Horizontal artifact displayed on first two frames in any acquisition mode

Horizontal artifact displayed on first two frames in any acquisition mode Horizontal artifact displayed on first two frames in any acquisition mode. See long description for further details Horizontal artifact displayed on first two frames in any acquisition mode Problem has been observed on frontal plane of a biplane system. In any acquisition mode (i.e fluoro, cardiac record, DSA record), an horizontal artifact is displayed on the first two frames (see pictures below) then other frames are correctly displayed. First frame artifact Second frame artifact Artifact is visible during live (real time) acquisition and during sequence review (record sequence or Fluoro store sequence). Problem reproduceable at each acquisition, whatever acquisition plane selection (frontal or biplane). Note: as the problem is not related to a biplane acquisition mode, we can assume that this artifact can potentially occur on a monoplane system or on the lateral plane of a biplane system.