System and method for real-time frequency correction for magnetic resonance imaging
First Claim
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1. A method for estimating frequency-drift errors in a magnetic resonance signal acquired with a magnetic resonance imaging (MRI) system, the steps of the method comprising:
- a) acquiring data with the MRI system by directing the MRI system to perform a pulse sequence that samples multiple echo signals in each repetition time (TR) period;
b) selecting reference data from the acquired data using a computer system;
c) computing with the computer system, phase offset values based on the acquired data and the selected reference data, wherein the phase offset values are related to a frequency drift in data acquired during a given TR period relative to the selected reference data; and
d) estimating with the computer system, a frequency drift value from the computed phase offset values.
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Abstract
Systems and methods for estimating frequency drifts in magnetic resonance signals acquired with a magnetic resonance imaging (“MRI”) system are provided. In one example, the frequency drifts are estimated from phase-correction data that are obtained during an echo-planar imaging (“EPI”), or other multiecho imaging, scan. The systems and methods of the present invention provide for efficiently and accurately computing frequency drift values that can be used for real-time, prospective frequency drift correction.
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13 Claims
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1. A method for estimating frequency-drift errors in a magnetic resonance signal acquired with a magnetic resonance imaging (MRI) system, the steps of the method comprising:
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a) acquiring data with the MRI system by directing the MRI system to perform a pulse sequence that samples multiple echo signals in each repetition time (TR) period; b) selecting reference data from the acquired data using a computer system; c) computing with the computer system, phase offset values based on the acquired data and the selected reference data, wherein the phase offset values are related to a frequency drift in data acquired during a given TR period relative to the selected reference data; and d) estimating with the computer system, a frequency drift value from the computed phase offset values. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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