Method and system for identifying optimal image within a series of images that depict a moving organ
First Claim
1. A method for obtaining a cyclic motion within a series of images depicting a moving object subject to composite motion containing a cyclic motion component having a cyclic period and a non-cyclic consistent component of a lower frequency than the cyclic motion component, the method comprising:
- a computer performing the steps of;
(a) computing the composite motion between at least one pair of successive images, the composite motion represented by at least one vector;
(b) computing the non-cyclic consistent component as an integral of the composite motion over the cyclic period;
(c) computing a proportional part of the non cyclic consistent component for each of the at least one pair of successive images; and
(d) for each of the at least one pair of successive images, subtracting the proportional part of the non-cyclic consistent component from the composite motion so as to obtain the cyclic motion component,wherein the series of images comprises an at least one series of N images acquired during a cyclic period, each frame having an index i within the cyclic period, i=1 . . . N, and wherein the proportional part of the non cyclic component for each of the at least one pair of successive images i-1 and i is determined by dividing the non cyclic component by N and multiplying by i-1.
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Accused Products
Abstract
A method and system for quantifying a cyclic motion within a series of images depicting a moving object subject to composite motion containing a cyclic component and a non-cyclic component of lower frequency than the cyclic component. Composite motion is computed as well as the non-cyclic component as the integral of motion over a motion cycle. The non-cyclic component is subtracted from the composite motion so as to obtain the cyclic component
190 Citations
28 Claims
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1. A method for obtaining a cyclic motion within a series of images depicting a moving object subject to composite motion containing a cyclic motion component having a cyclic period and a non-cyclic consistent component of a lower frequency than the cyclic motion component, the method comprising:
- a computer performing the steps of;
(a) computing the composite motion between at least one pair of successive images, the composite motion represented by at least one vector; (b) computing the non-cyclic consistent component as an integral of the composite motion over the cyclic period; (c) computing a proportional part of the non cyclic consistent component for each of the at least one pair of successive images; and (d) for each of the at least one pair of successive images, subtracting the proportional part of the non-cyclic consistent component from the composite motion so as to obtain the cyclic motion component, wherein the series of images comprises an at least one series of N images acquired during a cyclic period, each frame having an index i within the cyclic period, i=1 . . . N, and wherein the proportional part of the non cyclic component for each of the at least one pair of successive images i-1 and i is determined by dividing the non cyclic component by N and multiplying by i-1. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22)
- a computer performing the steps of;
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23. A system for obtaining a cyclic motion within a series of images depicting a moving object subject to composite motion containing a cyclic motion component having a cyclic period and a non-cyclic consistent component of a lower frequency than the cyclic motion component, the system comprising:
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a composite motion unit for computing the composite motion between at least one pair of successive images, the composite motion represented by at least one vector; a non-cyclic motion unit for computing the non-cyclic consistent component as an integral of the composite motion over the cyclic period; a proportional part unit for computing a proportional part of the non cyclic motion component for each of the at least one pair of successive images; and a subtraction unit for subtracting the proportional part of the non-cyclic consistent component from the composite motion occurring between each of the at least one pair of successive images, so as to obtain the cyclic motion component, wherein the series of images comprises an at least one series of N images acquired during a cyclic period, each frame having an index i within the cyclic period, i=1 . . . N, and wherein the proportional part of the non cyclic component for each of the at least one pair of successive images i-1 and i is determined by dividing the non cyclic component by N and multiplying by i-1 , wherein at least one of the above units is implemented in a hardware or hardware software combination. - View Dependent Claims (24, 25, 26, 27, 28)
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Specification