DYNAMICALLY VARIABLE FILTER
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Accused Products
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.
87 Citations
46 Claims
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1-8. -8. (canceled)
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9. 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 adapted in response to a change in a physiological condition of the subject and being characterized by an upper frequency bound which is determined using an iterative process, 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. - View Dependent Claims (11, 13, 15, 16, 17, 22, 23, 24, 25, 26, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38)
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10. (canceled)
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12. (canceled)
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14. (canceled)
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18-19. -19. (canceled)
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20. 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 unit 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 adapted in response to a change in a physiological condition of the subject and being characterized by an upper frequency bound which is determined using an iterative process, to thereby provide a filtered signal; and a data processor 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 (42, 43, 46)
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21. (canceled)
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27. (canceled)
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39-41. -41. (canceled)
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44-45. -45. (canceled)
Specification