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The bone mineral density (BMD) of the lumbar vertebrae was measured in posteroanterior (PA) projection.
If only frontal radiographs are required, a PA projection is used to lessen the radiation dose to the breasts and gonads.
On the other hand, if one becomes familiar with PA projection, multiple X-ray projections are seldom needed.
In the context of CLBP, lateral-projection DXA may be a more appropriate method to measure vertebral bone mineral than postero-anterior (PA) projection DXA.
DXA variables of interest included L3 BMC (PA and lateral projection), L3 aBMD (PA and lateral projection), total spine BMC and aBMD (PA projection), and L3 width-adjusted ap.vBMD (lateral projection).
Overall, in an unshielded environment, and for a posteroanterior (PA) projection, the exposure is greatest below the table, less at the operator's waist level, and least at the eye level.
Similar(53)
The T-scores for the PA-projection total spine parameters were also acquired.
This association was not observed for DXA-parameters acquired from a PA-projection scan, nor among females.
Notably, no significant decrease was observed for aBMD acquired using PA-projection DXA, consistent with our data.
As expected, in both groups males had significantly greater unadjusted total spine BMC, and PA-projection L3 BMC than females (p < 0.05).
Moreover, age-related degenerative changes in the lumbar spine may obscure any association with CLBP when aBMD is measured using PA-projection methods.
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