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Area of Science:

  • Medical Imaging Physics
  • Radiological Technology
  • Image Quality Assessment

Background:

  • Computed Tomography (CT) scanners are crucial for medical diagnostics.
  • Image noise is a critical factor affecting diagnostic accuracy in CT scans.
  • Understanding noise properties across different scanner models and patient sizes is essential for optimizing image quality.

Purpose of the Study:

  • To compare the image noise properties of GE Discovery HD 750 and Toshiba Aquilion ONE CT scanners.
  • To evaluate the impact of simulated patient size variations on CT image noise.
  • To analyze noise power spectrum and total visible noise (TVN) across different dose levels.

Main Methods:

  • Utilized a Catphan 600 phantom with extension rings to simulate varying patient sizes.
  • Scanned the phantom using GE Discovery HD 750 and Toshiba Aquilion ONE scanners at multiple dose levels (10, 15, 20 mGy).
  • Analyzed 36 datasets focusing on noise power spectrum and calculated total visible noise (TVN).

Main Results:

  • Introduction of extension rings significantly altered image noise properties.
  • Without extension rings, Toshiba exhibited lower total visible noise than GE at all tested doses.
  • For larger simulated patients (second and third rings), GE scanners demonstrated lower TVN than Toshiba across all dose levels.

Conclusions:

  • GE scanners may offer superior noise performance compared to Toshiba scanners for larger patient anatomies.
  • Image noise characteristics are significantly influenced by patient size simulation, highlighting the importance of phantom setup.
  • The choice of reconstruction kernel (e.g., Toshiba FC18 vs. FC08) also impacts noise levels, with FC18 generally showing higher TVN.