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Published on: February 20, 2021
[Estimation of Air Kerma-area Product Using Real-time Dosimeter in Mobile X-ray Fluoroscopy System]
Junichi Taoka1, Hideyuki Kato1, Tetsuharu Kasahara1
1Department of Radiology, Chiba University Hospital.
Purpose:
This study aimed to estimate the air kerma-area product of a mobile X-ray fluoroscopy system by using a real-time dosimeter in situations where an area dosimeter is not available.
Methods:
A real-time dosimeter was mounted on the C-arm of a mobile X-ray fluoroscopy system. Using an ionization dosimeter as a reference, we evaluated the correlation between the air kerma-area product measured by the fluoroscopy system and the readings obtained from the mounted real-time dosimeter. Tube voltage was varied from 60 to 110 kV in 10-kV increments, and phantom thickness varied from 5 to 20 cm in 5-cm increments. In addition, the irradiation field area was adjusted across five levels, ranging from 168.1 to 75.5 cm2.
Results:
A strong linear relationship was observed between the real-time dosimeter readings x-axis and the air kerma-area product values y-axis, expressed as the regression equation y=36.181x+0.2188. The correlation coefficient was r=0.99.
Conclusion:
This study suggests that the air kerma-area product can be estimated by placing a real-time dosimeter on a mobile X-ray fluoroscopy system without an area dosimeter.
