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Image quality for radiotherapy CT simulators with different scanner bore size.

Nada Tomic1, Pavlos Papaconstadopoulos1, Saad Aldelaijan2

  • 1Medical Physics Unit, McGill University, Montréal, Québec, Canada; Department of Radiation Oncology, SMBD Jewish General Hospital, Montréal, Québec, Canada.

Physica Medica : PM : an International Journal Devoted to the Applications of Physics to Medicine and Biology : Official Journal of the Italian Association of Biomedical Physics (AIFB)
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This study compared three radiotherapy CT simulators, finding comparable image quality. Philips CT scanners offered superior signal-to-noise ratio, while GE showed better spatial resolution, highlighting the importance of bore size and scanning parameters.

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Image quality comparisonRadiotherapy simulatorScanner bore size

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Area of Science:

  • Medical Imaging Physics
  • Radiotherapy Technology

Background:

  • Accurate image quality is crucial for effective radiotherapy planning.
  • Commercial CT simulators vary in design, potentially impacting image performance.

Purpose of the Study:

  • To compare image quality parameters of three radiotherapy CT simulators.
  • To ensure an unbiased evaluation by standardizing surface dose using GafChromic™ film.

Main Methods:

  • Compared GE LS 16, Philips Brilliance Big Bore, and Toshiba Aquilion LB CT simulators.
  • Evaluated spatial resolution, low contrast detectability, uniformity, and CNR using a CATPHAN-504 phantom.
  • Standardized surface dose across scanners to within 2%.

Main Results:

  • GE simulator showed slightly better spatial resolution.
  • Philips CT images demonstrated superior signal-to-noise ratio (SNR) and contrast-to-noise ratio (CNR) for most materials.
  • Toshiba CT performance was intermediate.

Conclusions:

  • Image quality parameters were comparable across the three radiotherapy CT simulators.
  • Scanner bore size is a critical factor in radiotherapy applications.
  • Optimizing scanning parameters can compensate for image quality variations and balance patient dose with diagnostic needs.