METHOD OF DETECTION AND COMPENSATION FOR RESPIRATORY MOTION IN RADIOGRAPHY CARDIAC IMAGES SYNCHRONIZED WITH AN ELECTROCARDIOGRAM SIGNAL
First Claim
1. A method for detecting and compensating for respiratory motion, the method comprising:
- producing a 3D image of a patient'"'"'s heart by means of a 3D imaging system;
recording an electrocardiogram at the same time as the 3D image is acquired;
performing a segmentation of the 3D image;
exposing the patient'"'"'s heart to radiation produced by a radiography imaging system;
obtaining, through a detector, a succession of radiography images representing an internal structure of the heart;
synchronizing the succession of acquired radiography images with the electrocardiogram;
computing an initial registration between one of the radiography images and a re-projection of the 3D image;
analyzing at least one part of the radiography images in order to highlight a respiratory motion therein;
determining an additional respiratory registration linked to the respiration,making a fusion of the re-projected 3D image with radiography images in compensating for the respiratory motion of the radiography images with the additional registration; and
displaying the fusion image on a viewing screen.
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Abstract
A method of detection and compensation for respiratory motion improves the registration between a 3D pre-operation image and X-ray images acquired during a cardiac intervention. By synchronizing the X-ray images with the electrocardiogram, the disclosed method thus eliminates the motion related to the heart cycle from these images, thus isolating the contribution of the respiratory motion. From this point, an algorithm is proposed capable of attributing the motion remaining in the radiography images to respiration. The algorithm also enables this motion to be detected and compensated for in order to obtain a registration between 3D cardiac images and radiography images.
40 Citations
12 Claims
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1. A method for detecting and compensating for respiratory motion, the method comprising:
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producing a 3D image of a patient'"'"'s heart by means of a 3D imaging system; recording an electrocardiogram at the same time as the 3D image is acquired; performing a segmentation of the 3D image; exposing the patient'"'"'s heart to radiation produced by a radiography imaging system; obtaining, through a detector, a succession of radiography images representing an internal structure of the heart; synchronizing the succession of acquired radiography images with the electrocardiogram; computing an initial registration between one of the radiography images and a re-projection of the 3D image; analyzing at least one part of the radiography images in order to highlight a respiratory motion therein; determining an additional respiratory registration linked to the respiration, making a fusion of the re-projected 3D image with radiography images in compensating for the respiratory motion of the radiography images with the additional registration; and displaying the fusion image on a viewing screen. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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Specification