MRI-2-imaging - 1 Magnetic Resonance Imaging Magnetic...

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Unformatted text preview: 10/28/2010 1 Magnetic Resonance Imaging Magnetic Resonance Imaging Image Formation Image Formation Xin Yu, Sc.D. Department of Biomedical Engineering EBME410, Xin Yu, Sc.D. Case Western Reserve University 1 H (m=±½) m=+½ m=-½ Magnetic Resonance Magnetic Resonance Imaging Imaging m=+½ B x z EBME410, Xin Yu, Sc.D. y B 1 : frequency Larmor B L 10/28/2010 2 The Free Induction Decay The Free Induction Decay 90 90 o RF RF B z t i xy xy e M t M ) ( ) ( ) ( ) ( ) ( ) ( ) ( / * 2 e e M t M t iM t M t M T t t i xy xy y x xy y x B 1 EBME410, Xin Yu, Sc.D. relaxation Transverse : condition Initial : ) ( 2 T M xy 180 180 o 90 90 o Spin Spin-Echo Echo B M ) ( / / * 2 2 e e e M t M t i T t T TE xy RF RF TE/2 TE/2 EBME410, Xin Yu, Sc.D. ) ( H M 10/28/2010 3 B M 180 180 o 90 90 o RF RF TE TE M 1 t i T t T TE xy e e e M M t M * 2 2 / / 1 ) ( ) ( ) ( ) ( , gradient With ' x G...
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MRI-2-imaging - 1 Magnetic Resonance Imaging Magnetic...

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