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Your search keyword '"V.S.M. Barros"' showing total 2 results
Start Over Author "V.S.M. Barros" Journal radiation protection dosimetry
2 results on '"V.S.M. Barros"'

1. The performance of commercial photodiodes for dosimetry in mammography

Author

V.S.M. Barros, E. Batista, E. F. da Silva, Helen J. Khoury, and F. A. Melo

Subjects
Materials science, Direct reading, Transducers, Risk Assessment, law.invention, Kerma, Radiation Protection, Optics, Risk Factors, law, medicine, Humans, Dosimetry, Mammography, Radiology, Nuclear Medicine and imaging, Radiometry, Radiation, Radiological and Ultrasound Technology, medicine.diagnostic_test, business.industry, Radiation dose, Public Health, Environmental and Occupational Health, Radiotherapy Dosage, Equipment Design, General Medicine, Anode, Photodiode, Equipment Failure Analysis, Semiconductors, Ionization chamber, Body Burden, business, Nuclear medicine, Relative Biological Effectiveness
Abstract

This paper reports the results of an investigation carried out to determine the suitability of using a commercially available photodiode for dosimetry in mammography thereby providing a low cost dosemeter with a direct reading of the radiation dose. A mammographic X-ray generator (Siemens Mammomat 1000) with tube potential in the 23-30 kV range and a constant potential X-ray generator (Pantak) with a W/Mo anode/filter combination were used in this study. The results showed that the photodiode response is highly linear within mammographic dose ranges and that the energy dependence was

Published
2005

2. Evaluation of patient dose for mammography in Pernambuco, Brazil

Author

V.S.M. Barros, C. Lopes, and Helen J. Khoury

Subjects
medicine.medical_specialty, Patients, Radiation Dosage, Models, Biological, Risk Assessment, Kerma, Radiation Protection, Risk Factors, medicine, Mammography, Humans, Radiology, Nuclear Medicine and imaging, Medical physics, Computer Simulation, Breast, Radiometry, Radiation, Radiological and Ultrasound Technology, medicine.diagnostic_test, Mammography procedures, business.industry, Public Health, Environmental and Occupational Health, General Medicine, Patient exposure, Breast phantom, Body Burden, Patient dose, Nuclear medicine, business, Brazil, Relative Biological Effectiveness
Abstract

The aim of this study is to evaluate the incident air kerma (INAK) and the mean glandular dose (MGD) during mammography in Recife, North-east Brazil. The study was performed in three institutions: a private clinic (A), a public hospital (B) and a private hospital (C). The incident air kerma to mammography procedures were estimated using a standard breast phantom and the patient MGD, evaluated in the units B and C, was performed using the calibration of output method. This method involves the recording of the patient exposure parameters (kVp, mAs, filter) and the measurement of these parameters of the incident air kerma using a calibrated ionisation chamber. The results obtained showed that INAK for the standard breast phantom, in the institutions A, B and C, were 18.2, 9.4 and 8.5 mGy, respectively. The results of patient MGD values ranged from 0.23 to 7.46 mGy per film, and the MGD values per woman were between 8.23 and 40.6 mGy for the C institution and between 1.50 and 18.78 mGy for the B institution.

Published
2005

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