The features of heart x-ray diagnostics in newborns are considered. The necessity of synchronization of x-ray apparatus with electrocardiogram (ECG) is substantiated. Prospective and retrospective methods of ECG synchronization are described, the limits of their applicability are determined. The block diagram of the device for ECG registration in one lead is given, the functional purpose of each block of the scheme is considered. An example of an ECG recorded using the developed device is shown. Based on the recorded ECG, a method for recognizing the diastolic phase is shown. The original ECG signal is processed by the moving average filter, then its first derivative is calculated. The resulting signal also passes through the «moving average» filter, and then differentiates, becoming the second derivative of the original ECG signal. For the first and second derivatives are set thresholds, within which the first and second derivatives must be located to enable the x-ray apparatus. Averaging the diastolic phase of 20–30 cardiocycles allows you to calculate the time window in which the x-ray machine is switched on. The application of the developed method can significantly improve the quality of x-ray images by improving the accuracy of control of the x-ray apparatus by synchronizing its operation with the diastolic phase of the ECG.
Removal of ECG Baseline Wander using Savitzky-Golay Filter Based Method