- 著者
- Nobuyasu Ichinose Kentaro Haraoka Takaya Mori Masanori Ozaki Akira Taniguchi
- 出版者
- Japanese Society for Magnetic Resonance in Medicine
- 雑誌
- Magnetic Resonance in Medical Sciences (ISSN:13473182)
- 巻号頁・発行日
- pp.mp.2023-0074, (Released:2023-11-02)
- 参考文献数
- 18
Purpose: Recently, the utility of non-contrast MR endolymphatic hydrops imaging was reported, but the pitfall was indicated based on T2 preparation pulse sensitiveness to local static magnetic field (B0) inhomogeneity. The purpose of this study is to clarify the effects of surrounding magnetic environment of temporal bone to lymphatic fluid signal intensity on the T2 preparation and fluid attenuated inversion recovery pulse combination (T2prep 3D-FLAIR) technique in human inner ear study.Methods: We prepared a custom-made phantom comprising a chicken leg bone submersed in saline. To evaluate signal characteristics of saline close to bone, multiple TE gradient echoes, T2 relaxation time measurement, and T2prep 3D-FLAIR image were acquired. In the vicinity of the vestibule of a healthy volunteer, similar examinations were executed. Additionally, to investigate the influence of the magnetic environment from B0, the evaluation was performed in five head position settings relative to B0.Results: In both the phantom case and volunteer case, together with T2 star signal intensity attenuation, T2 relaxation time shortening was observed on fluid around bone. Specifically, at the outer edge in the vestibule and cochlea of the volunteer, T2 relaxation time was shorter than that of center of vestibule and that of cochlea. In the T2prep 3D-FLAIR image, higher signal intensity was observed at the same location on the outer edge of them. These results showed that bone affects surrounding fluid magnetic environment. Also, for B0 influence, despite a large area variation ratio, there is no statistically significant difference correlated to orientation within B0.Conclusion: The surrounding magnetic environment of the temporal bone affects lymphatic fluid signals of the peripheral part of the human inner ear on T2prep 3D-FLAIR technique.
- 著者
- Koji Sugie Akira Taniguchi
- 出版者
- 一般社団法人 日本鉄鋼協会
- 雑誌
- ISIJ International (ISSN:09151559)
- 巻号頁・発行日
- vol.51, no.3, pp.513-520, 2011-03-15 (Released:2011-03-18)
- 参考文献数
- 56
- 被引用文献数
- 4 11
The bioavailability and durability of Fe released from decarburization steelmaking slag was examined for two marine diatom species. The bioavailability of Fe released from the slag was compared with that from the reagent FeCl3·6H2O in the presence or absence of the synthetic chelator ethylenediaminetetraacetic acid, which affects Fe speciation in seawater. The duration of bioavailability was determined by the recovery of the growth rate on intermittent additions of macro-nutrients other than Fe. Abiotic reduction of bioavailable Fe from the slag in seawater was also investigated for 5 or 15 d. Thus, the bioavailability of Fe released from the slag was observed to be sufficiently high to promote the maximum growth rate; this was similar to that observed with the reagent inorganic Fe. This implies that the iron released from the slag is a dissolved ferric and/or ferrous ion/hydroxide species. In the culture media, to which the slag was added at the concentration of 20 mg L−1, the slag supplied bioavailable Fe to two diatoms for 50 d. The probable duration for which the slag was available as an Fe source was approximately 10 times longer than the reported duration in in situ iron fertilization experiments. These results indicate that continuous Fe fertilization can be achieved by a single addition of the slag, and hence, we can reduce the energy and cost of ocean fertilization and also create a resource of microalgae biofuels.