RAO
Also written as: RAO — Right Anterior Oblique
Angiographic projection angle positioning the image intensifier to the patient's right side and anteriorly.
Full Definition
Right Anterior Oblique describes an angiographic projection where the image intensifier is positioned to the patient's right side and moved anteriorly, commonly at 30 to 45-degree angles. RAO projections are essential for comprehensive coronary angiography, providing optimal views of the left anterior descending artery, right coronary artery, and posterior circulation. This projection is frequently combined with cranial or caudal angulation to separate overlapping vessels and demonstrate complex coronary anatomy. RAO views are particularly valuable for assessing ostial lesions and proximal vessel segments.
Usage
Usage note: Specify degree measurements and any cranial/caudal angulation used.
In Context
- "RAO 30° caudal projection revealed a significant stenosis in the proximal RCA." — Angiography report
- "The RAO view demonstrated clear separation of the LAD and diagonal branches." — Procedural note