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A method for selecting a protocol for routine body CT scan using Gemstone Spectral Imaging with or without adaptive

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Summary

This study presents a method for selecting computed tomography (CT) scan protocols to achieve comparable image noise using gemstone spectral imaging (GSI) with or without adaptive statistical iterative reconstruction (ASiR) to conventional CT. A table of equivalent milliampere-seconds (mAs) values was generated for monochromatic image acquisition.

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Area of Science:

  • Medical Imaging
  • Radiology
  • Computed Tomography (CT)

Background:

  • Gemstone spectral imaging (GSI) offers advanced material decomposition and monochromatic image (MI) generation.
  • Optimizing GSI protocols, especially with adaptive statistical iterative reconstruction (ASiR), is crucial for balancing image quality and radiation dose.
  • Establishing equivalent scanning parameters between conventional CT and GSI is essential for seamless clinical integration.

Purpose of the Study:

  • To develop and validate a method for selecting body CT scan protocols for monochromatic image (MI) acquisition using gemstone spectral imaging (GSI).
  • To evaluate the impact of adaptive statistical iterative reconstruction (ASiR) on protocol selection for GSI.
  • To establish comparable image noise levels between GSI protocols and conventional CT protocols.

Main Methods:

  • A phantom was scanned using conventional CT at 120 kVp and GSI across various milliampere-second (mAs) settings.
  • Monochromatic images (MIs) at 65 keV were reconstructed from GSI data with ASiR applied at varying levels (0-100%).
  • Image noise was quantified as the standard deviation (SD) within regions of interest, and linear regression was used to determine equivalent mAs values.

Main Results:

  • A strong linear correlation (r = 1.00, P < 0.0001) was observed between the mAs required for GSI (with and without ASiR) and conventional CT to achieve similar image noise.
  • A comprehensive table was generated, providing equivalent mAs values for monochromatic images at 65 keV compared to conventional CT at 120 kVp.
  • The findings demonstrate that GSI protocols, with or without ASiR, can achieve image noise levels comparable to conventional CT.

Conclusions:

  • A reliable method exists for selecting body CT scan protocols to acquire monochromatic images (MIs) at 65 keV using GSI, with or without ASiR.
  • The established equivalent mAs values allow for the selection of GSI protocols that yield image quality comparable to conventional CT at 120 kVp.
  • This facilitates the implementation of GSI for routine clinical body CT examinations, potentially optimizing image quality and diagnostic confidence.