A comparison between traditional shift-and-add (SAA) and point-by-point back projection (BP) -- relevance to morphology of microcalcifications for isocentric motion in Digital Breast tomosynthesis (DBT)

• Published in: 2007 IEEE 7th International Symposium on BioInformatics and BioEngineering Vol. 7; pp. 563 - 569
• Main Authors: Ying Chen, Lo, J.Y., Dobbins, J.T.
• Format: Conference Proceeding Journal Article
• Language: English
• Published: IEEE 01.01.2007
• Subjects: Back; Biomedical engineering; Breast cancer; Detectors; Humans; Image edge detection; Image reconstruction; Morphology; Transfer functions; X-ray imaging
• ISBN: 1424415098; 9781424415090
• DOI: 10.1109/BIBE.2007.4375617

Digital breast tomosynthesis (DBT) is a three-dimensional imaging technique providing an arbitrary set of reconstruction planes in the breast with limited series of projection images. This paper describes a comparison between traditional shift-and-add (SAA) and point-by-point back projection (BP) algorithms by impulse response and modulation transfer function (MTF) analysis. Due to the partial isocentric motion of the x-ray tube in DBT, structures such as microcalcifications appear slightly blurred in traditional shift-and-add (SAA) images in the direction perpendicular to the direction of tube's motion. Point-by-point BP improved rendition of microcalcifications. The sharpness and morphology of calcifications were improved in a human subject images. A filtered back projection (FBP) deblurring approach was used to demonstrate deblurred point-by-point BP tomosynthesis images. The point-by-point BP rather than traditional SAA should be considered as the foundation of further deblurring algorithms for DBT reconstruction.