introduction one of the best methods in the diagnosis and control of breast cancer is mammography. the importance of mammography is directly related to its value in the detection of breast cancer in the early stages, which leads to a more effective treatment. the purpose of this article was to calculate the x-ray spectrum in a mammography system with monte carlo codes, including mcnpx and mcnp5...

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...

BACKGROUND Different target-filter combinations in computed radiography have different impacts on the dose and image quality in digital radiography. This study aims to evaluate the mean glandular dose (MGD) and modulation transfer function (MTF) of various target-filter combinations by investigating the signal intensities of X-ray beams. METHODS General Electric (GE) Senographe DMR Plus mammo...

This study aimed to investigate the energy dependence and the angular dependence of commercially available optically stimulated luminescence (OSL) point dosimeters in the mammography energy range. The energy dependence was evaluated to calculate calibration factors (CFs). The half-value layer range was 0.31-0.60 mmAl (Mo/Mo 22-28 kV, Mo/Rh 28-32 kV, and W/Rh 30-34 kV at 2-kV intervals). Mo/Rh 2...

PURPOSE To investigate the factors affecting the mammographic breast dose. MATERIALS AND METHODS The assessment was done on 622 qualified mammograms obtained with use of "variable kV" technique, i. e., semiautomatic mode, in screen-film mammography. Actual breast doses were calculated and analyzed to determine the roles of two screens and three films, two anode/filter selections (Mo/Mo and Mo...

Context: Medical imaging has a wide range of applications in today’s society. Basic projectional radiography, CT scans, mammograms and other advanced technologies all use x-rays to create large number examinations every day across the world. The most essential component such medical equipment is x-ray tube, which creates produces x-rays. Objective: We describe investigate an abstract model-geom...

PURPOSE To assess variations of glandular doses for a group of patients when different dose modes are selected for a specific system. MATERIALS AND METHODS All measurements were obtained with a Senographe DMR mammography unit (GE Medical Systems). Automatic exposure control with either contrast or standard mode was routinely used in patient examinations. Entrance surface air kerma (ESAK) valu...

Digital mammography requires revisiting techniques that have been optimized for prior screen/film mammography systems. The objective of the study was to determine optimized radiographic technique for a digital mammography system and demonstrate the potential for dose reduction in comparison to the clinically established techniques based on screen- film. An objective figure of merit (FOM) was em...

Pesawat mamografi merupakan alat yang digunakan pada kegiatan skrining payudara, sehingga dosis radiasi diterima payudara atau Mean Glandular Dose (MGD) perlu diperhatikan. Penelitian ini menggunakan pesawat dengan anoda berbahan Molybdenum ( Mo ) dan filter bahan Rhodium Rh ). dilakukan tujuan untuk mendapatkan nilai MGD dari setiap penggunaan tegangan tabung kombinasi Mo/Mo Mo/Rh serta memban...

0039-6028/$ see front matter 2009 Elsevier B.V. A doi:10.1016/j.susc.2009.07.045 * Corresponding author. Address: Reaction Kinetic tute of Nanochemistry and Catalysis, Chemical Resea Academy of Sciences, P.O. Box 168, H-6701 Szeged, H fax: +36 62 420 678. E-mail address: [email protected] (J. Kiss). The investigation of Rh, Mo and Rh–Mo nanosized clusters formed by physical vapor depositio...