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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。
Enhanced CT diagnosis of isolated pulmonary nodules (SPNs) is one of the hot spots in recent years. The examination methods are divided into two groups: dynamic and multi-phase enhanced scans. SPN enhancement, nodular-aortic enhancement ratio (S / A ), Time-density curve type, perfusion value, enhancement mode, tumor blood vessel sign as the basis of diagnosis. To strengthen the value of <15HU, S / A <6% for the cut-off value, can distinguish benign nodules; time-density curve type contribute to the identification of malignant and inflammatory nodules; tumor vascular signs can be used as a specific diagnostic indications ; Envelope-like enhancement or the rules of the surrounding wall to strengthen the height of the tuberculosis diagnosis prompted.