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Dagnosis of Solitary Pulmonary Nodules Using CT Volume Rendering：a preliminary report
李惠民 肖湘生 刘士远 于红 李成洲 杨春山
第二军医大学附属长征医院影像科
LI huimin，XIAO xiangsheng，LIU shiyuan，et al. Department of Imageology，Changzheng hospital，the Second Military Medical University，Shanghai 200003
Abstract
Objective：To evaluate the value of volume rendering technique（VR）in diagnosis of solitary pulmonary nodules（SPN）.
Methods：Thirty－two peripheral pulmonary cancer（PPC）and 30 non－PPC nodules which diameter was no more than 30mm were collected. The applying parameters of a multislice CT scanner were 1.0mm－collimation，1.3mm－slicethickness，0.6mm－interval，and 180～220mm FOV. VR were applied in every nodule.
Results：the most lesion of PPC and non－PPC nodules were round. Irregular in transaxial images but round in VR were only seen in 7 PPC. 16 PPC lesion with typical lobulation were shown multiple－nodule in VR，which was not seen in non－PPC. The occurrency rate of lobulation，spiculation，convergence，and pleural indentation in PPC were more frequency than that in non－PPC.
Conclusion：VR could reveal the configuration characteristic of SPN and help its diagnosis.
Key words：Solitary pulmonary nodules（SPN）；Peripheral pulmonary carcinoma（PPC）；Volume rendering（VR）.
随着CT技术的进步，小肺癌的研究已经相当深入，关于肺结节形态学诊断价值的研究也达到了一个较高水平。已有文献确认HRCT和CT靶扫描有助于肺结节尤其小结节的细节影像显示，帮助提高诊断准确率[1，2]，多层面重建（multiple planar reconstruction，MPR）和三维表面遮盖显示（three dimensional surface shaded display，3D－SSD）图像对肺癌的诊断价值也得到了人们的肯定，主要在于显示肺结节形态、分叶、毛刺，以及肺癌与肺血管、胸膜、纵隔（包括纵隔内淋巴结）等的关系[3～6]；容积显示（volume rendering，VR）是一种不同于SSD的三维图像技术，近年才得到较大发展，特点是提供具有密度层次、三维空间关系的伪彩影像，本研究拟讨论其在孤立肺结节（solitary pulmonary nodules，SPN）诊断中的价值。 | 
