Questions and Answers
Which side is generally the side of interest?
The one farthest from the IR
Which side of the chest is of primary interest with the PA oblique projection, RAO position?
Left
With reference to the patient, where should the upper border of the IR be placed?
1.5-2 in above the vertebral prominens
How many degrees should the patient be rotated in the PA oblique position, RAO position?
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What determines how many degrees the patient should be rotated for the PA oblique projection, LAO position?
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When performing the PA oblique projection, LAO position, how many degrees should the patient be rotated to demonstrate lungs?
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When performing the PA oblique projection, LAO position, how many degrees should the patient be rotated to demonstrate the heart and great vessels?
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What is the proper respiration technique during the PA oblique projection?
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To what level of the patient should the central ray be directed?
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Which PA oblique projection provides the best view of the left atrium and the entire left branch of the bronchial tree?
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When viewing PA oblique chest images, where should the patient's left side be directed?
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In PA oblique chest images (LAO position), how should the left lung appear?
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The heart and mediastinal structures should be clearly demonstrated within the lung field of the elevated side in oblique images of 45 degrees of body rotation.
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Study Notes
PA Oblique Projections: RAO and LAO Positions
- The side of interest in PA oblique projections is the one farthest from the image receptor (IR).
- In the right anterior oblique (RAO) position, the left side of the chest is of primary interest.
- The upper border of the IR should be positioned 1.5-2 inches above the vertebral prominens.
- A patient should be rotated 45 degrees for the RAO position during a PA oblique projection.
- The degree of rotation for the PA oblique projection, LAO position, depends on the desired structures being visualized.
- For lung demonstration in the LAO position, the patient should be rotated 45 degrees.
- For optimal visualization of the heart and great vessels in the LAO position, the patient should be rotated 55-60 degrees.
- Imaging should be performed after the patient takes a second full inspiration and holds their breath.
- The central ray should be directed to the level of T7 for both RAO and LAO positions.
- The right PA oblique projection (RAO position) provides the best view of the left atrium and the entire left bronchial tree.
- When viewing PA oblique images, the patient's left side should face the viewer’s right side.
- In PA oblique chest images taken in the LAO position, the left lung will be partially superimposed by the spine.
- True statements about oblique images include that the heart and mediastinal structures should be clearly demonstrated within the lung field of the elevated side at a 45-degree rotation.
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Test your knowledge on PA oblique projections, specifically focusing on the RAO and LAO positions. These flashcards will cover key concepts, including the side of interest and proper placement of the IR. Perfect for students and professionals in radiography.
