Where Is the Central Ray (CR) Centered for an AP

question 45

Multiple Choice

Where is the central ray (CR) centered for an AP projection of the lumbar spine with a 14- × 17-inch (35- × 43-cm) IR?

• A)At the iliac crest
• B)At the ASIS
• C)1 to 1.5 inches (2.5 to 3 cm) above the iliac crest
• D)At the lower costal margin

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