Dynamically variable filter
First Claim
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1. A method of analyzing an input radiofrequency signal sensed from an organ of a subject, comprising:
- processing said input radiofrequency signal to provide a processed input signal, wherein said processing comprises determining a phase shift of said input signal relative to an output radiofrequency signal transmitted to the organ;
filtering said processed signal using a dynamically variable band pass filter, thereby providing a filtered signal; and
using said filtered signal and said phase shift for calculating at least one of;
a stroke volume, a cardiac output, a brain intra luminal blood volume and blood flow;
wherein the method further comprising executing an iterative process to dynamically update an upper frequency bound of said filter in response to a change in a physiological condition of the subject.
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Abstract
A method of processing a signal pertaining to at least one electrical property of an organ of a subject is disclosed. The method comprises determining a physiological condition of the subject, selecting a frequency band, filtering the signal according to the frequency band, and dynamically adapting the frequency band in response to a change in the physiological condition.
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Citations
27 Claims
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1. A method of analyzing an input radiofrequency signal sensed from an organ of a subject, comprising:
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processing said input radiofrequency signal to provide a processed input signal, wherein said processing comprises determining a phase shift of said input signal relative to an output radiofrequency signal transmitted to the organ; filtering said processed signal using a dynamically variable band pass filter, thereby providing a filtered signal; and using said filtered signal and said phase shift for calculating at least one of;
a stroke volume, a cardiac output, a brain intra luminal blood volume and blood flow;wherein the method further comprising executing an iterative process to dynamically update an upper frequency bound of said filter in response to a change in a physiological condition of the subject. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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21. Apparatus for analyzing an input radiofrequency signal sensed from an organ of a subject, comprising:
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an input unit for receiving the input radiofrequency signal; a signal processing circuit configured for processing said input radiofrequency signal to provide a processed input signal, said processing unit comprising a phase shift determinator configured for determining a phase shift of said input signal relative to an output radiofrequency signal transmitted to the organ; a filtering unit configured for filtering said processed signal using a dynamically variable band pass filter, to thereby provide a filtered signal; and a data processor having a circuit configured for applying an iterative process to dynamically update an upper frequency bound of said filter in response to a change in a physiological condition of the subject, and for calculating at least one quantity based on said phase shift, wherein said at least one quantity is selected from the group consisting of a stroke volume, a cardiac output, a brain intra luminal blood volume and blood flow. - View Dependent Claims (22, 23, 24, 25, 26, 27)
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Specification