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.

Purpose: This study aimed to clarify the current status and issues related to magnetic field experience in magnetic resonance imaging (MRI) among nurses as basic data for considering experiential education aimed at improving MRI safety. Methods: A questionnaire survey was conducted among 674 nurses at our institution. The survey assessed experience of magnetic field exposure, awareness of MRI-related risks, and the perceived necessity of such experience. Results: Responses were obtained from 438 nurses (response rate: 65.0%). Only 18.9% had experienced magnetic field exposure. In contrast, 90.6% considered such experience necessary. Among those without experience, 75.8% expressed a desire to undergo such training. Conclusion: Although nurses have basic knowledge of MRI magnetic fields, opportunities for experiential learning are limited. Magnetic field experience may be an effective educational approach to improve safety awareness.