Time‐delayed summation as a means of improving resolution on fast rotating computed tomography systems

Nowak, Tristan; Hupfer, Martin; Althoff, Felix; Brauweiler, Robert; Eisa, Fabian; Steiding, Christian; Kalender, Willi A.

doi:10.1118/1.3697533

Cited by 2 publications

(2 citation statements)

References 20 publications

(20 reference statements)

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“…High-contrast system response in x-and y-direction showed significant differences in the periphery due to beam hardening-induced loss in contrast and motion blurring artifacts related to the discrete-time raw data readout process for continuously rotating x-ray source-detectordevices. This performance characteristic is partially averaged out by measuring only the in-plane MTF (e.g., with a wire phantom 68 ). The calculation of 3D MTFs using a sphere phantom 40 represents the preferable strategy to evaluate highcontrast spatial resolution as a function of position and direction on volume tomography units.…”

Section: Discussionmentioning

confidence: 99%

A quality assurance framework for the fully automated and objective evaluation of image quality in cone‐beam computed tomography

2014

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Section: Discussionmentioning

confidence: 99%

A quality assurance framework for the fully automated and objective evaluation of image quality in cone‐beam computed tomography

2014

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“…technique. 12 Closely related to angular integration, overlapping beams were modeled originating from multiple sources. 13 While reducing blurring effects has obvious advantages, the main consequence seems to be prolongation of the acquisition time.…”

Section: Introductionmentioning

confidence: 99%

Modeling blurring effects due to continuous gantry rotation: Application to region of interest tomography

et al. 2015

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Purpose: Projections acquired with continuous gantry rotation may suffer from blurring effects, depending on the rotation speed and the exposure time of each projection. This leads to blurred reconstructions if conventional reconstruction algorithms are applied. In this paper, the authors propose a reconstruction method for fast acquisitions based on a continuously moving and continuously emitting x-ray source. They study the trade-off between total acquisition time and reconstruction quality and compare with conventional reconstructions using projections acquired with a stepwise moving x-ray source. Methods: The authors introduce the algebraic reconstruction technique with angular integration concept, which models the angular integration due to the relative motion of the x-ray source during the projection. Results: Compared to conventional reconstruction from projections acquired with pulsed x-ray emission, the proposed method results in substantially improved reconstruction quality around the center of rotation. Outside this region, the proposed method results in improved radial resolution and a decreased tangential resolution. For a fixed reconstruction quality of this region of interest, the proposed method enables a lower number of projections and thus a faster acquisition. Conclusions: The modeling of the continuous gantry rotation in the proposed method substantially improves the reconstruction quality in a region of interest around the rotation center. The proposed method shows potential for fast region of interest tomography. C 2015 American Association of Physicists in Medicine. [http://dx

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Time‐delayed summation as a means of improving resolution on fast rotating computed tomography systems

Abstract: The findings of this study encourage the combined usage of TDS and FSC in systems that require fast rotation. The integration of TDS in state-of-the-art x-ray detectors is feasible.

Cited by 2 publications

References 20 publications

A quality assurance framework for the fully automated and objective evaluation of image quality in cone‐beam computed tomography

A quality assurance framework for the fully automated and objective evaluation of image quality in cone‐beam computed tomography

Modeling blurring effects due to continuous gantry rotation: Application to region of interest tomography

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