Hyperpolarized lithium-6 as a sensor of nanomolar contrast agents.

Hyperpolarized lithium-6 as a sensor of nanomolar contrast agents.
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DOI:
10.1002/mrm.21952
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发表时间:
2009-06
影响因子:
3.3
通讯作者:
Gruetter, Rolf
Gruetter, Rolf
中科院分区:
医学3区
文献类型:
--
作者:
van Heeswijk, Ruud B.;Uffmann, Kai;Comment, Arnaud;Kurdzesau, Fiodar;Perazzolo, Chiara;Cudalbu, Cristina;Jannin, Sami;Konter, Jacobus A.;Hautle, Patrick;van den Brandt, Ben;Navon, Gil;van der Klink, Jacques J.;Gruetter, Rolf

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锂被广泛用于心理治疗。6Li同位素具有很长的内在纵向弛豫时间T1,大约为分钟,使其成为超极化实验的理想候选者。在本研究中,我们证明了锂-6可以在30分钟内容易地超极化,同时保持一分钟量级的长极化衰减时间。我们使用固有的长弛豫时间用于体外检测500 nM造影剂。将超极化锂-6施用于大鼠,并且其信号在体内保持约70 s的衰减时间。定位实验表明,锂信号起源于脑内,并且在给药后5分钟内可检测到。我们的结论是,使用超极化核磁共振核,如6Li的亚微摩尔造影剂的检测可能提供了一种新的途径分子成像。
Lithium is widely used in psychotherapy. The 6Li isotope has a long intrinsic longitudinal relaxation time T1 on the order of minutes, making it an ideal candidate for hyperpolarization experiments. In the present study, we demonstrated that lithium-6 can be readily hyperpolarized within 30 min, while retaining a long polarization decay time on the order of a minute. We used the intrinsically long relaxation time for the detection of 500 nM contrast agent in vitro. Hyperpolarized lithium-6 was administered to the rat and its signal retained a decay time on the order of 70 s in vivo. Localization experiments imply that the lithium signal originated from within the brain and that it was detectable up to 5 min after administration. We conclude that the detection of sub-micromolar contrast agents using hyperpolarized NMR nuclei such as 6Li may provide a novel avenue for molecular imaging.
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