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CT colonography at low tube potential: using iterative reconstruction to decrease noise.

K J Chang1, M A Heisler1, M Mahesh2

  • 1Department of Diagnostic Imaging, The Warren Alpert Medical School of Brown University, Rhode Island Hospital, 593 Eddy St., Providence, RI 02903, USA.

Clinical Radiology
|June 14, 2015
PubMed
Summary
This summary is machine-generated.

Low tube potential CT imaging increases noise, but iterative reconstruction, specifically adaptive statistical iterative reconstruction (ASiR), effectively reduces this noise. An ASiR level of around 50% at 100 kVp matches the noise levels of 120 kVp imaging without ASiR.

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Area of Science:

  • Radiology
  • Medical Imaging
  • Computed Tomography

Background:

  • Low tube potential computed tomography (CT) is used to reduce radiation dose.
  • Lowering tube potential increases image noise, potentially affecting image quality.
  • Iterative reconstruction techniques aim to improve image quality in CT.

Purpose of the Study:

  • To determine the optimal level of iterative reconstruction needed to mitigate noise in low tube potential CT.
  • To compare image quality metrics at different levels of adaptive statistical iterative reconstruction (ASiR) and tube potentials.

Main Methods:

  • CT colonography was performed on 50 patients at 120 kVp and 100 kVp.
  • Scans were reconstructed using filtered back projection (FBP) and ASiR at 30%, 60%, and 90%.
  • Image noise, attenuation, contrast, and contrast-to-noise ratio (CNR) were analyzed.

Main Results:

  • Reducing tube potential to 100 kVp significantly increased image noise and fluid attenuation.
  • Increasing ASiR levels progressively decreased noise and improved CNR at both tube potentials.
  • ASiR above 30% at 100 kVp resulted in noise levels comparable to or lower than 120 kVp FBP.

Conclusions:

  • Iterative reconstruction effectively compensates for noise increases from low tube potential CT.
  • Adaptive statistical iterative reconstruction (ASiR) improves contrast-to-noise ratio (CNR).
  • Approximately 50% ASiR at 100 kVp achieves noise levels similar to 120 kVp without ASiR.