| 摘要 |
In a method a magnetic resonance apparatus for generating at least two essentially parallel two-dimensional image data sets of an examination object by operation of a magnetic resonance scanner having a multi-coil array, a multiband radiofrequency pulse is radiated for exciting at least two slices, that are phase encoded by applying a phase encoding gradient. Scan signals produced by the excited slices are detected using each coil of the multi-coil array. In one of the excitation or the phase encoding, the phase of the scan signal in at least one slice to be modulated at least once such that the phase of the scan signal is different from the phase of the other slices. Image data sets are reconstructed as a function of the modulation of the phase of the scan signal in at least one slice and, in at least one slice, the multiband radiofrequency pulse has an amplitude and/or duration and/or pulse shape that is different from the other slice or the other slices. |
| 主权项 |
1. A method for generating at least two essential parallel two-dimensional image data sets of an examination object by operation of a magnetic resonance data having a multi-coil array and a gradient coil arrangement, said method comprising:
(a) operating said multi-coil array to radiate a multiband radiofrequency pulse while the examination object is situated in the magnetic resonance scanner, and thereby exciting nuclear spins in at least two slices, thereby causing magnetic resonance signals to be emitted from said at least two slices; (b) operating the gradient coil arrangement to activate a phase encoding gradient that phase encodes said at least two slices and thus phase encodes said MR signals; (c) operating said gradient coil arrangement and said multi-coil array to read out the MR signals from said at least two slices, using each coil of said multi-coil array to receive said MR signals; (d) operating said magnetic resonance scanner to modulate a phase of said MR signals in one of (a) or (b) in at least one of said at least two slices, thereby making the modulated phase of said MR signals of said at least one of said at least two slices different from the phase of MR signals from all other slices of the examination object; (e) operating said multi-coil array, in at least one sequence of (a), (b) and (c), to give said multiband radiofrequency pulse, in at least one slice of said at least two slices, at least one of an amplitude that differs from an amplitude in other slices, a pulse shape that differs from a pulse shape in other slices, and a deflection angle that differs from a deflection angle in other slices by an amount other than 180°; and (f) providing said MR signals to a computer and, in said computer, executing an image reconstruction algorithm to reconstruct an image of said at least two slices of the examination subject depending on said modulation of said phase of said MR signals in said at least one slice of said at least two slices. |
