CLINICAL APPLICATIONS FOR ELECTRICAL TOMOGRAPHY DERIVED METRICS

• US 20090326397A1
• Filed: 06/26/2009
• Published: 12/31/2009
• Est. Priority Date: 06/27/2008
• Status: Abandoned Application

• Current Assignee: Proteus Biomedical, Inc. (Otsuka Holdings Company Limited)
• Original Assignee: Proteus Biomedical, Inc. (Otsuka Holdings Company Limited)
• Inventors: Moon, Gregory, Behzadi, Yashar, Robertson, Timothy, Colliou, Olivier
• Application Number:
  US12/492,672
• Publication Number:
  US 20090326397A1
• Time in Patent Office: Days
• US Class Current: 600/508
• CPC Class Codes: A61B 5/05 Detecting, measuring or recording for diagnosis by means of electric currents or magnetic fields; Measuring using microwaves or radio waves impedance plethysmography A61B5/0295; measuring movement of the entire body or parts thereof A61B5/11; detecting, measuring or recording bioelectric or biomagnetic signals of the body or parts thereof A61B5/24
• CPC Class Codes: A61B 5/415 the glands, e.g. tonsils, adenoids or thymus
• CPC Class Codes: A61B 5/7217 of noise originating from a therapeutic or surgical apparatus, e.g. from a pacemaker

Abstract

Clinical applications for electrical tomography derived metrics are disclosed. One aspect of the present invention pertains to a method for generating clinical data by processing one or more metrics obtained via an electrical tomography. The method comprises receiving one or more metrics of an electrode stably associated with a tissue site of a subject, where the metrics are based on an induced signal of the electrode generated in response to one or more continuous electrical fields applied to the subject during an electrical tomography process. In addition, the method comprises generating clinical data of the internal organ of the subject based on the metrics.

Claims

1. A method for generating clinical data by processing at least one metric obtained via electrical tomography, the method comprising:

receiving at least one metric of a first electrode stably associated with a tissue site of a subject, wherein the at least one metric is based on an induced signal of the electrode generated in response to at least one continuous electrical field applied to the subject during an electrical tomography process; and

generating clinical data based on the at least one metric.

2. The method of claim 1, wherein the at least one continuous electrical field comprises three orthogonal electrical fields along an X-axis, a Y-axis, and a Z-axis.

3. The method of claim 2, wherein the at least one metric is based on displacement data along the X-axis, the Y-axis, and the Z-axis which correspond to the induced signal of the electrode, and the at least one metric is further based on temporal data associated with the displacement data.

4. The method of claim 3, wherein the generating the clinical data comprises determining a principal direction which is a maximal distance between any two points of the displacement data along the X-axis, the Y-axis, and the Z-axis.

5. The method of claim 4, wherein the tissue site is a cardiac tissue site.

6. The method of claim 5, wherein the generating the clinical data further comprises generating data representative of a principal velocity graph associated with the principal direction based on the displacement data and the temporal data, with the principal velocity graph comprising a systolic velocity wave, an early diastolic velocity wave, and an atrial contraction velocity wave.

7. The method of claim 6, further comprising analyzing a peak amplitude and a time to peak of the systolic velocity wave to determine a systolic performance or a contractile ability of a myocardium of the heart.

8. The method of claim 6, further comprising measuring a width between zero crossings of a peak or a full-width half maximum of the systolic velocity wave to determine a breadth of the peak of the systolic velocity wave.

9. The method of claim 6, further comprising analyzing a peak amplitude and a time to peak of the early diastolic velocity wave to determine at least one of a passive filling, a diastolic performance and a dysfunction of a left ventricle.

10. The method of claim 6, further comprising analyzing a peak amplitude and a time to peak of the atrial contraction velocity wave to determine an atrial contractile performance or a coordinated atrial/ventricular contraction.

11. The method of claim 6, further comprising analyzing a full-width half maximum of the systolic velocity wave to determine a passive filling, a diastolic performance, or a dysfunction of a left ventricle of the heart.

12. The method of claim 6, further comprising comparing the systolic velocity wave associated with the electrode and a second systolic velocity wave of a second electrode used for the electrical tomography to determine a cardiac dysynchrony or a coordinated contractile performance of the heart.

13. A system for generating clinical data by processing at least one metric obtained via electrical tomography, the system comprising:

an electrical field generator module for generating at least one continuous electrical field and applying the electrical field to a subject during an electrical tomography process, wherein a first electrode is stably associated with a tissue site of the subject;

a signal processing module for generating and forwarding the at least one metric associated with the electrode based on an induced signal of the electrode in response to the at least one continuous electrical field; and

a data analysis module for generating clinical data based on the at least one metric.

14. The system of claim 13, further comprising a device communicatively coupled to the electrode, wherein the device is operable for reconfiguration based on the clinical data.

15. The system of claim 13, wherein the signal processing module comprises a demodulator for demodulating the induced signal, and wherein the induced signal comprises an amplitude modulated sine wave.

16. The system of claim 13, wherein the at least one metric is based on displacement data of the first electrode.

17. The system of claim 16, wherein the displacement data are obtained by converting the induced signal to a physical unit of distance using a conversion factor.

18. The system of claim 17, wherein the first electrode is one of a plurality of electrodes implemented on an electrical lead, and wherein the conversion factor is obtained using an inter-electrode spacing of the plurality of electrodes.

19. The system of claim 18, wherein the signal processing module comprises a multiplexer configured for performing at least one of time multiplexing and frequency multiplexing respective induced signals forwarded from the plurality of electrodes.

20. A computer readable medium having instructions that when executed by a processor of an electrical tomography system causes the electrical tomography system to perform a method of generating clinical data by processing at least one metric obtained via electrical tomography, the method comprising:

receiving at least one metric of a first electrode stably associated with a tissue site of a subject, wherein the at least one metric is based on induced signal of the electrode generated in response to at least one continuous electrical field applied to the subject during an electrical tomography process; and

generating clinical data of based on the at least one metric.