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We compared metal artifact in X-ray digital tomosynthesis DT and modern computed tomography CT reconstruction to improve the image quality. We compared the images of a prosthetic phantom titanium and a contrast-detail phantom obtained by DT using conventional filtered backprojection FBP, metal artifact reduction MAR processing, and simultaneous iterative reconstruction technique SIRT methods and those obtained by CT using conventional FBP and adaptive statistical iterative reconstruction methods. The effectiveness of each method for enhancing the visibility of a prosthetic phantom was quantified in terms of the intensity profile and root mean square error, and the removal of ghosting artifacts was quantified in terms of the artifact spread function ASF. In addition, low contrast resolution was evaluated in terms of the contrast-to- noise ratio. Image error was smaller in the MAR DT images in the near in-focus-plane, and the intensity profiles revealed the beam hardening effect. Streak artifacts were reduced in the SIRT DT and adaptive statistical iterative reconstruction CT images. The ASF performances of the algorithms were ranked in descending order: 1 MAR DT; 2 CT adaptive statistical iterative reconstruction, and conventional FBP; 3 SIRT DT; and 4 conventional FBP DT. The low contrast resolution was higher in the CT images than in the DT images. In conclusion, a review of the results revealed that the metal artifact reduction was highest for tomosynthesis with MAR processing, and the low contrast resolution performance was highest for CT.

KEYWORDS

Tomosynthesis; Computed Tomography; Prosthesis

Cite this paper

Gomi, T. 2013 Comparison of metal artifact in digital tomosynthesis and computed tomography for evaluation of phantoms. Journal of Biomedical Science and Engineering, 6, 722-731. doi: 10.4236-jbise.2013.67089.





Autor: Tsutomu Gomi

Fuente: http://www.scirp.org/



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