Optimization of the noise development of a 3d gradient echo sequence in a magnetic resonance system
AssigneeSiemens Aktiengesellschaft
InventorsDavid Grodzki, Vladimir Jellus
Life of this patent
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Abstract
In a method according to optimize the noise development of a 3D gradient echo sequence in a magnetic resonance system, an optimization of at least one parameter of the gradient echo sequence, from the group including: the excitation pulse (the duration of the excitation pulse); the order of k-space lines to be scanned in k-space; and the readout direction of the k-space lines to be scanned in k-space, is implemented such that the gradients to be switched have optimally minimal slew rates, amplitudes and/or polarity changes.
Claims12
A computerized method to optimize noise development that occurs in a magnetic resonance apparatus operated with a 3D gradient echo sequence comprising:
- providing a computerized processor with a 3D gradient echo sequence that comprises an excitation pulse and a plurality of activated magnetic field gradients, including a readout gradient that, when activated, causes magnetic resonance data to be read out and entered into a memory organized as k-space along k-space lines, said gradient being activated with respective slew rates, amplitudes and polarity changes;
- in said computerized processor, automatically optimizing at least one parameter of said 3D gradient echo sequence selected from the group consisting of said excitation pulse, an order of entry of data into said k-space lines of k-space, and said readout direction, to cause said gradient to be activated with at least one of optimally minimal slew rates, optimally minimal amplitudes, and optimally minimal polarity changes to produce an optimized gradient echo sequence;
- and
- making said optimized gradient echo sequence available at an output of said processor in electronic form with a format for operating said magnetic resonance apparatus.
A magnetic resonance apparatus comprising:
- a magnetic resonance data acquisition unit;
- a memory organized as k-space;
- a computerized processor provided with a 3D gradient echo sequence that comprises an excitation pulse and a plurality of activated magnetic field gradients, including a readout gradient that, when activated, causes magnetic resonance data to be read out and entered into said memory organized as k-space along k-space lines, said gradient being activated with respective slew rates, amplitudes and polarity changes;
- said computerized processor being configured to automatically optimize at least one parameter of said 3D gradient echo sequence selected from the group consisting of said excitation pulse, an order of entry of data into said k-space lines of k-space, and said readout direction, to cause said gradient to be activated with at least one of optimally minimal slew rates, optimally minimal amplitudes, and optimally minimal polarity changes to produce an optimized gradient echo sequence;
- and
- said computerized processor being configured to operate said data acquisition unit with said optimized gradient echo sequence.
A non-transitory, computer-readable data storage medium encoded with programming instructions, said storage medium being loaded into a computerized control and evaluation computer of a magnetic resonance apparatus, that also comprises a magnetic resonance data acquisition unit, and said programming instructions causing said computer to:
- receive a computerized processor with a 3D gradient echo sequence that comprises an excitation pulse and a plurality of activated magnetic field gradients, including a readout gradient that, when activated, causes magnetic resonance data to be read out and entered into a memory organized as k-space along k-space lines, said gradient being activated with respective slew rates, amplitudes and polarity changes;
- automatically optimize at least one parameter of said 3D gradient echo sequence selected from the group consisting of said excitation pulse, an order of entry of data into said k-space lines of k-space, and said readout direction, to cause said gradient to be activated with at least one of optimally minimal slew rates, optimally minimal amplitudes, and optimally minimal polarity changes to produce an optimized gradient echo sequence;
- and
- operate said data acquisition unit with said optimized gradient echo sequence.
Dependencies are inferred from the claim text.