کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
5407108 1393203 2009 7 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Resolution enhancement in MRI of laser polarized 3He by control of diffusion
موضوعات مرتبط
مهندسی و علوم پایه شیمی شیمی تئوریک و عملی
پیش نمایش صفحه اول مقاله
Resolution enhancement in MRI of laser polarized 3He by control of diffusion
چکیده انگلیسی
Diffusion of atoms or molecules in presence of magnetic field gradients not only attenuates the NMR signal but also leads to distortions close to restricting boundaries. This phenomenon is most evident in imaging with laser polarized (LP) noble gases. Diffusion of gases can be manipulated, however, by admixing inert gases of different molecular weight. In this work we analyze the effect of mixing LP-3He with SF6 on the image quality of a phantom consisting of an arrangement of capillaries with different diameters. Admixing buffer gases of higher molecular weight changes the contrast and offers a means to record images with high spatial and time resolution. Additionally we demonstrate how distortions due to edge enhancement can be reduced even for long timed MRI-sequences.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Magnetic Resonance - Volume 197, Issue 1, March 2009, Pages 56-62
نویسندگان
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