Abdominal CT radiation dose reduction at Siriraj Hospital (Phase III)

Authors

  • Piyaporn Apisarnthanarak, M.D. Department of Radiology, Faculty of Medicine Siriraj hospital, Mahidol University, Bangkok, Thailand
  • Anawat Sriwaleephun, M.D. Department of Radiology, Faculty of Medicine Siriraj hospital, Mahidol University, Bangkok, Thailand
  • Sastrawut Thammakittiphan, B.Sc., M.Sc. Department of Radiology, Faculty of Medicine Siriraj hospital, Mahidol University, Bangkok, Thailand
  • Wimonrat Lornimitdee, B.Sc. Department of Radiology, Faculty of Medicine Siriraj hospital, Mahidol University, Bangkok, Thailand
  • Atchariya Klinhom, RN. Department of Radiology, Faculty of Medicine Siriraj hospital, Mahidol University, Bangkok, Thailand
  • Tarntip Suwatananonthakij, RN. Department of Radiology, Faculty of Medicine Siriraj hospital, Mahidol University, Bangkok, Thailand
  • Kobkun Muangsomboon, M.D. Department of Radiology, Faculty of Medicine Siriraj hospital, Mahidol University, Bangkok, Thailand
  • Wanwarang Teerasamit, M.D. Faculty of Medicine Siriraj hospital
  • Sopa Pongpornsup, M.D Department of Radiology, Faculty of Medicine Siriraj hospital, Mahidol University, Bangkok, Thailand
  • Walailak Chaiyasoot, M.D. Department of Radiology, Faculty of Medicine Siriraj hospital, Mahidol University, Bangkok, Thailand

DOI:

https://doi.org/10.46475/aseanjr.v22i1.82

Keywords:

Abdominal computed tomography, Abdominal CT, Radiation dose reduction, Fixed tube current, FTC, Automatic tube current modulation, ATCM

Abstract

OBJECTIVE: To compare the image quality and the radiation dose between fixed tube current (FTC) low dose abdominal CT currently performed at our hospital and new automatic tube current modulation (ATCM) low dose abdominal CT.

MATERIALS AND METHODS: We prospectively performed ATCM low dose abdominal CT in 88 participants who had prior FTC low dose CT for comparison. Four experienced abdominal radiologists independently and blindly assessed the quality of FTC and ATCM low dose CT images by using a 5-point-scale satisfaction score (1 = unacceptable, 2 = poor, 3 = average, 4 = good, and 5 = excellent image quality). Each reader selected the preferred image set between FTC and ATCM low dose techniques for each participant. The image noise of the liver and the aorta in both techniques was measured. The volume CT dose index (CTDIvol) of both techniques was compared.

RESULTS: The mean satisfaction scores (SD) for FTC and ATCM low dose CT were 4.38 (0.66) and 4.38 (0.64), respectively with the ranges of 3 to 5 in both techniques, which were all acceptable for CT interpretation. The preferred image set between FTC and ATCM low dose techniques of each participant randomly selected by each reader were varied, depending on the readers’ opinions. The mean image noise of the aorta on FTC and ATCM low dose CT accounted for 34.75 and 36.46, respectively, while the mean image noise of the liver was 28.86 and 29.81, respectively. The mean CTDIvol (SD) of FTC and ATCM low dose CT were 8.42 (0.32) and 8.12 (0.43) mGy, respectively.  

CONCLUSION: FTC and ATCM low dose abdominal CT provided comparable acceptable image quality and showed no clinical significance in radiation dose optimization.

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Published

2021-04-30

How to Cite

1.
Apisarnthanarak P, Sriwaleephun A, Thammakittiphan S, Lornimitdee W, Klinhom A, Suwatananonthakij T, Muangsomboon K, Teerasamit W, Pongpornsup S, Chaiyasoot W. Abdominal CT radiation dose reduction at Siriraj Hospital (Phase III). ASEAN J Radiol [Internet]. 2021Apr.30 [cited 2021Nov.29];22(1):5-19. Available from: https://asean-journal-radiology.org/index.php/ajr/article/view/82

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