In DXA spine positioning, the scan commonly extends from the T12 vertebra to which landmark?

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Multiple Choice

In DXA spine positioning, the scan commonly extends from the T12 vertebra to which landmark?

Explanation:
In spine DXA, the scan range is standardized by using a reproducible external landmark for the lower limit. The commonly used lower boundary is the iliac crest, with the scan extending up to the thoracic region (around T12). The iliac crest is chosen because it’s easy to locate and aligns with the lower portion of the lumbar spine (roughly near L4–L5), allowing consistent capture of the upper lumbar vertebrae (the ones most informative for osteoporosis assessment) while minimizing pelvic artifacts. This standardization helps ensure that serial scans are comparable and align with reference databases.

In spine DXA, the scan range is standardized by using a reproducible external landmark for the lower limit. The commonly used lower boundary is the iliac crest, with the scan extending up to the thoracic region (around T12). The iliac crest is chosen because it’s easy to locate and aligns with the lower portion of the lumbar spine (roughly near L4–L5), allowing consistent capture of the upper lumbar vertebrae (the ones most informative for osteoporosis assessment) while minimizing pelvic artifacts. This standardization helps ensure that serial scans are comparable and align with reference databases.

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