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September 5, 2026Annals of Biomedical EngineeringOpen Access

CBCT Dose Is Reduced with Angular Tube Current Modulation While Maintaining Image Quality and Reducing Photon Starvation Artifacts

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Authors

THTero HyvärinenSOSamuel OnnelaTLTimo Liimatainen

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Overview

Experimental phantom study demonstrates that angular tube current modulation reduces CBCT radiation dose by up to 20% while preserving image quality, indicating potential for clinical adoption.

Key Points

  • To evaluate whether scout-derived angular tube current modulation (ATCM) in cone beam computed tomography (CBCT) reduces radiation dose while preserving image quality and reducing artifacts.
  • Developed a projection-based noise model using polymethyl methacrylate slabs (80–120 kV) and derived angle-dependent current-time product profiles from posterior-anterior and lateral scout views.
  • Emulated ATCM using anthropomorphic and uniform water phantoms on a clinical CBCT system to evaluate dose-area product (DAP), Monte Carlo-derived effective dose, and noise texture.
  • Assessed subjective image quality via blinded paired preference evaluations performed by five board-certified radiologists across 60 paired reads.
  • ATCM reduced DAP by up to 17% and Monte Carlo effective dose by up to 20% relative to unmodulated scans.
  • Reconstructions maintained baseline image noise texture, reduced photon starvation artifacts in high-attenuation projections, and improved thoracic vertebra delineation.
  • Radiologists favored ATCM in 60% of paired comparisons overall, showing highest preference in torso protocols (80%) and jaw protocols (60%).

Cite This Study

Hyvärinen et al. (2026) studied this question.

synapsesocial.com/papers/6a9bd4216b95aff0620eb7d4https://doi.org/10.1007/s10439-026-04354-9
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