MSCTA诊断肺栓塞扫描延迟方法的探讨

目的 比较多排螺旋CT血管造影（MSCTA）不同扫描延迟方法在肺栓塞（PE）诊断中的应用效果。方法60例临床可疑PE患者随机平均分A、B、C三组，采用相同碘浓度、注射速率、对比剂用量（对比剂浓度300mgI／ml，注射速率3mI／s，注射对比剂60ml后用40ml生理盐水冲刷），并进行MSCTA检查。扫描延迟方法：A组：固定时间法（经验法15s）；B组：小剂量时间-密度曲线测试法；C组：对比剂追踪触发技术。采用最大密度投影（MIP）、多平面重组（MPR）及容积再现技术（VR）对肺动脉栓子数目、部位、形态进行评价，并与DSA结果比较。结果A组MSCTA检查成功率55．00％（11／20）；B、C两组MSCTA检查成功率100％；3组诊断结果与DSA结果比较诊断符合率均为96．04％（291／303）。结论MSCTA诊断PE的最佳扫描延迟方法为对比剂追踪触发技术。

Delayed scanning method in multi-slice spiral CT for diagnosis of pulmonary embolism

Objective To compare different delayed scanning methods in multi-slice spiral CT angiography(MSCTA)in diagnosis of pulmonary embolism(PE).Methods Sixty patients with suspected PE were divided into three groups(A,B and C).MSCT with same Iodine concentration,injection rate,contrast medium but different delayed scanning methods was performed after injection of contrast medium.Patients in group A were examined with fixed time method(15 s),in group B with small dose-density curve method,while in group C with con...