著者

山口 さち子 井澤 修平 前谷津 文雄 圡井 司 引地 健生 藤田 秀樹 今井 信也 赤羽 学 王 瑞生

出版者

日本磁気共鳴医学会

雑誌

日本磁気共鳴医学会雑誌 (ISSN:09149457)

巻号頁・発行日

vol.38, no.4, pp.103-119, 2018 (Released:2018-12-10)

参考文献数

27

---

In this study, we surveyed policies on allocating MRI scan duties to pregnant employees, and investigated the respondents' level of awareness of non-ionizing radiation. We sent 5763 questionnaires to facilities equipped with MRI devices in Japan (the corresponding respondent was a member of the personnel responsible for MRI scan duties). The questionnaire comprised: 1) Basic information; 2) General questions about the employees' pregnancies (e.g., whether the hospital has a particular policy); 3) The policy on MRI scan duties while pregnant and alternative duties ; and 4) Level of awareness of non-ionizing radiation in general. The results revealed inconsistent handling within Japan. Answers stating that ``increase the opportunity of allocation to MRI scan duties compared with the current situation'' accounted for 7.6%, ``maintaining the current frequency of allocation to MRI scan duties'' for 32.3%, and ``reduce the opportunity of allocation to MRI scan duties compared with current situation'' for 52.6%. Around half of facilities prepared work options (e.g. access restriction into MRI scan room or assign extra staff to MRI scan duties) in MRI scan duties during pregnancy. In an attitude survey for non-ionizing radiation emitted by medical devices, respondents showed higher attention compared with that for the radiation emitted by home electronic devices. This report describes a summary of the survey. Further analysis is in progress and will be reported soon.

著者

吉田 礼 町田 好男 小倉 隆英 田村 元 引地 健生 森 一生

出版者

公益社団法人 日本放射線技術学会

雑誌

日本放射線技術学会雑誌 (ISSN:03694305)

巻号頁・発行日

vol.68, no.11, pp.1456-1466, 2012-11-20 (Released:2012-11-21)

参考文献数

16

被引用文献数

3 4

---

Recent progress in variable-flip-angle fast spin-echo technology has further extended the utility of three-dimensional (3D) magnetic resonance imaging (MRI) for clinical application. The slice profile in 3D MRI is the point spread function that has a sync form in principle, whereas a slice profile in 2D imaging provides information on characteristics of selective radio frequency excitation. We investigated the optimal condition to measure 3D slice profiles using a crossed thin-ramps phantom. We found that the profile data should cover a large area in order to evaluate both the main lobe and side lobes in the slice profile, and that the appropriate slice thickness was 2 mm. We also found that artifacts in the direction perpendicular to the slice create an offset error in the measured slice profile when 3D imaging. In this paper, we describe the optimal condition and some remarks on the slice profile evaluation for 3D MRI.