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 position of the magnetic resonance signal is determined. Based on this phase position, 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, generating a radio-frequency field having a field strength associated therewith by emitting at least one radio-frequency pulse from said antenna, and thereby causing an examination subject in said radio-frequency field to emit a magnetic resonance signal;
- receiving said magnetic resonance signal;
- and
- determining a phase position of said magnetic resonance signal and, from said phase position, determining said field strength.
A magnetic resonance examination apparatus comprising:
- a magnetic resonance scanner adapted to receive a subject therein, said magnetic resonance scanner having a radio-frequency antenna;
- a control computer for operating 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 produce a radio-frequency field, having a field strength, by emitting at least one radio-frequency pulse from said radio-frequency antenna and thereby exciting a magnetic resonance signal from said subject, for acquiring said magnetic resonance signal, for determining a phase position of said magnetic resonance signal, and for determining said field strength from said phase position.
A computer program product loadable into a control computer of magnetic resonance examination apparatus having a radio-frequency antenna operated by said control computer, said computer program product running in said control computer and causing said control computer to:
- operate said antenna to produce a radio-frequency field, having a field strength, by emitting at least one radio-frequency pulse, and thereby exciting a magnetic resonance signal in a subject in said field;
- to acquire said magnetic resonance signal;
- and
- to determine a phase position of said magnetic resonance signal and to determine said field strength from said phase position.
Dependencies are inferred from the claim text.