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Determining optimal imaging protocols for enhanced chest CT: From phantom to clinical study.

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Optimizing enhanced chest CT protocols with adaptive statistical iterative reconstruction-V (ASiR-V) at 60% strength significantly reduces radiation dose while maintaining diagnostic image quality and accuracy.

Keywords:
Low Dose ProtocolLungOrgan Dose Modulation

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Area of Science:

  • Radiology
  • Medical Imaging
  • Radiation Oncology

Background:

  • Chest CT protocols are continuously evolving to balance image quality, diagnostic performance, and radiation dose.
  • Optimizing these protocols is crucial for patient safety and effective disease management.

Purpose of the Study:

  • To determine the optimal imaging protocols for enhanced chest CT.
  • The goal was to achieve high image quality and diagnostic performance with reduced radiation exposure.

Main Methods:

  • Phantom and patient studies were conducted using various scanning modes and adaptive statistical iterative reconstruction-V (ASiR-V) strengths.
  • Image quality, radiation dose, and volumetric measurements were evaluated.
  • Low-dose CT (LDCT) protocols were compared against standard-dose CT (SDCT).

Main Results:

  • The D2 protocol was identified as optimal for enhanced chest CT, achieving the lowest radiation dose.
  • LDCT demonstrated a 45% reduction in radiation dose compared to SDCT.
  • LDCT with ASiR-V60% exhibited comparable noise levels to SDCT with ASiR-V40%, but with superior signal-to-noise ratios (SNRs) and contrast-to-noise ratios (CNRs).
  • No significant differences in lung or tracheal volumes were observed between LDCT and SDCT groups.

Conclusions:

  • A combination of Auto-kV, ODMfull, and ASiR-V60% enables individualized low-dose scanning for contrast-enhanced chest CT.
  • This approach ensures satisfactory image quality and diagnostic accuracy, paving the way for safer imaging practices.