目的:探讨双能X线骨密度仪(dualenergyX-rayabsorptiometry,DXA)测量骨密度的准确性。方法:用DXA(前后位扫描)测量5具浸泡在15cm水深中的猪腰段脊柱,共计20例椎骨,计算测量的结果与灰重及灰重密度相关性。结果:骨矿含量与灰重呈显著正相关性(r=0.95,P<0.01),而骨密度与灰重无明显相关性(r=0.41,P>0.05)。结论:DXA测量骨密度中骨矿含量较准确,而骨密度较差。 Objective: To investigate the accuracy of measuring bone mineral density by dualenergy X-ray absorptiometry (DXA). Methods: Five pigs lumbar spine immersed in 15cm water depth were measured by DXA (anteroposterior and posterior position scanning), a total of 20 vertebrae. The correlation between the measured results and the gravimetric density and the gravimetric density was calculated. Results: There was a significant positive correlation between bone mineral content and ash weight (r = 0.95, P <0.01). There was no significant correlation between bone mineral density and ash weight (r = 0.41, P> 0.05). Conclusion: The bone mineral content in DXA is more accurate and the bone mineral density is worse.