SPECIAL SECTION ON MODEL-BASED MEDICAL IMAGE PROCESSING AND ANALYSIS Tomography

Merging of orthogonally sampled projection sets as a means for eliminating correlation artifacts from tomograms

[+] Author Affiliations
Richard L. Webber

Wake Forest University School of Medicine, Departments of Dentistry and Medical Engineering, Division of Radiologic Sciences, Winston-Salem, North Carolina?27157-1093 E-mail: rwebber@wfubmc.edu

Alexander L. Berestov

Canon Development Americas, Inc, San Jose, California?95134

Jeffrey W. Duryea

Harvard Medical School, Department of Radiology, Brigham and Women’s Hospital, Boston, Massachusetts?02115

Frederic H. Fahey

Wake Forest University School of Medicine, Division of Radiologic Sciences, Winston-Salem, North Carolina?27157-1022

J. Electron. Imaging. 12(1), 25-30 (Jan 01, 2003). doi:10.1117/1.1526848
History: Received May 1, 2001; Revised Jan. 1, 2002; Accepted Jun. 1, 2002; Online January 29, 2003
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We explore the feasibility of merging independent data sets to mitigate volume anisotropy intrinsic to tomosynthetic reconstructions. Two independent sets of orthogonally oriented projection data are obtained, respectively, from a hand phantom and from frozen breast tissues. Both objects are enclosed within radiolucent containers containing multiple fiducial reference objects. The latter facilitates registration of multiple projections produced by incrementally moving the x-ray source relative to the object about a single axis through a fixed series of angles. These data encompass maximum angular disparities up to 90 deg for each projection series. The resulting data are projectively transformed and nonlinearly processed using tuned-aperture computed tomography to yield a number of contiguous slices equal to the linear resolution of the sampled projections measured in pixels. The resulting slice data are then corrected for differential magnification, appropriately rotated, and linearly merged to yield a relatively complete, volumetrically isotropic representation of the phantom that could be visualized from any desired angle with negligible apparent tomosynthetic distortion. The resulting displays are evaluated subjectively and compared quantitatively with control images produced from optimum projection geometries. The results are consistent with the hypothesis that volume anisotropy intrinsic to tomosynthetic reconstructions can be minimized through integration of contiguously sampled orthogonal projections. © 2003 SPIE and IS&T.

© 2003 SPIE and IS&T

Citation

Richard L. Webber ; Alexander L. Berestov ; Jeffrey W. Duryea and Frederic H. Fahey
"Merging of orthogonally sampled projection sets as a means for eliminating correlation artifacts from tomograms", J. Electron. Imaging. 12(1), 25-30 (Jan 01, 2003). ; http://dx.doi.org/10.1117/1.1526848


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