Comparison of color Doppler flow imaging and contrast-enhanced ultrasonography for blood flow detection in renal lesions

Objective To compare the display rate of blood supply in renal lesions between color Doppler flow imaging(CDFI) and contrast-enhanced ultrasonography(CEUS).Methods A total of 432 renal lesions were scanned by CDFI and CEUS during June 2004 to February 2010.All lesions were confirmed by surgical pathology,including 346 malignant tumors and 86 benign tumors.The size,inner echoes,boundary,blood signal of tumors and its location were observed by CDFI.The degree of tumor vascularity was subjectively graded from 0 to Ⅳ.The modality and phase of enhancement,including the arrival time,the peak time,the washout time and enhancement appearance of lesions were studied by CEUS.Results The display rates of blood signal and arterial blood signal in malignant group were higher than those in benign group by CDFI.The grade Ⅲ and grade Ⅳ were the common types in malignant group,as well as the grade 0 and grade Ⅲ being the common types in benign group.The difference in grade of tumor vascularity was significant between malignant and benign groups(P0.01).The total display rate of blood signal in renal lesions by CEUS was higher than CDFI,as well as display rate of blood signal in malignant or benign lesions(P0.05).Conclusion CEUS is better than CDFI in display of blood supply and detection of blood signal.