Method for determining the time point of a heart movement and corresponding apparatus
A method for determining a time point of a heart movement is described, wherein an EKG signal showing the heart movement is received. A first time point is determined, after which a mechanical signal characterizing the heart movement will probably be received, as a function of the received EKG signal. A mechanical signal is also received after the determined first time point. The time point of a heart movement can be concluded based on the receive time point of the mechanical signal. An apparatus for determining a time point of a heart movement is also described. The apparatus has a first receive facility, a timing facility, a second receive facility, and an evaluation facility. The evaluation facility is configured to determine the receive time point of the mechanical signal and to determine a time point of a heart movement based on the determined receive time point of the mechanical signal.
1. A method for determining a time point of a heart movement, the method comprising:
receiving an EKG signal showing the heart movement;
determining a first time point, after which a mechanical signal showing the heart movement is estimated to be received, as a function of the received EKG signal;
receiving the mechanical signal after the first time point from a non-invasive sensor;
determining a receive time point of the mechanical signal;
determining the time point of the heart movement based on at least one of the determined receive time point of the mechanical signal and the first time point; and
triggering an imaging system as a function of the determined time point of the heart movement.
2. The method of claim 1 , further comprising:
determining a second time point as a function of the received EKG signal, a time interval being between the first time point and the second time point, the time interval representing an interval in which the mechanical signal showing the heart movement is estimated to be received.
3. The method of claim 2 , wherein if no mechanical signal has been received in the time interval, the determined time point of the heart movement is set at a defined time point after a time point of an electrical excitation of the heart, the time point of the electrical excitation of the heart being indicated in the EKG signal.
4. The method of claim 1 , wherein the receiving the mechanical signal includes deriving and filtering the mechanical signal.
5. The method of claim 1 , wherein the determining the receive time point determines the receive time point as a time point in which an amplitude of the mechanical signal exceeds a threshold value.
6. The method of claim 1 , wherein the non-invasive sensor is a pressure sensor.
7. The method of claim 1 , wherein the receiving the EKG signal receives the EKG signal using a capacitive sensor.
8. The method of claim 5 , wherein the threshold value is based on a function of an expected maximum amplitude of an M-signal.
9. An apparatus for determining a time point of a heart movement, comprising:
a first receive facility, to receive an EKG signal characterizing the heart movement;
a timing facility, to determine a first time point, after which a mechanical signal showing the heart movement is estimated to be received, as a function of the received EKG signal;
a second receive facility, to receive the mechanical signal after the first time point from a non-invasive sensor; and
an evaluation facility, to determine a receive time point of the mechanical signal and to determine the time point of the heart movement based on at least one of the determined receive time point of the mechanical signal and the first time point and to trigger an imaging system as a function of the determined time point of the heart movement.
10. The apparatus of claim 9 , wherein the timing facility is configured to determine
a second time point as a function of the received EKG signal, a time interval being between the first time point and the second time point, the time interval representing an interval in which the mechanical signal showing the heart movement is estimated to be received.
11. The apparatus of claim 9 , wherein the evaluation facility is configured to derive and filter the received mechanical signal.
12. The apparatus of claim 9 , wherein the evaluation facility is configured to determine the receive time point as a time point at which an amplitude of the mechanical signal exceeds a threshold value.
13. A non-transitory computer-readable medium storing instructions, when executed by a processor, configured to cause the processor to execute the method of claim 1 .
14. The method of claim 2 , wherein the receiving the mechanical signal includes deriving and filtering the mechanical signal.
15. The method of claim 3 , wherein the receiving the mechanical signal includes deriving and filtering the mechanical signal.
16. The apparatus of claim 10 , wherein the evaluation facility is configured to derive and filter the received mechanical signal.
17. The apparatus of claim 10 , wherein the evaluation facility is configured to determine the receive time point as a time point at which an amplitude of the mechanical signal exceeds a threshold value.