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<p>The study was conducted using Monte Carlo simulations with the MCNPX code and a third-trimester pregnant-woman phantom, in which the uterine volume is approximately at its average size. Deposited energy, absorbed radiation dose, and both effective and equivalent radiation doses were calculated in the lungs and abdominal region (ovaries, uterus, bladder, colon, and kidneys), as well as in the pelvic area, during exposure to computed tomography using a multi-detector CT (MDCT) scanner. The effect of varying the tube current-time product on the absorbed dose was investigated, and it was found that doubling the initial exposure current resulted in an approximate 50% increase in the absorbed dose to all studied organs. The influence of changing the X-ray tube voltage on the absorbed dose was also examined; increasing the voltage from its initial setting caused a rise of about 59% in the absorbed lung dose and approximately 51–58% in the absorbed dose of the other organs. Furthermore, it was determined that emptying the bladder before imaging reduces the absorbed dose to the bladder by nearly 48.6%.</p>

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Calculation of radiation dose in the lungs, abdomen, and pelvis of a pregnant woman phantom undergoing a CT scan using the MCNPX code

  • 期刊论文

  • 发表日期：

    2026年5月2日

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  • Razan Salloum,
  • Khaled Alnssar,
  • Abdulhadi Soufan

摘要

The study was conducted using Monte Carlo simulations with the MCNPX code and a third-trimester pregnant-woman phantom, in which the uterine volume is approximately at its average size. Deposited energy, absorbed radiation dose, and both effective and equivalent radiation doses were calculated in the lungs and abdominal region (ovaries, uterus, bladder, colon, and kidneys), as well as in the pelvic area, during exposure to computed tomography using a multi-detector CT (MDCT) scanner. The effect of varying the tube current-time product on the absorbed dose was investigated, and it was found that doubling the initial exposure current resulted in an approximate 50% increase in the absorbed dose to all studied organs. The influence of changing the X-ray tube voltage on the absorbed dose was also examined; increasing the voltage from its initial setting caused a rise of about 59% in the absorbed lung dose and approximately 51–58% in the absorbed dose of the other organs. Furthermore, it was determined that emptying the bladder before imaging reduces the absorbed dose to the bladder by nearly 48.6%.