Study on the Radiation Dose Distribution of Abdominal CT Scans Based on Dose Simulation Humans

Objective: This study aimed to systematically measure and analyze the radiation dose distribution in the abdomen and specific areas of interest on the body surface during abdominal CT scans using a dose simulation phantom, providing relevant data to assess patient radiation risks and to develop personalized radiation protection strategies. Methods: The study simulated routine clinical abdominal CT using a dose simulation phantom. Forty-two tissue detection points and eight surface points on the phantom were selected to represent major organs in the trunk and key areas of concern on the body surface. RGD-3B thermoluminescence was used to measure the dose level of the main organs and key parts of the body surface. Results: Experimental data from the dose simulation phantom were analyzed and indicated that the stomach received the highest radiation dose at 15.9 mGy, followed by the kidneys and pancreas, at 15.7 mGy and 14.4 mGy, respectively. The doses for the adrenal glands, gallbladder, and left lobe of the liver were 14.3, 13.2, and 12.9 mGy, respectively. All other areas received doses < 6.9 mGy. Surface area dose measurements showed that the left and right eye lens received a dose of 0.017 and 0.029 mGy, respectively. The dose for the thyroid was 0.062 mGy and 0.057 mGy on the left and right sides, respectively. The doses to the left and right breasts were 1.71 mGy and 1.58 mGy, respectively. The gonads received doses of 0.145 mGy and 0.090 mGy on the left and right sides, respectively. The skin entry dose at the lower edge of the breast, which is near the skin during CT scans, was between 1 and 2 mGy. Conclusion: During abdominal CT, the stomach, kidneys, and pancreas received the highest radiation doses. Although the radiation dose of sensitive areas on the body surface is lower, that in the thyroid, gonads, and lens remain higher than that in other surface tissues. These findings suggest that workers may need further protection in specific high-dose areas to reduce potential radiation hazards.