目的探讨7.5MHz超声与3.5MHz超声诊断急性阑尾炎的特点及比较分析。方法选用3.5MHz凸阵探头和7.5MHz线阵探头,分别对96例健康人和121例患者进行右下腹超声对比检查,并与患者手术结果对照。结果3.5MHz探头,正常阑尾显示率0%,病变阑尾显示率为34.5%;7.5MHz探头,正常阑尾显示率为34.4%,病变阑尾显示率93.4%。结论高频超声比普通频率超声对急性阑尾炎上的诊断准确率更高,具有重要的临床诊断价值。 Objective To investigate the characteristics and comparative analysis of acute appendicitis diagnosed by 7.5 MHz ultrasound and 3.5 MHz ultrasound. Methods 3.5MHz convex array probe and 7.5MHz linear array probe were used in this study. The right lower quadrant ultrasound examination was performed on 96 healthy subjects and 121 patients, respectively. The results were compared with those of the patients. Results 3.5MHz probe, the normal appendix display rate of 0%, appendix lesions showed rate of 34.5%; 7.5MHz probe, the normal appendix display rate was 34.4%, appendix lesions showed 93.4%. Conclusions High-frequency ultrasound is more accurate than acute ultrasound in the diagnosis of acute appendicitis, which has important clinical diagnostic value.