Phase retrieval for X-ray in-line phase contrast imaging

Scattarella, F. and Tangaro, S. and Giannini, C. and Gargano, G. and Bellotti, R. (2011) Phase retrieval for X-ray in-line phase contrast imaging. Il nuovo cimento C, 34 (1). pp. 25-35. ISSN 1826-9885

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A review article about phase retrieval problem in X-ray phase contrast imaging is presented. A simple theoretical framework of Fresnel diffraction imaging by X-rays is introduced. A review of the most important methods for phase retrieval in free-propagation–based X-ray imaging and a new method developed by our collaboration are shown. The proposed algorithm, Combined Mixed Approach (CMA) is based on a mixed transfer function and transport of intensity approach, and it requires at most an initial approximate estimate of the average phase shift introduced by the object as prior knowledge. The accuracy with which this initial estimate is known determines the convergence speed of the algorithm. The new proposed algorithm is based on the retrieval of both the object phase and its complex conjugate. The results obtained by the algorithm on simulated data have shown that the obtained reconstructed phase maps are characterized by particularly low normalized mean square errors. The algorithm was also tested on noisy experimental phase contrast data, showing a good efficiency in recovering phase information and enhancing the visibility of details inside soft tissues.

Item Type: Article
Uncontrolled Keywords: Imaging and optical processing ; Phase retrieval ; Image forming and processing
Subjects: 500 Scienze naturali e Matematica > 530 Fisica
Depositing User: Marina Spanti
Date Deposited: 03 Apr 2020 15:09
Last Modified: 03 Apr 2020 15:09

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