Method for determining the B1 field strength in MR measurements
AssigneeSiemens Aktiengesellschaft
InventorThorsten Feiweier
Life of this patent
Estimating the term…
Abstract
In magnetic resonance tomography apparatus and method for determining the field strength of high-frequency pulses which are emitted during a magnetic resonance measurement by the antenna, a magnetic resonance signal excited by a radio-frequency pulse or a radio-frequency pulse sequence is measured, and a phase of the magnetic resonance signal is determined. Based on this phase, the field strength is then determined.
Claims19
A method for determining a field strength of radio-frequency energy emitted during a magnetic resonance measurement, comprising the steps of:
- from an antenna of a magnetic resonance examination apparatus, emitting at least one radio-frequency pulse from said antenna to generate an antenna-emitted radio-frequency field having a field strength, and thereby causing an examination subject in said radio-frequency field to emit a magnetic resonance signal;
- receiving said magnetic resonance signal;
- determining a phase of said received magnetic resonance signal;
- and,
- from said determined phase, determining said field strength, of said antenna-emitted radio-frequency field.
A magnetic resonance examination apparatus comprising:
- a magnetic resonance scanner configured to receive a subject therein, said magnetic resonance scanner having a radio-frequency antenna;
- a control computer that operates said magnetic resonance scanner, including operating said radio-frequency antenna;
- and
- said control computer operating said magnetic resonance scanner and said radio-frequency antenna to emit at least one radio-frequency pulse from said radio-frequency antenna in order to generate an antenna-emitted radio-frequency field having a field strength, and thereby exciting a magnetic resonance signal from said subject, and in order to acquire said excited magnetic resonance signal, said control computer determining a phase of said acquired magnetic resonance signal, and determining said field strength of said antenna-emitted radio-frequency field from said determined phase.
A computer readable medium encoded with a computer program loadable into a control computer of a magnetic resonance examination apparatus having a radio-frequency antenna operated by said control computer, said computer program running in said control computer and causing said control computer to:
- operate said antenna to emit at least one radio-frequency pulse from said radio-frequency antenna in order to generate an antenna-emitted radio-frequency field having a field strength, and thereby exciting a magnetic resonance signal in a subject in said field;
- acquire said magnetic resonance signal;
- and
- determine a phase of said acquired magnetic resonance signal and determine said field strength of said antenna-emitted radio-frequency field from said determined phase.
Dependencies are inferred from the claim text.