Development of chemical exchange saturation transfer at 7 T.
Development of chemical exchange saturation transfer at 7 T.
复制标题
化学交换饱和转移在7 t的发展。
DOI:
10.1002/mrm.22862
复制
发表时间:
2011-09
影响因子:
3.3
通讯作者:
Smith, Seth A.
中科院分区:
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.
关键词:
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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