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- Larsson, Joel,1986Gothenburg University,Göteborgs universitet,Institutionen för kliniska vetenskaper,Institute of Clinical Sciences (author)
Visualization of the distortion induced by nonlinear noise reduction in computed tomography
- Article/chapterEnglish2023
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- 2023
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- LIBRIS-ID:oai:gup.ub.gu.se/330667
- https://gup.ub.gu.se/publication/330667URI
- https://doi.org/10.1117/1.Jmi.10.3.033504DOI
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- Language:English
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- Purpose: We developed a method to visualize the image distortion induced by nonlinear noise reduction algorithms in computed tomography (CT) systems.Approach: Nonlinear distortion was defined as the induced residual when testing a reconstruction algorithm by the criteria for a linear system. Two types of images were developed: a nonlinear distortion of an object (NLDobject) image and a nonlinear distortion of noise (NLDnoise) image to visualize the nonlinear distortion induced by an algorithm. Calculation of the images requires access to the sinogram data, which is seldomly fully provided. Hence, an approximation of the NLDobject image was estimated. Using simulated CT acquisitions, four noise levels were added onto forward projected sinograms of a typical CT image; these were noise reduced using a median filter with the simultaneous iterative reconstruction technique or a total variation filter with the conjugate gradient least-squares algorithm. The linear reconstruction technique filtered back-projection was also analyzed for comparison.Results: Structures in the NLDobject image indicated contrast and resolution reduction of the nonlinear denoising. Although the approximated NLDobject image represented the original NLDobject image well, it had a higher random uncertainty. The NLDnoise image for the median filter indicated both stochastic variations and structures reminding of the object while for the total variation filter only stochastic variations were indicated.Conclusions: The developed images visualize nonlinear distortions of denoising algorithms. The object may be distorted by the noise and vice versa. Analyzing the distortion correlated to the object is more critical than analyzing a distortion of stochastic variations. The absence of nonlinear distortion may measure the robustness of the denoising algorithm.
Subject headings and genre
- MEDICIN OCH HÄLSOVETENSKAP Klinisk medicin Radiologi och bildbehandling hsv//swe
- MEDICAL AND HEALTH SCIENCES Clinical Medicine Radiology, Nuclear Medicine and Medical Imaging hsv//eng
- computed tomography
- image quality
- noise reduction algorithms
- nonlinear reconstruction
- radiation-dose reduction
- iterative reconstruction
- ct
- performance
- algorithm
- detectability
- contrast
- Radiology
- Nuclear Medicine & Medical Imaging
Added entries (persons, corporate bodies, meetings, titles ...)
- Båth, Magnus,1974Gothenburg University,Göteborgs universitet,Institutionen för kliniska vetenskaper,Institute of Clinical Sciences(Swepub:gu)xbatma (author)
- Thilander-Klang, Anne,1959Gothenburg University,Göteborgs universitet,Institutionen för kliniska vetenskaper,Institute of Clinical Sciences(Swepub:gu)xthian (author)
- Göteborgs universitetInstitutionen för kliniska vetenskaper (creator_code:org_t)
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- In:Journal of Medical Imaging10:32329-4302
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