ECG waveform detecting apparatus and imaging apparatus

1. An ECG waveform detecting apparatus comprising:

an input circuit configured to receive an ECG signal; and

processing circuitry configured to

(a) perform first detection of a specific waveform included in the ECG signal,

(b) perform update processing of a detection parameter for detecting the specific waveform, based on a part of the specific waveform or result of the first detection,

(c) perform second detection of the specific waveform from the ECG signal by using the detection parameter after the update processing, and

(d) generate a synchronization signal based on information on the second detection,

wherein the processing circuitry is configured to perform the first detection based on the ECG signal included in a first detection period and perform the second detection based on the ECG signal included in a second detection period which is a period shorter than the first detection period.

2. The apparatus according to claim 1 ,

wherein the specific waveform is an R-wave;

the first detection period is composed of a span of the R-wave, a span which starts earlier than the R-wave by a predetermined time and ends immediately before the R-wave, and a span which starts immediately after the R-wave and lasts for a predetermined time; and

the second detection period is a period which starts earlier than a peak of the R-wave by a predetermined time and lasts to the peak.

3. An imaging apparatus comprising the ECG waveform detecting apparatus according to claim 2 .

4. The apparatus according to claim 1 ,

wherein the processing circuitry is configured to

(a) generate a high-frequency enhanced ECG signal by enhancing a high-frequency band of the ECG signal,

(b) perform the second detection by holding a waveform corresponding to the high-frequency enhanced ECG signal as a high-frequency enhanced template and then matching the high-frequency enhanced template with a waveform of the high-frequency enhanced ECG signal, and

(c) perform the update processing by extracting the high-frequency enhanced ECG signal corresponding to the specific waveform and then updating the high-frequency enhanced template as the detection parameter, based on result of the first detection.

5. An imaging apparatus comprising the ECG waveform detecting apparatus according to claim 4 .

6. The apparatus according to claim 1 ,

wherein the processing circuitry is configured to perform the first detection and the second detection so that at least one of the first detection and the second detection includes processing of (a) calculating a first integrated value of the ECG signal during a first period, (b) calculating a second integrated value of the ECG signal during a second period, and (c) detecting the specific waveform by using the first integrated value and the second integrated value.

7. An imaging apparatus comprising the ECG waveform detecting apparatus according to claim 6 .

8. The ECG waveform detecting apparatus according to claim 1 ,

wherein the detection parameter is a shape of a template; and

the processing circuitry is configured to perform the update processing by updating the shape of the template by using the specific waveform detected in the first detection.

9. An imaging apparatus comprising the ECG waveform detecting apparatus according to claim 8 .

10. The ECG waveform detecting apparatus according to claim 1 ,

wherein the processing circuitry is configured to perform the update processing by receiving information on operation state of an ECG synchronization imaging apparatus which is an output destination of, the synchronization signal and determining whether the detection parameter can be updated or not based on the information on operation state.

11. An imaging apparatus comprising the ECG waveform detecting apparatus according to claim 10 .

12. An imaging apparatus comprising the ECG waveform detecting apparatus according to claim 1 .

13. An ECG waveform detecting method comprising:

performing first detection of a specific waveform included in an ECG signal,

performing update processing of a detection parameter for detecting the specific waveform, based on a part of the specific waveform or result of the first detection,

performing second detection of the specific waveform from the ECG signal by using the detection parameter after the update processing, and

generating synchronization signal based on information on the second detection,

wherein the first detection is performed based on the ECG signal included in a first detection period and the second detection is performed based on the ECG signal included in a second detection period which is a period shorter than the first detection period.

14. The method according to claim 13 ,

wherein the specific waveform is an R-wave;

the first detection period is composed of a span of the R-wave, a span which starts earlier than the R-wave by a predetermined time and ends immediately before the R-wave, and a span which starts immediately after the R-wave and lasts for a predetermined time; and

the second detection period is a period which starts earlier than a peak of the R-wave by a predetermined time and lasts to the peak.

15. The method according to claim 13 , further comprising:

generating a high-frequency enhanced ECG signal by enhancing a high-frequency band of the ECG signal,

performing the second detection by holding a waveform corresponding to the high-frequency enhanced ECG signal as a high-frequency enhanced template and then matching the high-frequency enhanced template with a waveform of the high-frequency enhanced ECG signal, and

performing the update processing by extracting the high-frequency enhanced ECG signal corresponding to the specific waveform and then updating the high-frequency enhanced template as the detection parameter, based on result of the first detection.

16. The method according to claim 13 ,

wherein the processing circuitry is configured to perform the first detection and the second detection so that at least one of the first detection and the second detection includes processing of (a) calculating a first integrated value of the ECG signal during a first period, (b) calculating a second integrated value of the ECG signal during a second period, and (c) detecting the specific waveform by using the first integrated value and the second integrated value.

17. The method according to claim 13 ,

wherein the detection parameter is a shape of a template; and

the shape of the template is updated by using the specific waveform detected in the first detection.

18. The method according to claim 13 , further comprising:

receiving information on operation state of an ECG synchronization imaging apparatus which is an output destination of the synchronization signal; and

determining whether the detection parameter can be updated or not based on the information on the operation state.