Development of chemical exchange saturation transfer at 7 T.

Development of chemical exchange saturation transfer at 7 T.
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化学交换饱和转移在7 t的发展。

DOI:
10.1002/mrm.22862
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发表时间:
2011-09
影响因子:
3.3
通讯作者:
Smith, Seth A.
Smith, Seth A.
中科院分区:
医学3区
文献类型:
--
作者:
Dula, Adrienne N.;Asche, Elizabeth M.;Landman, Bennett A.;Welch, E. Brian;Pawate, Siddharama;Sriram, Subramaniam;Gore, John C.;Smith, Seth A.

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化学交换饱和转移(CEST)MRI是一种分子成像方法,以前已成功报告组织蛋白质和糖原含量和pH值的变化。我们已实施酰胺质子转移(APT),CEST成像的一种特殊形式,在高场(7特斯拉),并使用它来研究健康的人类受试者和多发性硬化症患者。静态场不均匀性的影响使用水饱和度偏移参考方法来减轻,以在逐体素的基础上使每个z谱居中。与在较低场获得的结果相反,在7特斯拉下的APT成像揭示了白色和灰质之间的显著对比,在白色物质内明显具有较高的APT信号。多发性硬化症的初步研究表明,APT不对称性随检查的病变类型而变化。在一些病变中发现相对于健康组织的APT不对称性增加。这些结果表明APT在高场作为白色物质病理学的非侵入性生物标志物的潜在效用,为当前临床使用的其他磁共振成像方法提供补充信息。
Chemical exchange saturation transfer (CEST) MRI is a molecular imaging method that has previously been successful at reporting variations in tissue protein and glycogen contents and pH. We have implemented Amide Proton Transfer (APT), a specific form of CEST imaging, at high field (7 Tesla) and used it to study healthy human subjects and patients with multiple sclerosis. The effects of static field inhomogeneities were mitigated using a water saturation shift referencing method to center each z-spectrum on a voxel-by-voxel basis. Contrary to results obtained at lower fields, APT imaging at 7 Tesla revealed significant contrast between white and gray matter, with a higher APT signal apparent within the white matter. Preliminary studies of multiple sclerosis showed the APT asymmetry varied with the type of lesion examined. An increase in APT asymmetry relative to healthy tissue was found in some lesions. These results indicate the potential utility of APT at high field as a non-invasive biomarker of white matter pathology, providing complementary information to other magnetic resonance imaging methods in current clinical use.
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