in predicting job satisfaction. In conclusion, medical radiation workers with a more positive attitude toward self-protection against radiation were more satisfied with their jobs. In radiation environments, improving staff attitudes toward their safety may be considered as a key strategy to increase job satisfaction.
A new phantom for performance evaluation of bone mineral densitometry using DEXA and QCT
2011 IEEE Nuclear Science Symposium Conference Record, 2011
Accurate performance assessment of bone mineral density (BMD) methods is crucial due to the fact ... more Accurate performance assessment of bone mineral density (BMD) methods is crucial due to the fact that a high level of exact estimation of bone situation is needed for correct diagnosis. Variation of parameters like sensitivity and error ratio highly affects the densitometry results that may induce some level of uncertainty in diagnosis. So, designing an algorithm for correction is necessary
BACKGROUND: Medical radiation workers are potentially at a risk of unwanted ionizing radiation ex... more BACKGROUND: Medical radiation workers are potentially at a risk of unwanted ionizing radiation exposures. This study assessed the radiation protection knowledge, attitude, and practice (RP-KAP) of health-care workers who are occupationally exposed to radiation regarding protecting themselves from radiation.
accurate performance assessment of bone mineral densitometry is crucial due to the fact a high le... more accurate performance assessment of bone mineral densitometry is crucial due to the fact a high level of exact estimation of bone situation is needed for correct diagnosis of patient with bone disease. Variation of parameters like sensitivity and percentage error which highly affect the densitometry results may induce some level of uncertainty in diagnosis procedure. So, determination of this variation and designing an algorithm for correction is necessary to assure examiners about measurement results. In this study some phantoms consisting of soft tissue-and bone-equivalent material was devised to accurately test bone densitometry systems. It should be noted that there is no unique phantom to be able to use for simulations evaluation of both DEXA and QCT, this is the main background of this study which aim to design a completed phantom. Four inserts in spine phantom with precisely wide range of K 2 HPO 4 simulate trabecular bone, and provide the basis for the accurately check of bone densitometry systems. It has shown, although a linear correlation between measured and true density can be observed but, there is a variation in sensitivity and percentage error when density of spine changes. To correct and stabilize the sensitivity variation, an analytical algorithm is proposed.
Accurate performance assessment of bone mineral density (BMD) methods is crucial due to the fact ... more Accurate performance assessment of bone mineral density (BMD) methods is crucial due to the fact that a high level of exact estimation of bone situation is needed for correct diagnosis. Variation of parameters like sensitivity and error ratio highly affects the densitometry results that may induce some level of uncertainty in diagnosis. So, designing an algorithm for correction is necessary to assure examiners about measurement results. In this study several phantoms consisting of soft tissueand bone-equivalent material were devised to accurately test bone densitometry systems. It should be noted that to the best of our knowledge there is no unique phantom to be able to use for evaluation of both Dual Energy X-ray Absorptiometry (DEXA) and Quantitative Computed Tomography (QCT). The main motivation of this study was to design a reliable and easy to use phantom. A QCT quality control, quality assurance, and Plexiglas cylindrical phantoms as a spine phantom were designed and constructed to assess different bone densities. Four inserts in spine phantom with precisely wide range of K 2 HPO 4 solutions were used for simulation of bone tissues and to determine the BMD systems characteristics. The designed phantoms were also used for performance assessment of BMD systems. In this research it is demonstrated that by decreasing of bone mineral densities an increasing trend in error ratio of measured densities and declining trend in methods sensitivities were observed, that may cause some level of uncertainty in low densities.
accurate performance assessment of bone mineral densitometry is crucial due to the fact a high le... more accurate performance assessment of bone mineral densitometry is crucial due to the fact a high level of exact estimation of bone situation is needed for correct diagnosis of patient with bone disease. Variation of parameters like sensitivity and percentage error which highly affect the densitometry results may induce some level of uncertainty in diagnosis procedure. So, determination of this variation and designing an algorithm for correction is necessary to assure examiners about measurement results. In this study some phantoms consisting of soft tissue-and bone-equivalent material was devised to accurately test bone densitometry systems. It should be noted that there is no unique phantom to be able to use for simulations evaluation of both DEXA and QCT, this is the main background of this study which aim to design a completed phantom. Four inserts in spine phantom with precisely wide range of K 2 HPO 4 simulate trabecular bone, and provide the basis for the accurately check of bone densitometry systems. It has shown, although a linear correlation between measured and true density can be observed but, there is a variation in sensitivity and percentage error when density of spine changes. To correct and stabilize the sensitivity variation, an analytical algorithm is proposed.
accurate performance assessment of bone mineral densitometry is crucial due to the fact a high le... more accurate performance assessment of bone mineral densitometry is crucial due to the fact a high level of exact estimation of bone situation is needed for correct diagnosis of patient with bone disease. Variation of parameters like sensitivity and percentage error which highly affect the densitometry results may induce some level of uncertainty in diagnosis procedure. So, determination of this variation and designing an algorithm for correction is necessary to assure examiners about measurement results. In this study some phantoms consisting of soft tissue-and bone-equivalent material was devised to accurately test bone densitometry systems. It should be noted that there is no unique phantom to be able to use for simulations evaluation of both DEXA and QCT, this is the main background of this study which aim to design a completed phantom. Four inserts in spine phantom with precisely wide range of K 2 HPO 4 simulate trabecular bone, and provide the basis for the accurately check of bone densitometry systems. It has shown, although a linear correlation between measured and true density can be observed but, there is a variation in sensitivity and percentage error when density of spine changes. To correct and stabilize the sensitivity variation, an analytical algorithm is proposed.
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Papers by sima Taghizadeh