X-ray exposure synchronization method and apparatus
First Claim
1. An X-ray exposure method for making time-sequential X-ray images of a periodically moving object which occasionally tends to move stochastically causing an artifact in at least one of said images comprising:
- determining the movement period of the object;
generating pulses manifesting a predetermined position of said object at the instances of the boundaries of said period;
irradiating the object with an X-ray beam in response to said pulses; and
predicting the time of occurrence of a pulse at the instant of a forthcoming boundary of said period, the predicting including recursive filtering with a Kalman filtering method.
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Accused Products
Abstract
A periodically moving object, e.g., the heart, is X-rayed in response to periodic pulses generated at instances in the period at which the object is anticipated to be in a given position. Stochastic movements shift the position of the object at those instances such that image artifacts may result. A prediction methodology is utilized to predict when the object has moved stochastically and therefore will be out of position at the forthcoming pulse. That forthcoming pulse is then suppressed to preclude imaging the object out of position. Kalman filtering is utilized in the prediction methodology.
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Citations
5 Claims
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1. An X-ray exposure method for making time-sequential X-ray images of a periodically moving object which occasionally tends to move stochastically causing an artifact in at least one of said images comprising:
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determining the movement period of the object; generating pulses manifesting a predetermined position of said object at the instances of the boundaries of said period; irradiating the object with an X-ray beam in response to said pulses; and predicting the time of occurrence of a pulse at the instant of a forthcoming boundary of said period, the predicting including recursive filtering with a Kalman filtering method. - View Dependent Claims (2, 3)
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4. An X-ray exposure apparatus for making time-sequential X-ray images of a periodically moving object which occasionally tends to move stochastically causing an artifact in at least one of said images comprising:
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means for determining the movement period of the object; means responsive to said means for determining for generating pulses manifesting a predetermined position of said object at the instances of the boundaries of said period; means for irradiating the object with an X-ray beam in response to said pulses; and means for predicting the time of occurrence of a pulse at the instant of a forthcoming boundary of said period, said latter means including means for recursive filtering with a Kalman filtering method. - View Dependent Claims (5)
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Specification