Method and apparatus for non-invasive assessment of ripple cancellation filter

A ripple elimination and filter technology, applied in the field of noise filtering
CN107110936AActive Publication Date: 2017-08-29GENERAL ELECTRIC CO
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Patent Information

Authority / Receiving Office
CN Β· China
Current Assignee / Owner
GENERAL ELECTRIC CO
Publication Date
2017-08-29

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Abstract

A method that includes deriving a first power spectral density function of a signal input to a ripple cancellation filter; deriving a second power spectral density function of a signal concurrently output from the ripple cancellation filter; frequency shaping the first power spectral density according to a spectral rejection image of the ripple cancellation filter to obtain a test power spectral density; and indicating a degraded performance of the ripple cancellation filter in the event that the test and second power spectral density functions fail to match within pre-determined criteria.
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Description

[0001] Cross References to Related Applications

[0002] This application claims priority to US Patent Application No. 14 / 585554, filed December 30, 2014, which is incorporated herein by reference in its entirety. Background technique

[0003] Embodiments of the invention generally relate to noise filtering in imaging systems. Particular embodiments relate to filtering gradient coil power amplifier noise in a magnetic resonance imaging (MRI) system.

[0004] Typically, the quality of images produced by an MRI system will be affected by the repeatability and fidelity of its electronic components. In particular, the gradient subsystem power amplifier strongly affects the fidelity with which the scan volume is voxellated (scanned in volume segments of equal size and common orientation). For example, power amplifier ripple or steering can degrade the expected uniformity of voxel size and orientation.

[0005] Accordingly, MRI systems are provided with means for correcting image...

Claims

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