When scanning a lumbar spine,what is one of the external landmarks used for placement of the central ray?

Question

Quizplus · Accepted Answer

The iliac crest is a bony protrusion located at the top of the hip bones, and is commonly used as an external landmark for placement of the central ray when imaging the lumbar spine. The central ray is typically directed to a point 2 cm below the iliac crest. This helps to ensure that the radiographic image includes the entire lumbar spine, as well as the sacrum and the upper portion of the coccyx.

When Scanning a Lumbar Spine,what Is One of the External