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.
Mammography and tomosynthesis diagnostic techniques contribute to the patient dose and the estimation of the Mean Glandular Dose (MGD) for x-ray based imaging modalities forms an essential part of quality control (QC) and for system optimization. This study compares three solid‐state dosimeters (SStDs) and one thermoluminescence dosimeter (TLD) with a half value layer (HVL) measurements by ion chamber. These electronics SStDs instruments are very efficient in clinical practice. However, a specialized technician is required for its operation and the clinics do not have this instrumentation. Thus, the application of a TLD system becomes an important means for determining the MGD through the evaluation of Ka,i and HVL. For measurements used a Siemens Mammomat 3000 Nova mammography to evaluate the dosimetry systems. The three electronics SStDs detectors (Accu-Gold Radcal, Unfors RaySafe Xi and Piranha), TLD system and TRS457 table were compared with ion chamber results for HVL. The results showed that SStDs and TLD dosimeters have a flat HVL response under clinical conditions (less than 5%). However, the SStDs detectors tended to overestimate the measurements. However, all results were equivalent (p<0,05) for all HVL evalueted.
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