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US 2015/0309139 A1Published application
Method and magnetic resonance apparatus for slice-selective magnetic resonance imaging
AssigneeSiemens Aktiengesellschaft
InventorsTheresa Bachschmidt, Dominik Paul
Life of this patent
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Abstract
In a method and magnetic resonance apparatus for slice-selective magnetic resonance imaging, read partitions in a cyclical sequence of slices are read out. At least two slices have a different number of read partitions. The same predefined number of read partitions for the slices is read out in all cycles of the sequence. SEMAC techniques are used.
Claims20
A method for slice-selective magnetic resonance (MR) imaging of a plurality of slices of an examination subject, comprising:
- from a control computer, operating an MR scanner, while an examination subject is situated in the MR scanner, to slice-selectively acquire MR data from each of a plurality of slices of the examination subject, wherein slices in said plurality of slices are respective adjacent to each other along a first direction and extend perpendicularly to said first direction;
- from said control computer, operating said MR scanner to acquire said MR data from said plurality of slices in a plurality of read partitions in each slice, the read partitions of each slice being adjacent to each other along said first direction, and at least two slices in said plurality of slices having a different number of said read partitions;
- from said control computer, operating said MR scanner to read out MR data in said read partitions in a cyclical sequence of the slices in said plurality of slices with successive read-out read partitions respective being in different slices, and maintaining a minimum repetition time between sequential readout of respective read partitions of a same slice and wherein a same predetermined number of read partitions is read out in each cycle of said cyclical sequence, and with said cyclical sequence comprising at least two sub-sequences that differ from each other with respect to one of said slices in said plurality of slices;
- and
- providing said MR data to an image reconstruction computer and, in said image reconstruction computer, reconstructing an MR image for each slice from the MR data of the read partitions of that respective slice and MR data of read partitions of other slices in said plurality of slices.
2 more elements
A magnetic resonance (MR) apparatus comprising:
- an MR scanner;
- a control computer configured to operate said MR scanner, while an examination subject is situated in the MR scanner, to slice-selectively acquire MR data from each of a plurality of slices of the examination subject, wherein slices in said plurality of slices are respective adjacent to each other along a first direction and extend perpendicularly to said first direction;
- said control computer being configured to operate said MR scanner to acquire said MR data from said plurality of slices in a plurality of read partitions in each slice, the read partitions of each slice being adjacent to each other along said first direction, and at least two slices in said plurality of slices having a different number of said read partitions;
- said control computer being configured to operate said MR scanner to read out MR data in said read partitions in a cyclical sequence of the slices in said plurality of slices with successive read-out read partitions respective being in different slices, and to maintain a minimum repetition time between sequential readout of respective read partitions of a same slice, and to read out a same predetermined number of read partitions in each cycle of said cyclical sequence, and with said cyclical sequence comprising at least two sub-sequences that differ from each other with respect to one of said slices in said plurality of slices;
- and
- a reconstruction computer provided with said MR data, said image reconstruction computer being configured to reconstruct an MR image for each slice from the MR data of the read partitions of that respective slice and MR data of read partitions of other slices in said plurality of slices.
3 more elements
A method for slice-selective magnetic resonance (MR) imaging of a plurality of slices of an examination subject, comprising:
- from a control computer, operating an MR scanner, while an examination subject is situated in the MR scanner, to slice-selectively acquire MR data from each of a plurality of slices of the examination subject, wherein slices in said plurality of slices are respective adjacent to each other along a first direction and extend perpendicularly to said first direction;
- from said control computer, operating said MR scanner to acquire said MR data from said plurality of slices in a plurality of read partitions in each slice, the read partitions of each slice being adjacent to each other along said first direction, and at least two slices in said plurality of slices having a different number of said read partitions;
- from said control computer, prescribing a cyclical sequence for acquiring said MR data from respective slices in said plurality of slices, wherein MR data are acquired from at most one read partition per slice in each cycle, with a different number of read partitions being read out in at least two cycles of said cyclical sequence, with dead times occurring during within said cyclical sequence;
- in said control computer, re-sorting the prescribed cyclical sequence to reduce said dead times, thereby obtaining a re-sorted sequence;
- and
- from said control computer, operating said MR scanner to read out said MR data from said read partitions for said different slices according to said re-sorted sequence.
3 more elements
Dependencies are inferred from the claim text.