容积高分辨CT对肺弥漫病变显示能力的评价

Evaluation of Volumetric High-resolution CT in Demonstrating Diffuse Lung Diseases

目的评价容积高分辨CT(VHRCT)对肺弥漫病变的显示能力,探讨VHRCT取代传统高分辨CT(CHRCT)的可行性。资料与方法102例肺弥漫病变患者行VHRCT及CHRCT检查,比较二者的图像质量,包括图像的伪影、分辨能力及噪声水平;选择无明显呼吸伪影的层面,比较二者对于线状影及网状影、微结节影及树芽征、细支气管扩张、磨玻璃影、肺气肿5种肺弥漫病变征象的显示情况。结果图像质量比较:VHRCT与CHRCT的图像分辨能力及噪声水平差异均无统计学意义(P=0.317,P=0.091);CHRCT的呼吸伪影较VHRCT明显,二者伪影评分差异有统计学意义(P=0.008)。在无明显呼吸伪影的层面中,VHRCT与CHRCT对线状影及网状影、微结节影及树芽征、细支气管扩张、磨玻璃影、肺气肿显示情况评分差异均无统计学意义(P=0.729,P=0.603,P=0.189,P=0.672,P=0.541)。结论 VHRCT对于肺弥漫病变的显示能力与CHRCT接近,可以通过一次螺旋扫描得到全肺的高分辨率图像,其取代CHRCT具有可行性。

Purpose To evaluate the ability of volumetric high-resolution CT（VHRCT） in demonstrating detail of diffuse lung diseases.Materials and Methods 102 patients with diffuse lung diseases undertook VHRCT and conventional highresolution CT（CHRCT） scan.The image quality,including artifacts,resolution and noise,was compared between VHRCT and CHRCT.CT findings of linear or reticular opacities,micronodules,tree-in-bud patterns,bronchiolectasis,ground-glass opacities（GGO） and emphysema were compared on images without obvious breathing artifacts between VHRCT and CHRCT.Results There was no significant difference of resolution and noise between VHRCT and CHRCT（P=0.317,P=0.091）.There were more breathing artifacts in CHRCT than in VHRCT（P=0.008）.On images without obvious breathing artifacts,there was no significant difference between the two scan modes to demonstrate linear or reticular opacities,micronodules,tree-inbud patterns,bronchiolectasis,ground-glass opacities and emphysema（P=0.729,P=0.603,P=0.189,P=0.672,P=0.541）.Conclusion The ability of VHRCT in demonstrating diffuse lung diseases is comparable to that of CHRCT.It is feasible for VHRCT to replace CHRCT due to sufficient HRCT images quality obtained by only one helical scan.