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   The image immediately below shows the position of the image intensifier (II) and camera in the right anterior oblique or RAO projection. Since the interventricular groove lies in the plane between the right shoulder and left nipple, the II and camera view the outline of the septum.
    The video clip in the middle left panel was obtained in the cardiac cath lab as the left coronary angiogram was recorded in the RAO projection. The movie clip demonstrate both a "video" representation (coronary angios, as they appear on playback in the cath lab) and the "cine" or cineangiographic equivalent as seen on the developed film. The two views correspond to the negative and positive prints of photography film. You can toggle back and forth between the two views by clicking on the respective button. You can also click a button to see a lebeled freeze frame of the coronary angiogram.
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Legend: LM=Left main; LAD=Left anterior descending: Dx=Diagonal; SP=septal perforator; Ramus=ramus intermedius; Cx=Circumflex; OM=Obtuse marginalLPLA=Left posterolateral branch; LPDA=Left posterior descending artery; AV=AV nodal branch
  For purposes of reinforcement let us review the LAD course and branches again. 
  In the RAO view, the LAD begins close to the spine and then moves away from it and towards the LV apex. It gives off two sets of branches (one or more diagonals and several septal perforators).
  The diagonal (Dx) moves diagonally and away from the LAD. The septal perforators (SP) are smaller branches that come off the inferior border of the LAD (at roughly 90 degrees) and travel downward.

  The Cx, in this view,  moves parallel to the spine and give off the obtuse marginal (OM) and left posterolateral (LPLA) branches that come off at an angle and run roughly parallel to the LAD.
  The photograph on the left (above) shows the II and camera assembly in the RAO position. The picture to the right (above) shows the camera's view of the patient's heart.
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