孤立肺结节的增强CT诊断新进展

孤立肺结节(SPN)的增强CT诊断是近年来研究热点之一,检查方法分为动态和多期增强扫描两类,以SPN的强化程度、结节-主动脉强化值比(S/A)、时间-密度曲线类型、灌注值、强化模式、肿瘤血管征等作为诊断依据。以强化值<15HU、S/A<6%为界值,可区分出良性结节;时间-密度曲线类型有助于恶性与炎性结节的鉴别;肿瘤血管征可作为特异性诊断指征;包膜样强化或内壁规则的周围强化高度提示结核的诊断。

New progress of enhancement CT diagnosis in solitary pulmonary nodules

By contrast CT to diagnosing solitary pulmonary nodules became a study hot spot in a few years.There are two types checking methods:dynamic enhancement CT and multi-phase enhancement CT.The extent of contrast attenuation,SPN-to aorta enhanced ratio,time-attenuation curve pattem,perfusion value,enhancement pattern,and tumor vascular sign can be regarded as diagnostic basis.The contrast attenuation value which is olwer than 15HU,and SPN-to-aorta enhanced ratio which is olwer than 6%,indicate benign nodule;Time-attenuation curve pattern is helpful to different malignant from inflammatory nodule;Tumor vascular sign can be regarded as a specific feature of lung cancer;Regular peripheral enhancement clue intensively tuberculoma.