US 8,274,286 B2 · System and method for multi-spectral MR imaging near metal

Abstract

A system and method for multi-spectral MR imaging near metal include a computer programmed to calculate an MR pulse sequence comprising a plurality of RF pulses configured to excite spins in an imaging object and comprising a plurality of volume selection gradients and determine a plurality of distinct offset frequency values. For each respective determined offset frequency value, the computer is programmed to execute the MR pulse sequence having a central transmit frequency and a central receive frequency of the MR pulse sequence set to the respective determined offset frequency value. The computer is also programmed to acquire a three-dimensional (3D) MR data set for each MR pulse sequence execution and generate a composite image based on data from each of the acquired 3D MR data sets.

Claims20

Dependent claims

A magnetic resonance (MRI) apparatus comprising:

an MRI system having a plurality of gradient coils positioned about a bore of a magnet, and an RF transceiver system and an RF switch controlled by a pulse module to transmit RF signals to an RF coil assembly to acquire MR images;
and
a computer programmed to:
calculate an MR pulse sequence comprising a plurality of RF pulses configured to excite spins in an imaging object and comprising a plurality of volume selection gradients;
determine a plurality of distinct offset frequency values;
for each respective determined offset frequency value, execute the MR pulse sequence having a central transmit frequency and a central receive frequency of the MR pulse sequence set to the respective determined offset frequency value;
acquire a three-dimensional (3D) MR data set for each MR pulse sequence execution;
and
generate a composite image based on data from each of the acquired 3D MR data sets.

6 more elements

A method of magnetic resonance (MR) imaging comprising:

calculating a plurality of 3D MR data acquisitions, each 3D MR data acquisition comprising:
a plurality of RF pulses configured to excite spins in an imaging object;
and
a plurality of volume selection gradients;
determining a distinct central frequency for each of the plurality of 3D MR data acquisitions;
performing the plurality of 3D MR data acquisitions, each 3D MR data acquisition having a central transmit frequency and a central receive frequency set to the distinct central frequency determined therefor;
and
generating a composite image from the plurality of 3D MR data acquisitions.

5 more elements

A non-transitory computer readable storage medium having stored thereon a computer program comprising instructions which when executed by a computer cause the computer to:

calculate a first 3D MR acquisition comprising a plurality of RF pulses configured to excite spins in an imaging object and comprising a plurality of volume selection gradients;
set a center transmission frequency and a center reception frequency of the first 3D MR acquisition equal to a first center frequency offset;
execute the first 3D MR acquisition to acquire a first set of 3D MR data;
calculate a second 3D MR acquisition comprising a plurality of RF pulses configured to excite spins in an imaging object and comprising a plurality of volume selection gradients;
set a center transmission frequency and a center reception frequency of the second 3D MR acquisition equal to a second center frequency offset different than the first center frequency offset;
execute the second 3D MR acquisition to acquire a second set of 3D MR data;
and
reconstruct a composite image based on the first and second sets of 3D MR data.

5 more elements

Dependencies are inferred from the claim text.

System and method for multi-spectral MR imaging near metal

Life of this patent

System and method for multi-spectral MR imaging near metal

Life of this patent

Abstract

Claims20