Artifact removal from an electric signal
First Claim
1. A method for suppressing interference in an electrical signal, the method comprising the steps of:
- sampling the electrical signal at a first sampling frequency to obtain a first sequence of samples;
identifying some of the samples in the first sequence of samples on the basis of predetermined criteria; and
downsampling at least the identified samples of said first sequence to obtain a second sequence of samples from the identified samples of said first sequence, the second sequence of samples forming a digital presentation of the electrical signal in which the interference is suppressed.
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Abstract
The invention relates to a method and apparatus for suppressing interference in an electric signal, particularly for suppressing interference in an electrocardiogram (ECG) signal in connection with magnetic resonance imaging (MRI). In order to improve the accuracy of the suppression, the electric signal is first sampled at a high sampling frequency, whereby a first sequence of samples is obtained. Some of the samples in the first sequence of samples are then selected on the basis of predetermined criteria. The first sequence is then downsampled using the selected samples, whereby a second sequence of samples is obtained. The second sequence forms a digital presentation of the electric signal in which the interference is suppressed.
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Citations
24 Claims
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1. A method for suppressing interference in an electrical signal, the method comprising the steps of:
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sampling the electrical signal at a first sampling frequency to obtain a first sequence of samples; identifying some of the samples in the first sequence of samples on the basis of predetermined criteria; and downsampling at least the identified samples of said first sequence to obtain a second sequence of samples from the identified samples of said first sequence, the second sequence of samples forming a digital presentation of the electrical signal in which the interference is suppressed. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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18. An apparatus for suppressing interference in an electrical signal, the apparatus comprising:
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sampling means for sampling the electrical signal at a first sampling frequency to obtain a first sequence of samples; identification means for identifying some of the samples in the first sequence of samples on the basis of predetermined criteria; and downsampling means operatively connected to said identification means for downsampling at least the identified samples of said first sequence to obtain a second sequence of samples from the identified samples of said first sequence and for forming a digital presentation of the electrical signal in which the interference is suppressed from said second sequence of signals. - View Dependent Claims (19, 20, 21, 22, 23, 24)
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Specification