کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1807245 1025250 2009 6 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Image correction during large and rapid B0 variations in an open MRI system with permanent magnets using navigator echoes and phase compensation
موضوعات مرتبط
مهندسی و علوم پایه فیزیک و نجوم فیزیک ماده چگال
پیش نمایش صفحه اول مقاله
Image correction during large and rapid B0 variations in an open MRI system with permanent magnets using navigator echoes and phase compensation
چکیده انگلیسی

An open permanent magnet system with vertical B0 field and without self-shielding can be quite susceptible to perturbations from external magnetic sources. B0 variation in such a system located close to a subway station was measured to be greater than 0.7 μT by both MRI and a fluxgate magnetometer. This B0 variation caused image artifacts. A navigator echo approach that monitored and compensated the view-to-view variation in magnetic resonance signal phase was developed to correct for image artifacts. Human brain imaging experiments using a multislice gradient-echo sequence demonstrated that the ghosting and blurring artifacts associated with B0 variations were effectively removed using the navigator method.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Magnetic Resonance Imaging - Volume 27, Issue 7, September 2009, Pages 988–993
نویسندگان
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