Effect of target/filter combination on the mean glandular dose and contrast-detail threshold: A phantom study
| Autor: | R.S. Nunes, W.O. Batista |
|---|---|
| Rok vydání: | 2021 |
| Předmět: |
Digital mammography
Materials science medicine.diagnostic_test Phantoms Imaging Image quality media_common.quotation_subject Filter (signal processing) Imaging phantom 030218 nuclear medicine & medical imaging Radiographic Image Enhancement 03 medical and health sciences Kerma 0302 clinical medicine 030220 oncology & carcinogenesis medicine Humans Mammography Figure of merit Contrast (vision) Radiology Nuclear Medicine and imaging Breast Radiometry Biomedical engineering media_common |
| Zdroj: | Radiography. 27:272-278 |
| ISSN: | 1078-8174 |
| Popis: | Introduction In mammography it is essential to combine aspects of image quality with compliance with glandular dose levels. The objective of this study was to combine the assessment of the contrast-detail threshold and the mean glandular dose for different target/filter combinations in digital mammography and to indicate the optimal combination through a figure of merit (FOM). Methods In a direct digital mammograph, performance and image quality standards were evaluated using a solid-state multidetector capable of measuring various parameters including kerma and standardized phantoms for image quality. After verifying the proper functioning of the mammograph, the contrast-detail detection threshold and the mean glandular dose values for thicknesses ranging from 20 mm to 70 mm in polymethylmethacrylate (PMMA) were evaluated. Combining these values, an FOM was defined to determine the optimal combination. Results The results indicated that the Mo/Rh and W/Rh combinations present mean glandular doses below the limit for all thicknesses. In contrast, using the Mo/Mo combination, the mean glandular doses were below the limit only up to 45 mm. However, when considering the FOM that combines dosimetric aspects and the contrast-detail threshold, the use of W/Rh is the most optimal option. Conclusion The results obtained in this study demonstrate that the W/Rh combination in direct digital mammography is the option that presents the best trade-off between the mean glandular dose and the contrast-detail detection threshold. Implications for practice The results demonstrate that the application of the W/Rh combination in direct digital mammography offers an optimized and applicable option, regardless of the thickness of the breast that will be radiographed. |
| Databáze: | OpenAIRE |
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