Ischemia identification, quantification and partial localization MCG
First Claim
1. A system for identifying and localizing ischemic cardiac tissue comprising:
- a system measuring magnetic cardiac cycle data and modeling an effective dipole as a source of said measured magnetic data at a proximate point on an ST segment of said measured magnetic data;
an ischemia localizer calculating and visualizing spatial positions associated with said modeled dipole over a remainder of said ST segment, and an ischemia identifier identifying significant movement and a direction associated with said movement of said dipole over said ST segment, and in case of a moving dipole;
said heart identified as having ischemic tissue, and said direction of movement identified as pointing to a general location of said ischemic cardiac tissue.
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Accused Products
Abstract
A magnetic dipole model based on MCG data of the heart is used to localize cardiac tissue afflicted with ischemia. The direction of displacement of the dipole during the ST segment, superimposed on the heart'"'"'s general outline, indicates a rough location of the ischemic cardiac tissue. Furthermore, the extent of ischemia is quantified based upon the how much displacement occurs in the ST segment. For example, if significant dipole'"'"'s displacement occurs in the first quarter of the ST segment, then it is identified as a first-degree ischemia. Similarly, if displacement occurs in ½, ¾, or 1 full ST segment, then the level of ischemia is identified as second degree, third degree, or fourth degree ischemia (fourth degree being the worst kind of ischemia where the dipole'"'"'s position is dynamic all through the ST segment).
55 Citations
21 Claims
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1. A system for identifying and localizing ischemic cardiac tissue comprising:
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a system measuring magnetic cardiac cycle data and modeling an effective dipole as a source of said measured magnetic data at a proximate point on an ST segment of said measured magnetic data;
an ischemia localizer calculating and visualizing spatial positions associated with said modeled dipole over a remainder of said ST segment, and an ischemia identifier identifying significant movement and a direction associated with said movement of said dipole over said ST segment, and in case of a moving dipole;
said heart identified as having ischemic tissue, and said direction of movement identified as pointing to a general location of said ischemic cardiac tissue. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A method for ischemic cardiac tissue identification and localization based upon a magnetic or current dipole model of the heart, said method comprising the steps of:
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(a) magnetically measuring a cardiac cycle of a heart and modeling said heart as an effective dipole;
(b) identifying an ST segment in said measured cardiac cycle;
(c) identifying a spatial location of said dipole at the beginning of said ST segment;
(d) detecting any significant displacement in the location of said dipole during the remainder of said ST segment;
(e) identifying said significant displacement of said effective dipole with the presence of ischemic tissue in the heart, and (f) referencing the direction of said significant displacement of said effective dipole with respect to heart'"'"'s general location and anatomy, and (g) localizing the general location of said ischemic cardiac tissue as being pointed to by said identified direction of displacement of said effective dipole. - View Dependent Claims (8, 9, 10, 11, 12)
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13. A method for identifying, localizing and quantifying ischemia, said method comprising the steps of:
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(a) receiving cardiac cycle magnetic data and modeling said heart as a dipole;
(b) identifying an ST segment in said measured cardiac cycle;
(c) identifying said dipole'"'"'s position at the beginning of said identified ST segment;
(d) determining whether said dipole significantly moves during any part of the ST segment;
(e) identifying the direction of said movement of said dipole'"'"'s position in reference to the general position and anatomy of the heart;
(f) localizing ischemic cardiac tissue based upon said identified direction of displacement;
(g) dividing the total time duration of said ST segment into four equal duration sub-segments;
(h) identifying significant displacement of said dipole in each of said four subsegments, and (i) assigning a quantified level of ischemia based on the following rules;
if said identified significant displacement occurs in a first of said four segments, then identify said quantified level as first degree ischemia, else if said identified significant displacement occurs in a first two of said sub-segments, then identify said quantified level as second degree ischemia, else if said identified significant displacement occurs in a first three of said sub-segments, then identify said quantified level as third degree ischemia, else if said identified significant displacement occurs in all four of said sub-segments, then identify said quantified level as fourth degree ischemia. - View Dependent Claims (14, 15)
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16. An article of manufacture comprising a computer usable medium having computer readable program code embodied therein for localizing ischemic cardiac tissue, said medium further comprising:
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(a) computer readable program code receiving magnetic cardiac cycle data of a heart and modeling said heart as a dipole;
(b) computer readable program code identifying an ST segment in said measured cardiac cycle;
(c) computer readable program code identifying said dipole'"'"'s position at the beginning of said ST segment;
(d) computer readable program code detecting any significant displacement in the location of said dipole during the rest of said ST segment;
(e) computer readable program code identifying the direction of said displacement of said dipole with respect to heart'"'"'s general outline and anatomy, and (f) computer readable program code localizing ischemic cardiac tissue based upon said identified direction of displacement. - View Dependent Claims (17)
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18. A tool for detecting and localizing ischemic cardiac tissue and quantifying level of ischemia in afflicted cardiac tissue, said tool comprising:
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measuring magnetic cardiac cycle data of a heart and modeling said data based upon a magnetic dipole model of said heart;
isolating an ST segment in said cardiac cycle data;
identifying said dipole'"'"'s position at a proximate point on said isolated ST segment;
said tool further functioning in any of, or a combination of, the following modes;
a detection and localizing mode or quantifying mode, andin a localizing mode, said tool;
detecting dipole'"'"'s displacement during a remainder of said ST segment;
identifying direction of said displacement, and localizing ischemic cardiac tissue as heart'"'"'s region in said identified direction of displacement, or in a quantifying mode, said tool;
identifying dipole'"'"'s displacement during said ST segment;
dividing said ST segment into two or more sub-segments;
identifying number of said sub-segments where said dipole'"'"'s displacement occurs, and quantifying level of ischemia by matching said identified number of said sub-segments where said displacement occurs with predetermined quantification levels. - View Dependent Claims (19, 20, 21)
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Specification