Journal ArticleDOI
Restoration of Digital Multiplane Tomosynthesis by a Constrained Iteration Method
TLDR
Although in practice the restoration process must be left incomplete because of inescapable noise and quantization artifacts, the experimental results demonstrate that for reasons of stability the convergence conditions derived for the noise-free, unconstrained case should be satisfied.Abstract:
Tomosynthetic reconstructions suffer from the disadvantage that blurred images of object detail lying outside the plane of interest are superimposed over the desired image of structures in the tomosynthetic plane. It is proposed to selectively reduce these undesired superimpositions by a constrained iterative restoration method, suitably generalized to permit simultaneous deconvolution of multiple planes. Sufficient conditions are derived ensuring the convergence of the iterations to the exact solution in the absence of noise and constraints. Although in practice the restoration process must be left incomplete because of inescapable noise and quantization artifacts, the experimental results demonstrate that for reasons of stability the convergence conditions derived for the noise-free, unconstrained case should be satisfied. In order to establish a basis for a formal stopping criterion of the iteration procedure, the buildup of noise in the sequence of iterative restorations arising from white noise in the original radiographs is investigated theoretically and experimentally. This results in the derivation of an approximation to the limiting noise variance in the reconstructions which is verified experimentally.read more
Citations
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Journal ArticleDOI
Digital x-ray tomosynthesis: current state of the art and clinical potential
TL;DR: The various reconstruction algorithms used to produce tomosynthesis images, as well as approaches used to minimize the residual blur from out-of-plane structures are described.
Journal ArticleDOI
A comparison of reconstruction algorithms for breast tomosynthesis.
TL;DR: It was shown in both phantom imaging and patient imaging that the BP algorithm provided the best SDNR for low-contrast masses but the conspicuity of the feature details was limited by interplane artifacts; the FBP algorithms provided the highest edge sharpness for microcalcifications but the quality of masses was poor.
Journal ArticleDOI
Full breast digital mammography with an amorphous silicon‐based flat panel detector: Physical characteristics of a clinical prototype
Srinivasan Vedantham,Andrew Karellas,Sankararaman Suryanarayanan,Douglas Albagli,Sung Han,Eric J. Tkaczyk,Cynthia Elizabeth Landberg,Beale Opsahl-Ong,Paul R. Granfors,Ilias Levis,Carl J. D'Orsi,R. Edward Hendrick +11 more
TL;DR: The response of the imager was linear and did not exhibit signal saturation under tested exposure conditions, and Detector element nonuniformity and electronic gain variations were not significant after appropriate calibration and software corrections.
Journal ArticleDOI
Tuned-aperture computed tomography (TACT). Theory and application for three-dimensional dento-alveolar imaging.
TL;DR: TACT shows promise as a supplement to film-based dental radiography and as a digital alternative to conventional tomographic systems used in dento-alveolar applications.
Patent
Method and system for creating task-dependent three-dimensional images
TL;DR: In this paper, a first series of projected images of the selected object is recorded in a first projection plane and a second series of projections of the chosen object are rendered at a common magnification.
References
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Book
Matrix iterative analysis
TL;DR: In this article, the authors propose Matrix Methods for Parabolic Partial Differential Equations (PPDE) and estimate of Acceleration Parameters, and derive the solution of Elliptic Difference Equations.
Journal ArticleDOI
Constrained iterative restoration algorithms
TL;DR: It is shown that by predistorting the signal (and later removing this predistortion) it is possible to achieve spectral extrapolation, to broaden the class of signals for which these algorithms achieve convergence, and to improve their performance in the presence of broad-band noise.
Journal ArticleDOI
TOMOSYNTHESIS: A Three-Dimensional Radiographic Imaging Technique
TL;DR: A three-dimensional radiographic imaging system that reduces conventional radiographs into a display volume according to a geometry which matches the X-ray source geometry, and produces the tomographic plane corresponding to the screen's position.
Journal ArticleDOI
Convergence criteria for iterative restoration methods
TL;DR: The use of the residual signal in defining a practical criterion to indicate when the numerical algorithm has converged is investigated and the advantage of this criterion over the criterion of examining successive iterations is demonstrated.
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