In this work, images of exams performed in Digital Breast Tomosynthesis (DBT) system were collected retrospectively from 660 Brazilian women, who underwent screening mammography in clinics located in three Brazilian geographic regions. The raw images were processed using the Volpara software, through which the volume and volumetric density of the breast, the contact area between the breast and the tray, the force and pressure of compression and the thickness of the compressed breast were determined. mean breast size was determined by Volpara, resulting in 737 cm3 . The compression force had a median of 79.5 N, with a range of 20 to 160 N and a compression pressure of 9.94 kPa, with a range of 2.6 to 29.5 kPa. The analysis of the correlation between the quantities resulted in percentage dense volume and volume with compression force, r = - 0.259 and r = 0.313, respectively (p < 0.01)), percentage dense volume and volume with compression pressure, r = 0.327 and r = -0.478 (p < 0.01), showing that when it is considered an intrinsic characteristic of the breast there is a greater possibility of standardizing compression through compression pressure instead of compression force.
KEYWORDS: Breast, Mammography, Digital breast tomosynthesis, Image compression, Breast cancer, Tissues, Image analysis, X-rays, Statistical analysis, Digital mammography
This study aims to verify the relationship of MGD between four different types of manufacturing mammograms and models and to verify patient characteristic factors and GDM. Using the Volpara software were analyzed a total of 7,000 3D and 2D images. From this analysis were obtained the breast volume density (DVB) and the MGD. Using the DICOM header of the image, we collected the patient's age and compressed breast thickness. The sample of patients presented a mean of 57 (±15) mm of compressed breast thickness(CBT) for the Hologic equipment (range from 19.82 to 100.75 mm) and the medians for the other variables were 51 years (range 25 to 87 years old), 1.75 mGy MGD (0.43 to 4.68 mGy range), and 7.61% DVB (2.16% to 36.89% range). The MGD for GE Senoclaire system and Hologic were higher compared the other evaluated tomosynthesis systems as also higher for MLO projection when compared to CC projection. The Siemens equipment was the system that gave the lowest dose in all breast thicknesses evaluated.
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.
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