کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
9587279 | 1393231 | 2005 | 13 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Multiple-quantum vector field imaging by magnetic resonance
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
شیمی
شیمی تئوریک و عملی
پیش نمایش صفحه اول مقاله
![عکس صفحه اول مقاله: Multiple-quantum vector field imaging by magnetic resonance Multiple-quantum vector field imaging by magnetic resonance](/preview/png/9587279.png)
چکیده انگلیسی
We introduce a method for non-invasively mapping fiber orientation in materials and biological tissues using intermolecular multiple-quantum coherences. The nuclear magnetic dipole field of water molecules is configured by a CRAZED sequence to encode spatial distributions of material heterogeneities. At any given point r in space, we obtain the spherical coordinates of fiber orientation (θ,Ï) with respect to the external field by comparing three signals â¥GXâ¥, â¥GYâ¥, and â¥GZ⥠(modulus), acquired with linear gradients applied along the X, Y, and Z axes, respectively. For homogeneous isotropic materials, a subtraction â¥GZâ¥Â â â¥GXâ¥Â â â¥GY⥠gives zero. With anisotropic materials, we find an empirical relationship relating â¥GZâ¥Â â â¥GXâ¥Â â â¥GYâ¥/(â¥GXâ¥Â + â¥GYâ¥Â + â¥GZâ¥) to the polar angle θ, while â¥GXâ¥Â â â¥GYâ¥/(â¥GXâ¥Â + â¥GYâ¥Â + â¥GZâ¥) is related to the azimuthal angle Ï. Experiments in structured media confirm the structural sensitivity. This technique can probe length scales not accessible by conventional MRI and diffusion tensor imaging.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Magnetic Resonance - Volume 177, Issue 1, November 2005, Pages 9-21
Journal: Journal of Magnetic Resonance - Volume 177, Issue 1, November 2005, Pages 9-21
نویسندگان
Louis-S. Bouchard, Warren S. Warren,