目的比较不同重建层厚的各种图像后处理技术对肺动脉栓子的显示及诊断价值。方法收集40例经多层螺旋CT肺动脉成像检查并经临床及实验室检查确诊的肺动脉栓塞(PE)图像资料,利用原始数据分别行层厚0.625、1.25、2.5、5.0 mm重建图像,然后...目的比较不同重建层厚的各种图像后处理技术对肺动脉栓子的显示及诊断价值。方法收集40例经多层螺旋CT肺动脉成像检查并经临床及实验室检查确诊的肺动脉栓塞(PE)图像资料,利用原始数据分别行层厚0.625、1.25、2.5、5.0 mm重建图像,然后运用多平面重组(MPR)、最大密度投影(MIP)及容积成像(VR)3种图像后处理方法对于在不同层厚的各级肺动脉显示及其栓子分布情况进行观察分析。结果本组40例PE均为双肺多发肺栓塞,共累及各级肺动脉分支409处,范围从肺动脉主干至亚段动脉。40例PE中,对亚段动脉栓子检出率,0.625、1.25、2.5 mm MPR图像和MIP图像的差异无统计学意义,5 mm MPR、5 mm MIP及VR图像对亚段动脉栓子显示较0.625、1.25、2.5 mm MPR及MIP图像差异有统计学意义。结论肺栓塞的诊断主要依靠薄层横断图像,对亚段动脉栓子的观察至少要用2.5 mm重建层厚的MPR或MIP图像,两者任选择一项即可。而1.25 mm层厚对亚段动脉栓子不易漏诊,且能大大地提高观察者阅片速度,故1.25 mm层厚的MPR或MIP为最佳成像方法。展开更多
Molecular imaging(MI)can provide not only structural images using traditional imaging techniques but also functional and molecular information using many newly emerging imaging techniques.Over the past decade,the util...Molecular imaging(MI)can provide not only structural images using traditional imaging techniques but also functional and molecular information using many newly emerging imaging techniques.Over the past decade,the utilization of nanotechnology in MI has exhibited many significant advantages and provided new opportunities for the imaging of living subjects.It is expected that multimodality nanoparticles(NPs)can lead to precise assessment of tumor biology and the tumor microenvironment.This review addresses topics related to engineered NPs and summarizes the recent applications of these nanoconstructs in cancer optical imaging,ultrasound,photoacoustic imaging,magnetic resonance imaging(MRI),and radionuclide imaging.Key challenges involved in the translation of NPs to the clinic are discussed.展开更多
文摘目的比较不同重建层厚的各种图像后处理技术对肺动脉栓子的显示及诊断价值。方法收集40例经多层螺旋CT肺动脉成像检查并经临床及实验室检查确诊的肺动脉栓塞(PE)图像资料,利用原始数据分别行层厚0.625、1.25、2.5、5.0 mm重建图像,然后运用多平面重组(MPR)、最大密度投影(MIP)及容积成像(VR)3种图像后处理方法对于在不同层厚的各级肺动脉显示及其栓子分布情况进行观察分析。结果本组40例PE均为双肺多发肺栓塞,共累及各级肺动脉分支409处,范围从肺动脉主干至亚段动脉。40例PE中,对亚段动脉栓子检出率,0.625、1.25、2.5 mm MPR图像和MIP图像的差异无统计学意义,5 mm MPR、5 mm MIP及VR图像对亚段动脉栓子显示较0.625、1.25、2.5 mm MPR及MIP图像差异有统计学意义。结论肺栓塞的诊断主要依靠薄层横断图像,对亚段动脉栓子的观察至少要用2.5 mm重建层厚的MPR或MIP图像,两者任选择一项即可。而1.25 mm层厚对亚段动脉栓子不易漏诊,且能大大地提高观察者阅片速度,故1.25 mm层厚的MPR或MIP为最佳成像方法。
文摘Molecular imaging(MI)can provide not only structural images using traditional imaging techniques but also functional and molecular information using many newly emerging imaging techniques.Over the past decade,the utilization of nanotechnology in MI has exhibited many significant advantages and provided new opportunities for the imaging of living subjects.It is expected that multimodality nanoparticles(NPs)can lead to precise assessment of tumor biology and the tumor microenvironment.This review addresses topics related to engineered NPs and summarizes the recent applications of these nanoconstructs in cancer optical imaging,ultrasound,photoacoustic imaging,magnetic resonance imaging(MRI),and radionuclide imaging.Key challenges involved in the translation of NPs to the clinic are discussed.
