A PA Chest Projection with Poor Positioning Demonstrates the Scapulae

question 69

Multiple Choice

A PA chest projection with poor positioning demonstrates the scapulae in the lung field and elevated lateral clavicular ends. How should the patient be repositioned for an optimal projection to be obtained?
1) Tilt the upper midcoronal plane away from the IR.
2) Depress the shoulders.
3) Coax the patient into a deeper inspiration.
4) Anteriorly rotate the shoulders and elbows.

• A) 1 and 4 only
• B) 2 only
• C) 2, 3, and 4 only
• D) 2 and 4 only

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Definitions:

LRMC

Long-Run Marginal Cost, which is the additional cost of producing one more unit of output when all inputs, including capital, are variable.

LRAC

Long-Run Average Cost, a curve that shows the lowest possible average cost of production, allowing all factors of production to vary.

Long-run Elasticities

Measure of responsiveness of demand or supply to changes in price or income, considered over a period long enough for all adjustments to be made.

Short-run Elasticities

Measures of how responsive the quantity demanded or supplied of a good is to a price change over a short period.