Scatter characterization using a beam-stop-array algorithm for digital breast tomosynthesis

Autor: Ye-Seul Kim, Hye-Suk Park, Jae-Gu Choi, Hee-Joung Kim, Young-Wook Choi
Rok vydání: 2013
Předmět:
Zdroj: Journal of the Korean Physical Society. 63:2239-2246
ISSN: 1976-8524
0374-4884
DOI: 10.3938/jkps.63.2239
Popis: Digital breast tomosynthesis (DBT) is a technique developed to overcome the limitations of conventional digital mammography by reconstructing slices through the breast from projections acquired at different angles from the X-ray source. In the development and the optimization of DBT, the X-ray scatter reduction technique remains a significant challenge due to projectiongeometry and radiation-dose concerns. The purpose of this study was to apply the scatter correction method, which estimates scatter patterns with a beam-stop-array (BSA) by spatial interpolation and obtains primary projections by subtracting the scatter patterns from raw detected projections. The DBT prototype is based on the CsI phosphor/Complementary metal-oxide-semiconductor flat panel detector, which was optimized for low exposures with rapid readout. A simplified beam-stop-array algorithm was used to estimate the scatter pattern for each projection and to obtain only primary projections. We evaluated the distribution of the scatter intensity by using a BSA algorithm and reconstructed breast images based on projections with and without a scatter correction. Comparing corrected and uncorrected slices, we measured the linear attenuation coefficient (LAC) over a breast phantom. These quantitative comparisons indicated improved image quality in terms of contrast, background noise and contrast-to-noise ratio.
Databáze: OpenAIRE
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