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Image quality and dose reduction in sinus computed tomography using iterative reconstruction: a cadaver study.

Adam J Kimple1, Stanley W McClurg1, Benjamin Y Huang2

  • 1Department of Otolaryngology-Head and Neck Surgery, University of North Carolina at Chapel Hill, USA.

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|December 18, 2018
PubMed
Summary

Iterative reconstruction (IR) did not improve sinus CT image quality compared to filtered back projection (FBP) at lower radiation doses. Higher kilovolt (kV) and milliampere (mA) settings are crucial for better anatomical landmark identification in sinus CT scans.

Keywords:
computed tomographycomputer assisted surgeryimagingradiologysinus anatomy

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Area of Science:

  • Radiology
  • Medical Imaging
  • Otolaryngology

Background:

  • Growing concerns regarding radiation dose in computed tomography (CT) have spurred interest in iterative reconstruction (IR).
  • IR offers potential for reduced noise and lower radiation doses compared to traditional filtered back projection (FBP).

Purpose of the Study:

  • To evaluate if IR can yield comparable sinus CT image quality to FBP at reduced kilovolt (kV) and milliampere (mA) settings.
  • To determine optimal scan parameters for sinus imaging.

Main Methods:

  • 30 sinus CT scans were acquired on cadaver heads using varying kV and mA settings.
  • Scans were reconstructed using FBP and three IR techniques.
  • Image quality was assessed by rhinologists and neuroradiologists using a 5-point Likert scale for 16 anatomical landmarks.

Main Results:

  • Higher kV and mAs settings significantly improved image quality for anatomical landmark identification.
  • Surgical suitability plateaued at a radiation dose of 0.1201 mSv.
  • The IR algorithm did not offer a significant benefit in overall image quality at fixed kV and mAs.

Conclusions:

  • Sinus CT image quality for structure identification is strongly correlated with kV, mA, and radiation dose.
  • Iterative reconstruction did not provide additional advantages in image quality for sinus CT imaging under the tested conditions.