目的:探讨早期成人股骨头缺血坏死(femoral head necrosis,FHN)的MR、CT、SPECT和X线平片4种影像学检查的成本效益比,寻找较好的成本效益的检查方法。方法:分析和总结82例129髋随访和病理证实或具有典型影像学表现的早期(ARCO I^II期)成...目的:探讨早期成人股骨头缺血坏死(femoral head necrosis,FHN)的MR、CT、SPECT和X线平片4种影像学检查的成本效益比,寻找较好的成本效益的检查方法。方法:分析和总结82例129髋随访和病理证实或具有典型影像学表现的早期(ARCO I^II期)成人FHN病人的髋关节影像学资料。全部病例均同期行MRI、CT、单光子发射计算机体层摄影(single photon emission computed tomography,SPECT)和X线平片检查。采用成本效果分析法(cost-effectiveness analysis,CE A),对4种影像学检查诊断效率研究中的数据进行分析,比较其正确检出费用(cost of accurate diagnosis,CAD)。结果:4种影像学检查方法的诊断差异有显著性意义。早期诊断成人FHN的检出费用最低的是X线平片,对于X线平片确诊组和诊断可疑组,MRI检出费用并无太大变化,而CT费用最低;对于X线平片诊断阴性组,MRI诊断的敏感性和准确性综合比较高于CT和SPECT,且诊断费用也最低。结论:X线适合早期股骨头坏死的筛选,而MRI诊断的敏感性和准确性综合比较高于CT和SPECT,而且应当作为X线诊断阴性的可疑股骨头坏死患者进一步诊断的首选。。展开更多
Composite materials are increasingly used in the aerospace industry.To fully realise the weight saving potential along with superior mechanical properties that composites offer in safety critical applications,reliable...Composite materials are increasingly used in the aerospace industry.To fully realise the weight saving potential along with superior mechanical properties that composites offer in safety critical applications,reliable Non-Destructive Testing(NDT)methods are required to prevent catastrophic failures.This paper will review the state of the art in the field and point to highlight the success and challenges that different NDT methods are faced to evaluate the integrity of critical aerospace composites.The focus will be on advanced certificated NDT methods for damage detection and characterization in composite laminates for use in the aircraft primary and secondary structures.展开更多
文摘目的:探讨早期成人股骨头缺血坏死(femoral head necrosis,FHN)的MR、CT、SPECT和X线平片4种影像学检查的成本效益比,寻找较好的成本效益的检查方法。方法:分析和总结82例129髋随访和病理证实或具有典型影像学表现的早期(ARCO I^II期)成人FHN病人的髋关节影像学资料。全部病例均同期行MRI、CT、单光子发射计算机体层摄影(single photon emission computed tomography,SPECT)和X线平片检查。采用成本效果分析法(cost-effectiveness analysis,CE A),对4种影像学检查诊断效率研究中的数据进行分析,比较其正确检出费用(cost of accurate diagnosis,CAD)。结果:4种影像学检查方法的诊断差异有显著性意义。早期诊断成人FHN的检出费用最低的是X线平片,对于X线平片确诊组和诊断可疑组,MRI检出费用并无太大变化,而CT费用最低;对于X线平片诊断阴性组,MRI诊断的敏感性和准确性综合比较高于CT和SPECT,且诊断费用也最低。结论:X线适合早期股骨头坏死的筛选,而MRI诊断的敏感性和准确性综合比较高于CT和SPECT,而且应当作为X线诊断阴性的可疑股骨头坏死患者进一步诊断的首选。。
基金the support of NVIDIA Corporation with the donation of the Titan Xp GPU used for this researchsupported by EPSRC grant EP/R002495/1the European Metrology Research Programme through grant 17IND08。
文摘Composite materials are increasingly used in the aerospace industry.To fully realise the weight saving potential along with superior mechanical properties that composites offer in safety critical applications,reliable Non-Destructive Testing(NDT)methods are required to prevent catastrophic failures.This paper will review the state of the art in the field and point to highlight the success and challenges that different NDT methods are faced to evaluate the integrity of critical aerospace composites.The focus will be on advanced certificated NDT methods for damage detection and characterization in composite laminates for use in the aircraft primary and secondary structures.
