نتایج جستجو برای: mean glandular dose

تعداد نتایج: 871785  

Introduction: Average glandular dose calculation in mammography with Mo-Rh target-filter and dose calculation for different situations is accurate and fast. Material and Methods: In this research, first of all, x-ray spectra of a Mo target bombarded by a 28 keV electron beam with and without a Rh filter were calculated using the MCNP code. Then, we used the Sobol-Wu parameters to write a FORTRA...

Journal: :International Journal of Scientific Research in Science and Technology 2021

2014
Bruno Beraldo Oliveira Marcio Alves de Oliveira Lucas Paixão Maria Helena Araújo Teixeira Maria do Socorro Nogueira

OBJECTIVE To evaluate the mean glandular dose with a solid state detector and the image quality in a direct radiography system, utilizing phantoms. MATERIALS AND METHODS Irradiations were performed with automatic exposure control and polymethyl methacrylate slabs with different thicknesses to calculate glandular dose values. The image quality was evaluated by means of the structures visualize...

Journal: :iranian journal of medical physics 0
ali asghar mowlavi associate professor, physics dept., school of sciences, sabzevar tarbiat moallem university, sabzevar, iran.

introduction: average glandular dose calculation in mammography with mo-rh target-filter and dose calculation for different situations is accurate and fast. material and methods: in this research, first of all, x-ray spectra of a mo target bombarded by a 28 kev electron beam with and without a rh filter were calculated using the mcnp code. then, we used the sobol-wu parameters to write a fortra...

2012
Mariela A. Porras-Chaverri John R. Vetter Ralph Highnam

A methodology for patient-oriented calculations of mean glandular dose (MGD) is introduced in this study. The method takes into consideration the influence of the glandular tissue distribution in the MGD. The glandular tissue information was estimated from conventional mammography images using breast density assessment software followed by the Mammography-Image Based (MIB) method presented in t...

Journal: :Physics in medicine and biology 2005
J T M Jansen W J H Veldkamp M A O Thijssen S van Woudenberg J Zoetelief

The nationwide breast cancer screening programme using mammography has been in full operation in the Netherlands since 1997. Quality control of the screening programme has been assigned to the National Expert and Training Centre for Breast Cancer Screening. Limits are set to the mean glandular dose and the centre monitors these for all facilities engaged in the screening programme. This procedu...

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