Magnetic reasonance tomography apparatus and method in the form of a pulse sequence for operating same
First Claim
1. A method for rapidly obtaining image data in magnetic resonance tomography comprising the steps of:
- subjecting an examination subject to a pulse sequence which causes a nuclear magnetization vector within said examination subject to oscillate between angles ±
α
in a steady state, wherein α
is less than 90°
;
in said pulse sequence, emitting a bipolar readout gradient, including a positive half and a negative half, and reading out nuclear magnetic resonance signals from said examination subject during said bipolar readout gradient; and
in said pulse sequence, emitting at least one RF excitation pulse during each negative half of said bipolar readout gradient.
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Abstract
In a method in the form of a pulse sequence for ultra-rapid nuclear magnetic resonance tomography and a magnetic resonance tomography apparatus operating according to the method, image data are obtained in a pulse sequence wherein the magnetization vector oscillates by an angle ±α in the steady stage, with a being smaller then 90°. This is the case, for example, given a SSFP sequence. RF pulse train composed of a number of RF pulses is respectively emitted during one-half of a readout gradient. A bipolar readout gradient pulse train can be employed, with an RF pulse train being emitted during a negative half of the readout gradient pulse train.
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Citations
14 Claims
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1. A method for rapidly obtaining image data in magnetic resonance tomography comprising the steps of:
-
subjecting an examination subject to a pulse sequence which causes a nuclear magnetization vector within said examination subject to oscillate between angles ±
α
in a steady state, wherein α
is less than 90°
;
in said pulse sequence, emitting a bipolar readout gradient, including a positive half and a negative half, and reading out nuclear magnetic resonance signals from said examination subject during said bipolar readout gradient; and
in said pulse sequence, emitting at least one RF excitation pulse during each negative half of said bipolar readout gradient. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A magnetic resonance tomography apparatus comprising:
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a scanner having an RF coil and at least one gradient coil for subjecting an examination subject to a pulse sequence which causes a nuclear magnetization vector within said examination subject to oscillate between angles ±
α
in a steady state, wherein α
is less than 90°
;
a controller connected to said at least one gradient coil for producing, in said pulse sequence, a bipolar readout gradient, including a positive half and a negative half, for reading out nuclear magnetic resonance signals from said examination subject during said bipolar readout gradient; and
said controller being connected to said RF coil for producing, in said pulse sequence, emitting at least one RF excitation pulse during each negative half of said bipolar readout gradient. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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Specification