Method and system for image improvement with ECG gating and dose reduction in CT imaging
First Claim
1. A method for calculating duration of a representative cardiac cycle using ECG waveform data, the method comprising:
- generating the ECG waveform data using an electrocardiogram device;
evaluating said ECG data to validate a signal from said electrocardiogram device;
detecting QRS complexes of ECG data using a detection function;
analyzing underlying cardiac rhythm based on said detected QRS complexes;
selecting an even number N of substantially normally shaped consecutive QRS complexes;
computing an RR interval between said consecutive QRS complexes to yield N−
1 intervals;
calculating duration of the representative cardiac cycle by averaging at least a plurality of said N−
1 intervals.
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Accused Products
Abstract
A method and system for associating ECG waveform data with medical imaging data using ECG gating for dose reduction and image improvement by generating the ECG waveform data using an electrocardiogram device. The ECG data is first validated and then QRS complexes are detected using a detection function. An underlying cardiac rhythm based on the detected QRS complexes is analyzed and an even number N of substantially normally shaped consecutive QRS complexes are selected. An RR interval between consecutive QRS complexes is computed to yield N−1 intervals. Duration of a representative cardiac cycle by averaging at least a plurality of the N−1 intervals is determined. Once a representative cardiac cycle is determined, a method to control power and improve image quality with the presence of patient'"'"'s having arrhythmias is disclosed.
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Citations
36 Claims
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1. A method for calculating duration of a representative cardiac cycle using ECG waveform data, the method comprising:
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generating the ECG waveform data using an electrocardiogram device;
evaluating said ECG data to validate a signal from said electrocardiogram device;
detecting QRS complexes of ECG data using a detection function;
analyzing underlying cardiac rhythm based on said detected QRS complexes;
selecting an even number N of substantially normally shaped consecutive QRS complexes;
computing an RR interval between said consecutive QRS complexes to yield N−
1 intervals;
calculating duration of the representative cardiac cycle by averaging at least a plurality of said N−
1 intervals. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A medium encoded with a machine-readable computer program code for associating ECG waveform data with medical imaging data using a data synchronization scheme, said medium including instructions for causing a controller to implement a method comprising:
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generating the ECG waveform data using an electrocardiogram device;
evaluating said ECG data to validate a signal from said electrocardiogram device;
detecting QRS complexes of ECG data using a detection function;
analyzing underlying cardiac rhythm based on said detected QRS complexes;
selecting an even number N of substantially normally shaped consecutive QRS complexes;
computing an RR interval between said consecutive QRS complexes to yield N−
1 intervals;
calculating duration of the representative cardiac cycle by averaging at least a plurality of said N−
1 intervals. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18)
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19. A method for associating ECG waveform data with image data generated by an imaging system using a data synchronization scheme comprising:
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obtaining the imaging system, an electrocardiogram device and an object to be examined;
associating said object with the imaging system and said electrocardiogram device; and
processing the image data and the ECG waveform data using the data synchronization scheme wherein the data synchronization scheme, generates the ECG waveform data using an electrocardiogram device;
evaluates said ECG data to validate a signal from said electrocardiogram device;
detects QRS complexes of ECG data using a detection function;
analyzes underlying cardiac rhythm based on said detected QRS complexes;
selects an even number N of substantially normally shaped consecutive QRS complexes;
computes an RR interval between said consecutive QRS complexes to yield N−
1 intervals; and
calculates duration of the representative cardiac cycle by averaging at least a plurality of said N−
1 intervals.
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20. A system for associating ECG waveform data with image data using a data synchronization scheme comprising:
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an imaging system;
an object disposed so as to be communicated with said imaging system, wherein said imaging system generates image data responsive to said object; and
a processing device having the data synchronization scheme, wherein the data synchronization scheme, generates the ECG waveform data using an electrocardiogram device;
evaluates said ECG data to validate a signal from said electrocardiogram device;
detects QRS complexes of ECG data using a detection function;
analyzes underlying cardiac rhythm based on said detected QRS complexes;
selects an even number N of substantially normally shaped consecutive QRS complexes;
computes an RR interval between said consecutive QRS complexes to yield N−
1 intervals; and
calculates duration of the representative cardiac cycle by averaging at least a plurality of said N−
1 intervals. - View Dependent Claims (21, 22)
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23. A method to improve cardiac image quality in the presence of arrhythmias during medical imaging with a scanning medical imaging system, the method comprising:
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calculating a representative R-R interval of a patient;
selecting a scanning window within said representative R-R interval;
scanning a patient'"'"'s heart during said scanning window to obtain image data;
detecting an arrhythmia at one of prior and during said scanning window; and
assembling an image of the patient'"'"'s heart representative of said scanning window of said R-R interval from chronologically discontinuous segments of the image data while rejecting any image data corresponding to any R-R interval of plurality of R-R intervals having said arrhythmia. - View Dependent Claims (24, 25, 26, 27, 28, 29, 30)
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31. A scanning computed tomography (CT) imaging system for imaging a heart, said system configured to:
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compute a representative R-R interval of a patient using an ECG signal;
scan said patient'"'"'s heart a plurality of times during a selected scanning window of said R-R interval to obtain image data;
detect an arrhythmia at one of prior and during said scanning window;
reject any image data corresponding to any R-R interval having said arrhythmia; and
assemble an image of said patient'"'"'s heart representative of said selected scanning window of the cardiac cycle from chronologically discontinuous segments of the image data. - View Dependent Claims (32, 33, 34, 35, 36)
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Specification