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   A shallow RAO (10 to 20 degrees) with a 15 to 30 degrees cranial angulation is an excellent view that:
  • lays out the left main coronary artery
  • lays out the proximal left anterior descending
  • projects the origin and trunks of the ramus intermediate and first diagonal   downwards to avoid overlap by the proximal circumflex

   In the Right Anterior Oblique or RAO-Cranial view, the camera is rotated along a vertical axis towards the patient's right and also along the vertical axis towards the head or cranium, as shown in the bottom-left picture. The camera and image intensifier are represented by the arrowhead (cone) while the source of the x-ray beam is demonstrated by the tail of the arrow (cylinder). The shaft of the arrow is the x-ray beam as it travels through the heart and across the right and left coronary arteries. Please note that the ventricular septum lies in a plane between the right shoulder and the left nipple. Thus, in the RAO view, the camera "looks" at the outline of the septum, but from a point of view that is higher than the straight RAO view. than the straight RAO view.

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