Advances in Low-Dose Tomography

A Special Issue of Tomography (ISSN 2379-139X).

Deadline for manuscript submissions: 21 October 2026 | Viewed by 1868

Editor

1. Department of Imaging and Functional Medicine, Division Diagnostics, Gävle Hospital, Region Gävleborg, 801 88 Gävle, Sweden
2. Centre for Research and Development, Uppsala University/Region Gävleborg, 801 88 Gävle, Sweden
Interests: computed tomography (CT); cone-beam CT; tomosynthesis; three-dimensional mammography; photon-counting techniques; image re-construction; geo-metrical considerations; AI-based methods

Special Issue Information

Dear Colleagues,

In recent decades, there has been a focus on evaluating low-dose (LD) CT protocols to mitigate the risks associated with late effects. Initial research on LD scanning predominantly utilized methods that decreased kVp and/or mAs during the image reconstruction process with traditional filtered-back projection (FBP). Decreasing slice thickness enhances the identification of subtle features, such as calcifications; nonetheless, this method also results in increased image noise. Recent reports indicate that the average effective doses for LD CT range from 1.5 to 2 mSv, which corresponds to one-sixth to one-fourth of the doses associated with conventional chest CT. Modern CT scanners employ ultra-low-dose (ULD) scanning, made possible by advancements in various iterative reconstruction (IR) techniques or AI-driven methods. This Special Issue welcomes submissions focused on the latest developments in low-dose 3D imaging. It encompasses a range of tomography techniques, including CBCT, tomosynthesis, limited-angle CBCT, and multi-detector CT, along with their advancements in clinical applications.

Dr. Tony Svahn
Guest Editor

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 250 words) can be sent to the Editorial Office for assessment.

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Keywords

  • computed tomography (CT)
  • cone-beam CT
  • advancements
  • low-dose
  • ultra-low-dose
  • techniques
  • iterative reconstruction
  • artificial intelligence
  • clinical applications

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Published Papers (1 paper)

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Research

15 pages, 2152 KB  
Article
Evaluation of Radiation Dose and Image Quality in the Transition from Conventional Pelvimetry to Low-Dose Helical CT Pelvimetry
by K. Shahgeldi, M. Parenmark, L. Claesson and T. M. Svahn
Tomography 2026, 12(3), 35; https://doi.org/10.3390/tomography12030035 - 4 Mar 2026
Viewed by 1251
Abstract
Purpose: The present study aimed to assess the radiation dose associated with low-dose (LD) CT pelvimetry compared with conventional radiography and to evaluate the adequacy of the resulting image quality. Methods: The absorbed dose was measured using thermoluminescent dosimeters positioned in an anthropomorphic [...] Read more.
Purpose: The present study aimed to assess the radiation dose associated with low-dose (LD) CT pelvimetry compared with conventional radiography and to evaluate the adequacy of the resulting image quality. Methods: The absorbed dose was measured using thermoluminescent dosimeters positioned in an anthropomorphic female phantom, including uterine locations, to estimate the fetal dose. Conventional radiographic pelvimetry and LD-CT pelvimetry were performed using clinically implemented protocols. Effective dose was calculated using Monte Carlo–based modeling applying acquisition parameters and retrospective patient dose registry data. Image quality of LD-CT pelvimetry was independently evaluated in 14 consecutive clinical cases using a four-point ordinal scale. Results: LD-CT pelvimetry reduced the mean absorbed pelvic dose by approximately 50% compared with conventional pelvimetry (0.18 vs. 0.39 mGy) and decreased estimated fetal dose by 40% (0.21 vs. 0.37 mGy). These estimates were based on standardized single acquisitions and did not incorporate additional radiation from retakes commonly observed in conventional practice. CT demonstrated substantially more homogeneous dose distribution, whereas conventional pelvimetry exhibited marked heterogeneity with peak values up to 2.3 mGy. The maternal effective dose was lower for LD-CT (0.16 mSv) than for conventional pelvimetry (0.36 mSv); inclusion of retakes increased the conventional effective dose to 0.71 mSv. All CT examinations were diagnostically adequate, and no recalls were required. Conclusions: Optimized low-dose CT pelvimetry significantly reduces radiation dose compared with conventional radiographic pelvimetry while maintaining reliable diagnostic image quality. These results support the clinical adoption of CT-based pelvimetry as a dose-efficient and reproducible alternative to conventional techniques. Full article
(This article belongs to the Special Issue Advances in Low-Dose Tomography)
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