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KMID : 1131320150170020123
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Journal of Korean Society of Computed Tomographic Technology
2015 Volume.17 No. 2 p.123 ~ p.132
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Dose reduction of medical personnel using breathing circuit during brain CT examination with artificial manual breathing unit bagging
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Nam Gyu-Suk
Lee Dong-Hee
Koo Bon-Seung
Gwon Sun-Ahn
Dae Chang-Min
Min Kwan-Hong
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Abstract
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Purpose : The study evaluates the effect of radiation dose reduction of medical personnel in using breathing circuit during brain CT examination with artificial manual breathing unit bagging.
Materials and methods: Sets of equipment used in the examinations were 256-MDCT(Brilliance iCT, Philips health care, Cleveland. OH, USA). rando anthropomorphic woman phantom(Alderson Research Laboratories inc., Stanford, USA), x-ray protect ive apron, x-ray protective glasses(FT-400, Korea), mobile lead glass screen(0.5 mm Pb, KYOWAGLAS-XA, KURRAY, JAPAN), mannequin, breathing circuit(42 inch, Korea) and thermo-luminescence dosimeter (UD802,Panasonic, Japan).
A comparative experimental research method was used in the study and all experiments were conducted near the scanner. Without wearing radiation protectors was the control group and experimental groups are as follows;
Group A - Wearing radiation protectors
Group B - 42 inch away from iso-center by using breathing circuit and protectors
Group C - Using mobile lead glass screen on group B’s condition
Brain CT examinations of each experiment practiced five times to measure the surface effective dose of eyeball, breast and gonad of mannequin
Results:
1. Surface effective dose of the eyeball
Control group’s effective dose was 0.54 mSv. Group A, B, C showed 0.16 mSv, 0.08 mSv, 0.01 mSv respectively. The rate of effective dose of experimental groups decreased by 70%, 85%, 98% compare with the control group.
2. Surface effective dose of the breast
Control group’s effective dose was 0.65 mSv. Group A, B, C showed 0.11 mSv, 0.01 mSv, 0.01 mSv respectively. The rate of effective dose of experimental groups decreased by 83%, 98%, 98% compare with the control group.
3. Surface effective dose of the gonad
Control group’s effective dose was 0.57 mSv. Group A, B, C showed 0.12 mSv, 0.01 mSv, 0.01 mSv respectively. The rate of effective dose of experimental groups decreased by 79%, 98%, 98% compare with the control group.
Conclusion : By using breathing circuit, effective dose reduction rate of the eyeball, breast and gonad for medical personnel decreased by 85%, 98%, 98%.
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KEYWORD
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artificial manual breathing unit bagging, breathing curcuit, radiation protectors
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