Multi-modal ultrasound in diagnosis of renal diseases based on support vector machine / 中国医学影像技术

Objective: To compare the effectiveness of multi-modal ultrasound, including conventional ultrasound, color Doppler ultrasound and shear wave elastic imaging in diagnosis of renal diseases based on support vector machine support vector machine (SVM) and traditional Logistic regression. Methods: Totally 94 patients with pathologically proved renal diseases (RD group) and 109 patients without renal diseases (control group) were collected and examined with conventional ultrasound, color Doppler ultrasound and shear wave elastic imaging, respectively. SVM and Logistic regression were used for modeling. Then all 203 patients were divided into 2 groups according to 3:1, then 153 cases were used as SVM's training samples for single factor variable judgment and model establishment, the other 50 cases were used as validation samples to evaluate the prediction effect of SVM model. Results: The elastic hardness of left renal cortex and the width of right kidney entered the regression equation in Logistic regression. The accuracy of Logistic regression model for diagnosis of renal diseases was 83.74%, of SVM model was 85.10% (χ2=0.17, P=0.68). Conclusion: Multimodal ultrasound has high effectiveness for diagnosis of renal diseases. SVM and Logistic models have similar diagnostic effectiveness.

Contrast enhanced ultrasonogrphy patterns in papillary thyroid carcinoma and correlation between degree of enhancement and tumor invasiveness / 中华超声影像学杂志

Objective To study the enhanced patterns of papillary thyroid carcinoma (PTC)on contrast-enhanced ultrasound(CEUS),and explore the relationship between the degree of enhancement and extracapsular invasionand cervical lymph node metastasis of the tumor.Methods Seventy-three PTCs in 61 patients selected for thyroid surgery underwent conventional ultrasound andcontrast-enhanced ultrasound. The enhanced patterns were analyzed.The differences between different degree enhancement and extracapsular invasion and cervical lymph node metastasis of PTCs were compared.Results Seventy-three PTCs enhanced patterns showed that 52(71 .2%)nodules with hypoenhancement,13(1 7.8%)nodules with isoenhancement,8 (1 1 .0%)nodules with hyperenhancement.Twenty-three (44.2%,23/52 )nodules with extracapsular invasion in hypoenhancing patterns,and 1 5 (71 .4%,1 5/21 ) nodules with extracapsular invasion in isoenhancing or hyperenhancing patterns.There were significant differences between them(P 0.05 ).Conclusions The degree of enhancement are correlate to invasiveness in PTCs,PTCs with isoenhancement or hyperenhancement patterns were more often with extracapsular invasion.