KEYWORDS: Breast, Digital breast tomosynthesis, Polymethylmethacrylate, Mammography, X-rays, Digital mammography, Breast cancer, Sensors, Imaging systems, Tissues
The objective of this work is to present the results for quality control tests applied to projection images acquisition in digital mammography and breast tomosynthesis (DBT). Mean glandular doses (MGD) were measured for the examination of series of women and for breast-simulating polymethyl methacrylate phantoms, thus assessing the suitability of the phantoms used for dosimetry in 2D mammography for DBT dosimetry. Moreover, X-ray tube output and half value layer measurements for MGD estimation using phantoms are also presented. Three different mammography/DBT systems were considered in this work: Hologic Selenia Dimensions, General Electric Senoclaire and Pristina and Siemens Inspiration. The results obtained for the different projections were compared with the 2D acquisitions and the differences between the two image modalities were compared.
Linear morphea is a disease that affects the subcutaneous tissue and the skin generating its hardening due to the excess of collagen production, causing joint contracture that can involve muscle and bone preventing the growth of the affected limb. This study analyzes the gait of a 13-year-old patient who was diagnosed with this pathology, a biomechanical analysis was performed using baropodometric tests and gait analysis. For this, conventional tests were carried out using specialized sensors, how the test results were designed and the development of an orthotic support device, as an actuator to improve the patient's condition. Subsequently, the use of the device in the patient was implemented to evaluate its effectiveness by comparing the tests performed before and after use. It was identified that improves the quality of the patient gait and in the parameters such as the distribution of body weight and its stability.
In this study we analyze the impact of new x-ray beam spectra on the mean glandular doses (MGD) delivered by a digital breast tomosynthesis system. The new polyenergetic spectra are generated with a rhodium (Rh) target and a 30 μm silver (Ag) filter. To evaluate the influence of the new spectra on patient doses, we compare the MGD values with those delivered with a regular Rh/Rh target/filter combination. Individual glandularity (%) of the patients in the study was estimated using the commercial software Volpara. Median of MGD values for CC and MLO views are around 38% and 46% lower with the Rh/Ag combination than with the Rh/Rh combination. Results suggest that the new spectra, with reduced dose properties, could be very useful in breast cancer screening programs.
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