Tan Li-lian, Li Yang-bin, Li Shu-xin, Jiang Jin-dai, Li Zhi-ming, Huang Shi-zhang, Peng Pin-xian
CT Division, the Second Affiliated Hospital of Guangzhou Medical College, Guangzhou 510260, China.
Zhonghua Zhong Liu Za Zhi. 2004 May;26(5):308-11.
To evaluate the value of three-phase pulmonary helical CT in diagnosing peripheral pulmonary cancer (diameter </= 3 cm).
Serial single-slice dynamic scans were obtained with helical CT before and after injection of 100 ml contrast material in 60 patients with solitary pulmonary nodules (SPNs, diameter <or= 3 cm). The three-phase pulmonary helical CT was established by analyzing enhancement feature of thoracic aorta and pulmonary artery, and then the enhancement feature of three-phase pulmonary helical CT was analyzed.
The delayed times of three-phase pulmonary helical CT were pulmonary artery phase (15 second), bronchial artery phase (36 second), equilibrium phase (90 second) respectively. The prevalence model of density change for three-phase pulmonary helical CT: no enhancement, marked enhancement, moderate-enhancement in pulmonary cancer; slight or moderate-enhancement, marked-enhancement, marked-enhancement in inflammatory nodules; no enhancement or light-enhancement in tuberculoma and metastatic nodules. The enhanced branch and small spot vessels were demonstrated by bronchial artery phase in 82.9% of pulmonary cancer nodules.
The three-phase pulmonary helical CT could reflect the enhancement feature, blood supply of bronchial artery in peripheral pulmonary cancer (diameter </= 3 cm), it is helpful in early diagnosis and differentiation.
评估螺旋CT三期扫描在诊断周围型肺癌（直径≤3 cm）中的价值。
对60例孤立性肺结节（直径≤3 cm）患者，静脉注射100 ml对比剂后行螺旋CT单层面动态扫描，通过分析胸主动脉及肺动脉强化特点确定螺旋CT三期扫描时间，并分析三期扫描图像上肺结节的强化特点。
螺旋CT三期扫描时间分别为肺动脉期（15秒）、支气管动脉期（36秒）、平衡期（90秒）。三期扫描肺结节密度变化模式为：肺癌表现为无强化、明显强化、中等强化；炎性结节表现为轻度或中等强化、明显强化、明显强化；结核瘤及转移瘤表现为无强化或轻度强化。82.9%的肺癌结节在支气管动脉期可见增粗的分支及小斑片状强化血管。
螺旋CT三期扫描能反映周围型肺癌（直径≤3 cm）的强化特点及支气管动脉供血情况，有助于周围型肺癌的早期诊断及鉴别诊断。
