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Table of contents for the manual
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Page 1
Works-in-Progress package Version 2.0 For the SIEMENS Magnetom under V A21B Installation and User’s Guid e NUMARIS/4A21 April 4t h, 2003 Section of Medic al Ph ysics , Universit y Hospit al Fre iburg, G erm any Contact: Oliver Spec k PhD, H ugstet terstr. 55, D 79106 Fre iburg, em ail: oliver.s peck @uniklin ik-f reiburg.de , phone : +49 7 61 270[...]
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Multi-Echo EPI Page 2 of 9 Numaris/ 4 VA21B Table of Conte nts 1 Basic principl es ................................................................................................. 3 1.1 Principle o f Multi-Echo EPI ........................................................................... 3 1.2 Image c ontras t of Multi- Echo EPI ................[...]
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Multi-Echo EPI Page 3 of 9 Numaris/ 4 VA21B 1 Basic principl es 1.1 Principle of M ulti-Echo EPI The basic ti ming sche me of Multi- Echo EP I is show n in Fig ure 1. It is based on th e orig inal EPI seq uence propos ed by Mans fiel d (1). A fter a sing le RF -ex citation, n complete EPI imag es are acq uired i n a si ngl e shot. Th e phas e gradi[...]
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Multi-Echo EPI Page 4 of 9 Numaris/ 4 VA21B 1.2 Image contrast of Multi-Ec ho EPI The signal intensity of the singl e echo images o f the Multi-Ech o EPI sequenc e is simply given by : *) 2 / exp( 0 T TE S S − = wher e S0 is the signal i ntensity at echo ti me 0, w hich corresponds to the pr oton density for long repe tition ti mes TR , and TE i [...]
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Multi-Echo EPI Page 5 of 9 Numaris/ 4 VA21B 3. O. Speck, T. Ernst , L. Chang . Bi-ex ponentia l modeling of multi gradient ec ho data of the brain. Mag n. Reson. M ed. 45( 6), 111 6-112 1 (2001) 4. O. Speck, J. Hennig. Motion Correction of Parametric fMRI Da ta from Mu lti- Slice Sing le-Sho t Mult i-Echo Acq uisitions, M agn. Reson . Med. 4 6(5): [...]
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Multi-Echo EPI Page 6 of 9 Numaris/ 4 VA21B[...]
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Multi-Echo EPI Page 7 of 9 Numaris/ 4 VA21B 3 Sequen ces an d Pro tocol s 3.1 General Remark s Since the sequenc e i s deriv ed fro m the s tand ard EP I seq uence, most o f the user inter face and featur es ar e identical to this method . Due t o the lar ge number o f imag es created in a shor t time, the i mages are sav ed to the d atabase in t h[...]
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Multi-Echo EPI Page 8 of 9 Numaris/ 4 VA21B Separate Correction : In the so urce c ode o f the sequ ence car d a n ew parameter ‘Separa te Corr ection’ has be en intr oduc ed. I f this para meter is enabl ed (duri ng compilati on) each echo i mage is preceded by a new set o f navi gators us ed for th e Nyqui st ghost corr ection by the r econst[...]
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Multi-Echo EPI Page 9 of 9 Numaris/ 4 VA21B t-Test : The online t-test and di splay w ork as in the ori ginal EPI sequence. How ev er, the t-test only works properly when motion correction is select ed ! Altern atively, T2*-Maps can be proc essed w ithin the B OLD -card. 3.3 Remarks on reconstr ucti on perf orma nce The number of imag es that c an [...]