Saito Moyoko, Hiraga Takashi, Hattori Mineyuki, Murakami Shumei, Nakai Toshiharu
Photonics Research Institute, National Institute of Advanced Industrial Science and Technology, Osaka 563-8577, Japan.
Magn Reson Imaging. 2005 May;23(4):607-10. doi: 10.1016/j.mri.2005.02.004.
In order to establish a continuous hyperpolarized xenon-129 (HP-129Xe) gas delivery system for MR imaging, the effect of the metallic materials in the gas pipeline on the signal intensity was investigated. In the gas pipeline, an appropriate surface is needed to minimize wall relaxation by the HP-129Xe gas caused by the interaction between the HP gas and the surface, which can lead to signal loss. Although Pyrex glass is a popular material for the HP gas chamber, it is fragile under heat or physical stress. In this study, five stainless steel tubes (STs) prepared with different surface film-forming processes were examined. The MR signal intensities of HP-129Xe gas that passed through each tube were then compared. The film passivated by iron fluoride maintained the highest level of hyperpolarization, whereas that passivated by chromium oxide maintained the lowest. A ST with an appropriate passive film may be a useful alternative to a Pyrex glass pipeline.
为了建立用于磁共振成像的连续超极化氙 - 129（HP - 129Xe）气体输送系统，研究了气体管道中金属材料对信号强度的影响。在气体管道中，需要一个合适的表面，以最小化由HP - 129Xe气体与表面之间的相互作用引起的壁弛豫，这可能导致信号损失。尽管派热克斯玻璃是用于HP气体腔室的常用材料，但它在热或物理应力下易碎。在本研究中，检查了通过不同表面成膜工艺制备的五根不锈钢管（STs）。然后比较了通过每根管的HP - 129Xe气体的磁共振信号强度。用氟化铁钝化的膜保持了最高水平的超极化，而用氧化铬钝化的膜保持的超极化水平最低。具有合适钝化膜的不锈钢管可能是派热克斯玻璃管道的有用替代品。
