Keywords:
Not applicable, Experimental, Occupational / Environmental hazards, Dosimetric comparison, Radiation safety, Dosimetry, CT, Radioprotection / Radiation dose, Radiographers
Authors:
Y. Takei1, S. Suzuki2, H. Itoh3, M. Hashimoto4, H. Ueno5, A. Hirosawa5, S. Ishizaki3, K. Matsubara6, I. Kobayashi7; 1Kurashiki/JP, 2Nagoya, Aichi/JP, 3Toyama/JP, 4Kobe/JP, 5Takaoka/JP, 6Kanazawa/JP, 7Tsukuba, Ibaraki/JP
DOI:
10.26044/ecr2020/C-00463
Conclusion
The effective energy of scatter X-rays were 59 KeV with SE scan and 65 KeV with DE scan. The scatter X-rays of DE scan had been significant higher effective energy. Because of the significant higher effective energy of scatter X-rays with DE scan, the percent penetration of scatter X-rays through the aprons were increased than SE scan.
The DE scan with dual-source CT generates scattered X-rays which have higher effective energy than those from single-energy scan because it uses tin (Sn) filtration to the high tube voltage (see fig.8).
In the thickness of 0.25 mm lead apron, the percent penetration of scatter X-rays through the aprons were significantly increased up to 2.6 times of the thickness of 0.35 mm lead apron. The thickness of 0.5 mm lead apron provided best protection from higher effective energy of scatter X-rays, but it was heavy (up to 6.0 kg).
Considering weight of the apron and protection effect from the scatter X-rays, we strongly recommend the thickness of lead aprons at least 0.35 mm shall be worn with the DE scan. When the caregiver had short time for wearing, we recommend wearing the thickness of 0.5 mm lead aprons if you allowed.