Methods and software for self-gating a set of images
First Claim
1. A method of self-gating a set of images, the method comprising:
- acquiring a set of overlapping slice images of a patient'"'"'s heart;
generating a projection with the set of slice images;
marking a region of the projection;
analyzing the marked region to calculate a heart frequency and phase of the patient'"'"'s heart motion;
selecting groups of slice images from the set of slice images, based on their relative position in the calculated heart motion frequency and phase; and
generating a plurality of groups of slices that correspond to different phases of heart motion.
12 Assignments
0 Petitions
Accused Products
Abstract
Methods and software for self-gating a set of images. In exemplary embodiments, a fundamental heart frequency of the patient can be measured without the use of an ECG signal. In one method, the fundamental heart frequency can be determined by analyzing the size of the heart in the images. In another method, the fundamental heart frequency can be determined by applying a Fourier Transform. The measured fundamental heart frequency can thereafter be used to select slice images from the image scan for creation of a sagittal or coronal projection image. In exemplary embodiments, the resultant projection image can be used for coronary calcium detection and scoring.
-
Citations
20 Claims
-
1. A method of self-gating a set of images, the method comprising:
-
acquiring a set of overlapping slice images of a patient'"'"'s heart;
generating a projection with the set of slice images;
marking a region of the projection;
analyzing the marked region to calculate a heart frequency and phase of the patient'"'"'s heart motion;
selecting groups of slice images from the set of slice images, based on their relative position in the calculated heart motion frequency and phase; and
generating a plurality of groups of slices that correspond to different phases of heart motion. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
-
-
19. A method of Fourier gating an image dataset, the method comprising:
-
obtaining a plurality of overlapping slice images of a patient'"'"'s heart;
calculating an intensity signal for the overlapping slice images;
Fourier transforming the intensity signal to find a fundamental frequency of the patient'"'"'s heart cycle;
analyzing the intensity signal with a derivative filter to locate slice images that were obtained during diastole of the patient'"'"'s heart cycle; and
selecting slices that correspond to the patient'"'"'s diastole. - View Dependent Claims (18)
-
-
20. A method of Fourier gating an image dataset, the method comprising:
-
obtaining a plurality of overlapping slice images of a patient'"'"'s heart;
generating at least one of a coronal and sagittal projection with the set of slice images;
marking a region of the projection;
calculating an intensity signal along a direction of the slice images for the projection in the marked region;
Fourier transforming the intensity signal to find a fundamental frequency of a patient'"'"'s heart cycle;
analyzing the intensity signal with a derivative filter to locate slice images that were obtained during a diastole of the patient'"'"'s heart cycle;
using the intensity signal analysis to establish the phase of the fundamental frequency obtained from the Fourier transformation of the heart motion;
extending the selection process outside the marked region by obtaining the frequency of the heart motion from the Fourier transformation and the phase from the intensity signal; and
selecting slices that correspond to the patient'"'"'s diastole.
-
Specification