Magnetic resonance apparatus employing delayed self-refocusing RF excitation
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United States of America Patent
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Jan 18, 1994
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app pub date -
Jul 27, 1992
filing date -
Jul 27, 1992
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Abstract
MRI Apparatus for obtaining a spin-echo signal applies a self-refocusing RF pulse with variable delay in the spin-echo signals following application of the RF pulse. The RF pulse is designed using the Shinnar-LeRoux algorithm B.sub.1 (t)=SLR.sup.-1 {A.sub.n (z), B.sub.n (z) } with A.sub.n '(z) substituted for A.sub.n (z). A.sub.n '(z) is slightly non-minimum phase and equals P(z) A.sub.n (z) where P(z) is a unit amplitude phase function chosen to compensate the phase of B.sub.n (z). The RF pulse can be designed for a specific delay, a specific power constraint, and small tip angle.
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