Method, apparatus and product for acquiring cardiac images

• US 7,454,248 B2
• Filed: 01/30/2004
• Issued: 11/18/2008
• Est. Priority Date: 01/30/2004
• Status: Active Grant

• Current Assignee: APN Health, LLC, GE Medical Systems Global Technology Company LLC (GE Healthcare Technologies, Inc.)
• Original Assignee: GE Medical Systems Global Technology Company LLC (GE Healthcare Technologies, Inc.), Jasbir S. Sra
• Inventors: Sra, Jasbir S., Burrell, Marc Anthony
• Primary Examiner(s): BOCKELMAN, MARK
• Application Number:
  US10/707,993
• Publication Number:
  US 20050187587A1
• Time in Patent Office: 1,754 Days
• Field of Search: 607/9, 600427-428, 600/509
• US Class Current: 607/9
• CPC Class Codes: A61B 6/541 involving acquisition triggered by a physiological signal
• CPC Class Codes: A61B 8/543 involving acquisition triggered by a physiological signal

Abstract

A method for acquiring cardiac information from a patient having a pacer for pacing a heart rhythm, an abnormal EKG, or an abnormal heartbeat is disclosed. The method includes: placing a signal injection device proximate the pacer of the patient and injecting a signal across a skin barrier of the patient toward the pacer; in response to the signal received at the pacer, pacing the patient'"'"'s heart in a fixed asynchronous pacing mode; and, acquiring cardiac information relating to the patient'"'"'s fixed asynchronously paced heart.

Claims

1. A method for acquiring a cardiac image from a patient having a pacer for pacing a heart rhythm, an abnormal EKG, or an abnormal heartbeat, the method comprising:

receiving a gated electrocardiogram signal having local maxima and minima values and trigger points;

determining for a period of time the time between each trigger point and the local maxima or minima associated therewith;

in response to the trigger point occurring at the associated local maxima or minima, calculating a zero time differential for a corrected trigger for gating;

in response to the trigger point occurring prior to the associated local maxima or minima, calculating a time delay for the corrected trigger;

in response to the trigger point occurring after the associated local maxima or minima, calculating a time advancement for the corrected trigger;

sending the corrected trigger to a cardiac image acquisition device for gating, wherein the gating is substantially synchronized with the local maxima or minima of the gated electrocardiogram signal;

placing a signal injection device proximate the pacer of the patient and injecting a signal across a skin barrier of the patient toward the pacer;

in response to the signal received at the pacer, pacing the patient'"'"'s heart in a fixed asynchronous pacing mode; and

acquiring a cardiac image of the patient'"'"'s fixed asynchronously paced heart.

2. The method of claim 1, wherein the signal injection device is a magnetic signal injection device comprising at least one of a fixed magnet and an electromagnet.

3. The method of claim 2, further comprising:

in response to the magnetic signal received at the pacer, activating a switch at the pacer for pacing the patient in a fixed asynchronous pacing mode.

4. The method of claim 2, wherein the magnetic signal injection device is adapted to produce a magnetic signal having a signal strength at the pacer equal to or greater than about 90 Gauss when placed at a distance equal to or less than about 2 inches from the pacer.

5. The method of claim 2, wherein the magnetic signal injection device has an outside dimension equal to or greater than an outside dimension of the pacer.

6. The method of claim 1, wherein the fixed asynchronous pacing mode includes a ventricular, an atrial, or a dual chamber asynchronous pacing mode.

7. A method for acquiring cardiac information from a patient having a pacer for pacing a heart rhythm, an abnormal EKG, or an abnormal heartbeat, the method performed using an apparatus having electrocardiogram-gated acquisition and cardiac imaging capabilities for use with a patient having a pacer, the apparatus comprising an electrocardiograph, a cardiac scanner in signal communication with the electrocardiograph, an interface board in signal communication intermediate the electrocardiograph and the cardiac scanner, and a storage medium, readable by a processing circuit, storing instructions for execution by the processing circuit for performing aspects of the method, the method comprising:

receiving a gated electrocardiogram signal having local maxima and minima values and trigger points;

determining for a period of time the time between each trigger point and the local maxima or minima associated therewith;

in response to the trigger point occurring at the associated local maxima or minima, calculating a zero time differential for a corrected trigger for gating;

in response to the trigger point occurring prior to the associated local maxima or minima, calculating a time delay for the corrected trigger;

in response to the trigger point occurring after the associated local maxima or minima, calculating a time advancement for the corrected trigger;

sending the corrected trigger to a cardiac image acquisition device for gating, wherein the gating is substantially synchronized with the local maxima or minima of the gated electrocardiogram signal;

placing a signal injection device proximate the pacer of the patient and injecting a signal across a skin barrier of the patient toward the pacer;

in response to the signal received at the pacer, pacing the patient'"'"'s heart in a fixed asynchronous pacing mode; and

acquiring cardiac information relating to the patient'"'"'s fixed asynchronously paced heart; and

acquiring a cardiac image of the patient'"'"'s fixed asynchronously paced heart.