数字X线摄影对比平衡滑块控件在诊断老年胸腰段椎体病变中的临床应用

目的探讨数字X线摄影对比平衡滑块控件在诊断老年胸腰段椎体病变中的临床应用价值。方法胸腰段椎体病变老年病患76例均采取数字X线摄影检测,并结合实际胸腰段椎体病变状况应用对比平衡滑块控件调整,保证病灶点位骨质影像数据的准确性,探析应用对比平衡滑块控件技术前后影像质量情况。结果在常规数字X线摄影胸腰段椎体正位摄片的甲级片率与对比平衡滑块控件优化后差异不明显(P>0.05);但是在胸腰段椎体侧位摄片图像中对比平衡滑块控件优化后甲片率明显优于常规数字X线摄影(P<0.05);将数字X线摄影对比平衡滑块控件优化后的胸腰段椎体病变诊断结果作为金标准评估常规数字X线摄影诊断准确率,结果表明常规数字X线摄影检测漏诊率为17.11%(13/76)、误诊率5.26%(4/76)。结论数字X线摄影对比平衡滑块控件诊断老年胸腰段椎体病变准确率较高,影像清晰度、对比度均得到明显的提升,可减少漏诊、误诊。

数字X线摄影对比平衡控件在诊断老年胸腰段椎体病变中的临床应用价值

目的：探讨数字X线摄影对比平衡滑块控件在诊断老年胸腰段椎体病变中的临床应用价值。方法收集我院2010～2013年拍摄的100例老年胸腰段椎体数字X线摄影影像资料，回顾性调整对比平衡控件后，对调整前后的图像质量进行分析比较。结果通过调节对比平衡滑块控件后，各数字X线摄影片上椎体细节影像显示优于未调整前的影像，甲级片率较调节前提高23%。结论运用对比平衡滑块控件显著提高了老年胸腰段椎体数字X线摄影的影像质量，为疾病的正确诊断提供了更可靠的影像依据。

Biomass Vapogasification in Fluidized Bed： Modelling of Char Population Balance and Experimental Validation

The article presents a population balance model by mass developed for studying char gasification by steam occuring in a fluidized bed. The model has been validated by comparison with existing theoretical and experimental cases. Its main goal is to have a better understanding on particles size distribution behaviour during operation of the fluidized bed, and in particular to be applied on the case of Fast Internally Circulating Fluidized Beds for char gasification. Results have shown that the initial properties of the fluidized bed particles （bed and size distribution） are almost not involved in the steady state obtained in continous operation, which is excusively dependent on the properties of the fed particles flow rate and size distribution, the withdrawal flow rate and the reaction properties. Morevoer, it has been proven that the steady state fluidized bed mass and size distribution may be theroretically controlled by an adequate choice of feeding and withdrawal flow rates.