System and method for phase offset and time delay correction in magnetic resonance spectroscopy data
First Claim
1. A method for producing a spectrum with a magnetic resonance imaging (MRI) system, the steps comprising:
- a) exciting, with the MRI system, a volume of interest;
b) acquiring, with the MRI system, a spectroscopic data set from the volume of interest;
c) transforming the spectroscopic data set to produce a spectrum;
d) determining a correction factor using temporal information from the spectroscopic data set that includes a zero time indicative of a time at which a signal is first emitted from the volume of interest following the excitation in step a) and a time delay between the zero time and a time at which the signal is detected by the MRI system in step b); and
e) applying the correction factor to the spectrum produced in step c) to correct for errors attributable to phase and time shifts in the spectroscopic data set acquired in step b).
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Abstract
A method is provided for producing, with a magnetic resonance (MR) system, a nuclear magnetic resonance spectrum that has been corrected for errors arising from phase offsets and time shifts in the acquired spectroscopic data. A spectroscopic data set includes temporal information indicative of the underlying phase offsets and time shifts. In general, this temporal information is utilized to correct for errors in the acquired data. As a result, a plurality of acquired spectroscopic data sets are more accurately combined by first individually correcting each spectroscopic data set for such errors. Exemplary sources of the phase offsets and time shifts include the physical separation between a volume of interest and the detectors in the MRI system. Using the temporal information, T2 decay in the produced spectrum is also corrected.
10 Citations
18 Claims
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1. A method for producing a spectrum with a magnetic resonance imaging (MRI) system, the steps comprising:
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a) exciting, with the MRI system, a volume of interest; b) acquiring, with the MRI system, a spectroscopic data set from the volume of interest; c) transforming the spectroscopic data set to produce a spectrum; d) determining a correction factor using temporal information from the spectroscopic data set that includes a zero time indicative of a time at which a signal is first emitted from the volume of interest following the excitation in step a) and a time delay between the zero time and a time at which the signal is detected by the MRI system in step b); and e) applying the correction factor to the spectrum produced in step c) to correct for errors attributable to phase and time shifts in the spectroscopic data set acquired in step b). - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
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Specification