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CT radiation profile width measurement using CR imaging plate raw data.

Thorarin Albert Bjarnason1, Chang-Ying Joseph Yang

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Area of Science:

  • Medical Physics
  • Radiological Imaging Technology

Background:

  • Accurate measurement of computed tomography (CT) collimation width is crucial for quality control.
  • Existing methods using computed radiography (CR) often require complex adjustments to avoid signal clipping in processed images.

Purpose of the Study:

  • To demonstrate a novel methodology for CT collimation width measurement using CR imaging plate raw data.
  • To establish a more convenient and precise method for routine CT quality control.

Main Methods:

  • Utilized CR imaging plate raw data for CT radiation profile measurements across 14 CT scanners.
  • Developed MATLAB scripts to analyze raw CR data for collimation width measurement.
  • Compared the raw data approach with previously established CR-processed data methodologies.

Main Results:

  • Demonstrated the feasibility of CT collimation width measurement using a single scan with CR raw data, avoiding image saturation.
  • Identified a log-linear relationship between raw pixel value and air kerma.
  • Raw data measurements showed agreement with CR-processed data, with improved flexibility and precision due to wider dynamic range.

Conclusions:

  • A convenient and precise methodology for CT collimation width measurement using CR raw data has been established.
  • This raw data approach eliminates the need for CR scanning parameter adjustments, streamlining routine quality control.
  • Open-source analysis scripts are provided for broader application and research.