Method and apparatus for magnetic resonance imaging
AssigneeSiemens Aktiengesellschaft
InventorDavid Grodzki
Life of this patent
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Abstract
To enable improved magnetic resonance imaging in the vicinity of an interference object that produces a magnetic interference field in an examination region, in a method and apparatus for magnetic resonance imaging of the examination region magnetic resonance raw data are acquired from the examination region by execution of a magnetic resonance sequence having multiple repetition intervals and refocusing of spins in the examination region at the end of each repetition interval repetition intervals. During at least part of the duration of the acquisition of the magnetic resonance raw data, a magnetic compensation gradient is activated that is opposed to the magnetic interference field.
Claims13
A method for magnetic resonance imaging, comprising:
- operating a magnetic resonance scanner to acquire magnetic resonance raw data from an examination region of an examination subject situated in the magnetic resonance scanner, wherein an interference object produces a magnetic interference field in the examination region;
- operating said magnetic resonance scanner to acquire said magnetic resonance raw data by executing a magnetic resonance data acquisition sequence comprising a plurality of repetition intervals and refocusing of nuclear spins in the examination region at an end of each repetition interval and comprising, during at least a portion of a duration of acquisition of said magnetic resonance raw data, activation of a magnetic compensation gradient that is opposed to said magnetic interference field;
- and
- compiling said magnetic resonance raw data in a memory and, via a computer, making the compiled magnetic resonance raw data available from said memory as a datafile in electronic form.
A magnetic resonance apparatus comprising:
- a magnetic resonance scanner;
- a control computer configured to operate said magnetic resonance scanner to acquire magnetic resonance raw data from an examination region of an examination subject situated in the magnetic resonance scanner, wherein an interference object produces a magnetic interference field in the examination region;
- said control computer being configured to operate said magnetic resonance scanner to acquire said magnetic resonance raw data by executing a magnetic resonance data acquisition sequence comprising a plurality of repetition intervals and refocusing of nuclear spins in the examination region at an end of each repetition interval and comprising, during at least a portion of a duration of acquisition of said magnetic resonance raw data, activation of a magnetic compensation gradient that is opposed to said magnetic interference field;
- and
- said control computer being configured to compile said magnetic resonance raw data in a memory and make the compiled magnetic resonance raw data available from said memory as a datafile in electronic form.
A non-transitory, computer-readable data storage medium encoded with programming instructions, said storage medium being loaded into a control computer of a magnetic resonance apparatus that comprises a magnetic resonance scanner, said programming instructions causing said control computer to:
- operate said magnetic resonance scanner to acquire magnetic resonance raw data from an examination region of an examination subject situated in the magnetic resonance scanner, wherein an interference object produces a magnetic interference field in the examination region;
- operate said magnetic resonance scanner to acquire said magnetic resonance raw data by executing a magnetic resonance data acquisition sequence comprising a plurality of repetition intervals and refocusing of nuclear spins in the examination region at an end of each repetition interval and comprising, during at least a portion of a duration of acquisition of said magnetic resonance raw data, activation of a magnetic compensation gradient that is opposed to said magnetic interference field;
- and
- compile said magnetic resonance raw data in a memory and make the compiled magnetic resonance raw data available from said memory as a datafile in electronic form.
Dependencies are inferred from the claim text.