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Impact of radiation dose and iterative reconstruction (IR) level on low-contrast detectability with 4-AFC approach

Author

Listed:
  • Indah R. Ilham
  • Choirul Anam
  • Heri Sutanto
  • Ariij Naufal
  • Riska Amilia

Abstract

This study evaluated impacts of dose and iterative reconstruction (IR) level on low-contrast detectability in images of AAPM CT Performance phantom using a 4-alternative forced choice (4-AFC) approach. Five medical physicists detected low-contrast and small objects having size of 3.0 mm with the 4-AFC method. The tests were conducted at three different radiation doses (35.8 mGy, 54.1 mGy, and 72.1 mGy) at various IR levels from 0% to 100%. The total number of 4-AFC questions was 330 questions in which each observer answered the questions in 60 minutes. Percent correct answers increase as the IR level increases from 0 to 100%. The percent correct answers also increase as the dose increases from 34.8 mGy to 72.1 mGy. 100% correct answers start at IR levels of 70, 60, and 40% for doses of 34.8, 54.1, and 72.1 mGy, respectively. Conclusions: Increasing IR level and dose improve image quality, i.e., higher average percent correct answers. At IR levels around 50%, the average percent correct is close to the maximum (around 100%) for all radiation doses. An optimal combination of IR and radiation dose can produce good image quality with lower radiation dose.

Suggested Citation

  • Indah R. Ilham & Choirul Anam & Heri Sutanto & Ariij Naufal & Riska Amilia, 2024. "Impact of radiation dose and iterative reconstruction (IR) level on low-contrast detectability with 4-AFC approach," International Journal of Scientific Research in Science and Technology, Technoscience Academy, vol. 11(6), pages 272-278, December.
    • Handle: RePEc:etm:ijsrst:v11:y2024:i6:id:415
    DOI: 10.32628/IJSRST24116181
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