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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.