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

A ripple elimination and filter technology, applied in the field of noise filtering

Active Publication Date: 2017-08-29
GENERAL ELECTRIC CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

For example, power amplifier ripple or steering can degrade the expected consistency of voxel size and orientation

Method used

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

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Embodiment Construction

[0021] Reference will hereinafter be made in detail to exemplary embodiments of the invention, examples of which are illustrated in the accompanying drawings. Wherever possible, the same reference characters used throughout the drawings denote the same or like parts without repeated description. Although exemplary embodiments of the present invention are described with respect to an MRI system for clarity of illustration, in general embodiments of the present invention are also applicable to evaluating the performance of ripple cancellation filters in real time.

[0022] As used herein, the terms "substantially", "generally" and "approximately" indicate reasonably achievable manufacturing and assembly tolerances relative to ideal expected conditions suitable for achieving the functional purpose of the component or assembly conditions within the limits. The term "real time" means substantially concurrent with and responsive to an ongoing process, ie capable of providing a feed...

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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.

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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Application Information

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IPC IPC(8): G01R33/385
CPCG01R33/3852G01R33/38
Inventor L.弗里戈M.弗里曼M.维扎D.林克M.罗斯S.韦伯A.帕诺斯
Owner GENERAL ELECTRIC CO
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