Comparison of monte carlo tally techniques for dosimetry in a transmission-type X-ray tube

Chen-Ju Feng; Chin-Hui Wu; Chin-Hsiung Lin; Shu-Wei Wu; Shih-Yong Luo; Ya-Ru Yang; Chao-Hua Lee; Shao-Chun Tseng; Shen-Hao Lee; Shih-Ming Hsu; Chin-Hui Wu

doi:10.1088/2057-1976/ad7bbf

Comparison of monte carlo tally techniques for dosimetry in a transmission-type X-ray tube

Biomed Phys Eng Express. 2024 Sep 17. doi: 10.1088/2057-1976/ad7bbf. Online ahead of print.

Authors

Affiliations

¹ Department of Biomedical Imaging and Radiological Sciences,, National Yang Ming Chiao Tung University, No. 155, Sec. 2, Linong St. Beitou Dist., taipei, 112304, TAIWAN.
² Department of Medical Imaging and Radiological Sciences, Tzu Chi University of Science and Technology, 880,Sec.2,Chien-kuo Rd.Hualien City, Hualien, 970, TAIWAN.
³ Department of Biomedical Imaging and Radiological Sciences, National Yang Ming Chiao Tung University, No. 155, Sec. 2, Linong St. Beitou Dist., Taipei, 112304, TAIWAN.
⁴ Department of Radiation Oncology, Chang Gung Memorial Hospital Linkou, No.5, Fuxing St., Guishan Dist., Taoyuan, 333423, TAIWAN.
⁵ NanoRay Biotech Co Ltd, 7F., No.91 Xinhu 1st Rd., Neihu Dist., Taipei, 114, TAIWAN.
⁶ Department of Biomedical Imaging and Radiological Sciences,, National Yang Ming Chiao Tung University, No. 155, Sec. 2, Linong St. Beitou Dist., Taipei, 112304, TAIWAN.
⁷ Department of Medical Imaging and Radiological Sciences, Tzu Chi University of Science and Technology, No.880, Sec.2, Chien-kuo Rd., Hualien City, Hualien, 970302, TAIWAN.

PMID: 39288783
DOI: 10.1088/2057-1976/ad7bbf

Abstract

This study discussed comparing result accuracy and time cost under different tally methods using MCNP6 for a novel transmission X-ray tube which was designed for the Auger electron yield with specific material (eg. iodine). The assessment included photon spectrum, percent depth dose, mass-energy absorption coefficient corresponding to air and water, and figure of merit comparison. The mean energy of in-air phantom was from 41.8 keV (0 mm) to 40.9 keV (100 mm), and the mean energy of in-water phantom was from 41.41 keV (0 mm) to 45.2 keV (100 mm). The specific dose conversion factors based mass-energy absorption coefficient corresponding to different materials was established and the difference was less than 2% for the dose conversion of FMESH comparing to measurement data. FMESH had better figure of merit (FOM) than the F6 tally for the dose parameter assessment, which mean the dose calculation that focused on the superficial region could be assessed with more calculation efficiency by FMESH tally for this novel transmission X-ray tube. The results of this study could help develop treatment planning system (TPS) to quickly obtain the calculated data for phase space data establishment and heterogeneous correction under different physical condition settings.&#xD.

Keywords: Monte Carlo simulation; dose conversion; figure of merit; transmission X-ray tube.