Background/introduction
Japanese have more than 26 million CT scans every year. And these are approximately one in four of all Japanese in the examination. And this predicts the possibility that an estimated 29,000 Japanese will be diagnosed with cancer each and every year 1) 2).
The computed tomography dose index volume (CTDIvol) of exposure dose defined by diagnostic reference level (DRL) in each country is much higher for head CT 60 to 85 mGy than for the chest and abdomen CT 15 to 35 mGy 3-5)....
Description of activity and work performed
(Methods and materials)
CT Scanning
CT scans were performed on a 64-detector row CT scanner (Lightspeed VCT; GE Healthcare, Wisconsin, USA). The scanning parameters were as follows: Scan mode, axial: Tube voltage, 120 kVp; tube current, 260-280 mA; beam width, 20 mm; scan mode, full; gantry rotation time, 2.0 seconds; bowtie filter, small; CTDIvol, 86.85 mGy; dose length product (DLP), 1182.46 mGy・cm. The scanning range was from parietal to foramen magnum.
Dose measurement
We used a whole-body human equivalent phantom (Whole Body Phantom PBU-10; KYOTOKAGAKU,...
Conclusion and recommendations
As we know, optimal protection is needed to reduce radiation exposure. Also, The ICRP at 2011 recommended that the tissue weighting factor in mammary gland should be raised to 0.12 7). Therefore, we will make educational materials for the patient to reduce exposure dose. This result will be useful for exposure dose protection of the patients. If the staff had known of the outside dose of the examination, protection during the positioning of the patient in a CT scan would keep the patient's exposure as...
Personal/organisational information
Takayuki Oku, radiological technologist, Tsuchiya general hospital, Hiroshima, Japan
Tsuchiya General Hospital
3-30 Nakajima-cyou Naka-ku Hiroshima Japan
Phone: + 81822439191
Fax: + 81822411865
E-mail
[email protected]
Takanori Masuda, radiological technologist, Tsuchiya general hospital, Hiroshima, Japan
Takayuki Yoshiura, radiological technologist, Tsuchiya general hospital, Hiroshima, Japan
Yoriaki Matsumoto, radiological technologist, Tsuchiya general hospital, Hiroshima,Japan
Yukari yamashita, radiological technologist, Tsuchiya general hospital, Hiroshima, Japan
Masato Yoshida, radiological technologist, Tsuchiya general hospital, Hiroshima, Japan
References
1) Health Status. https://stats.oecd.org/. OECD, January 8, 2020
2) Medical facility survey. https://www.mhlw.go.jp/toukei/list/79-1.html. Ministry of Health, Labour and Welfare, January 8, 2020
3) European Commission. 1999. European guidelines on quality criteria for computed tomography. Office for Official Publications of the European Communities, Luxembourg, Report EUR 16262 EN.
4) Shrimpton PC, Hillier MC, Lewis MA, Dunn M. 2005. Doses from computed tomography 14 (CT) examinations in the UK-2003 review. Public Health England, UK, NRPB-W67.
5) NCRP. 2012. Reference Levels and Achievable Doses in Medical and Dental...