A method for performing OCT imaging while avoiding systole, and devices for performing the same are disclosed. A trigger device for controlling OCT imaging of an OCT device, according to one embodiment, comprises: an electrode for sensing an electrocardiogram signal from a sample; and a controller for controlling the OCT device such that the OCT device performs the OCT imaging while avoiding the systole of a myocardium of the sample on the basis of an electrocardiogram period of the electrocardiogram signal.