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Calculation of Radiation Doses to Patients Undergoing Interventional Procedures by Monte Carlo Simulations

HW Nam, MY Lee, HJ Na, KP Kim*, Kyung Hee University, Yongin-si,Gyeonggi,KR

Presentations

(Sunday, 7/12/2020)   [Eastern Time (GMT-4)]

Room: AAPM ePoster Library

Purpose: To estimate radiation doses to patients undergoing interventional procedures by Monte Carlo simulations.


Methods: Five interventional procedures, including TACE (Transcatheter arterial chemoembolization), AVF (Arteriovenous fistula), PTBD (Percutaneous transhepatic biliary drainage), PCN (Percutaneous nephrostomy), and BAE (Bronchial artery embolization) were selected for radiation doses estimation. Many factors influence the radiation doses to patients during the interventional procedures. Principal factor among these are the fluoroscopic system operation. Therefore, standard exposure scenarios for each procedure were assumed based on analysis of dose reports of the procedures and expert consult. The exposure scenarios included projection directions, proportion of radiation dose for each projection direction, and examination area, system technical settings, etc. Nation-wide average of DAP (dose area product) value for each procedure was used for total radiation exposure during the procedure. MCNP code and ICRP human phantoms were used for the dose calculation.


Results: Effective doses were 29.3 (TACE), 0.1 (AVF), 3.0 (PTBD), 1.3 (PCN), and 8.3 (BAE) mSv/procedure. DAP value for each procedure was 155 (TACE), 11.4 (AVF), 19.4 (PTBD), 7.0 (PCN), and 98.5 (BAE) Gy·cm2/procedure. Organ doses normalized by DAP were high in kidney for TACE and PTBD and in lung for BAE. Organ doses to kidney, adrenal gland, spleen, and liver were in the range of 66~164.5 mGy during TACE and 7.7~19.7 mGy during PTBD. Organ doses to adrenal gland, spleen, liver, and lung were in the range of 6.1~30 mGy during BAE.


Conclusion: Radiation doses to patients undergoing interventional procedures were calculated. Radiation doses to patients during the procedures widely varied depending on many factors. The results of this study can be used for optimization of radiation protection during the interventional procedures and can contribute to the reduction of patient doses.

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Funding Support, Disclosures, and Conflict of Interest: This research was supported by a fund(2020E380400) by Research of Korea Centers for Disease Control and Prevention.

Keywords

MCNP, Phantoms, Radiation Protection

Taxonomy

IM- Multi-Modality Imaging Systems: Fluoroscopy/Optical

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