双源CT双能量扫描碘图在肾脏占位中的应用

目的 探讨双源CT双能量扫描碘图在肾脏占位中的应用价值.方法 回顾性分析2016年1月至2017年12月我院肾外科收治的68例肾脏占位患者的临床资料,根据检查方法不同分为研究组和对照组,对照组(n=32)行常规CT平扫,研究组(n=36)行双源CT双能量增强检查.获得常规平扫图像和扫描碘图,以病理学检查为金标准,比...

Iodine Map of Dual-source Dual-energy CT for the Diagnosis of Renal Space-occupying Lesions

Objective To investigate the effect of the iodine map of dual-source dual-energy CT for the diagnosing renal space-occupying lesions.Methods The clinical data of 68 cases of renal space-occupying patients admitted to our hospital from January 2016 to December 2017 were retrospectively analyzed,and patients were divided into study groups and control groups according to different examination methods.The control group(n=32)underwent conventional CT plain scan and the study group(n=36)underwent dual-source dual-energy CT.Thereafter,the characteristics of conventional plain scan images and iodine maps were compared with pathologic findings as to the gold standard.Mean CT values,signal-to-noise ratio(SNR),contrast-to-noise ratio(CNR),iodine concentration,image quality,and contrast enhancement rate of renal ca rcinoma,renal hama rtoma,and renal cyst were compa red between the two groups.The mean CT values of dual-phase enhancement on iodine-enhanced image for the enlarged kidney tumor lesions derived from different pathological changes were compared to conclude the enhanced characteristics for the different pathological enlarged kidney tumor lesions.Then the ROC curve was used to determine the effect of mean CT value for differentiating the benign and malignant cervical tumor of the kidney.Results The mean CT value,SNR,CNR,iodine concentration,image quality,and contrast enhancement rate of renal carcinoma,renal hamartoma and renal cyst we re statistically different between the two groups(P<0.05).Univariate AN OVA showed statistically significant differences in the indicators of renal cancer,renal hamartoma and renal cyst in the study group(P<0.05).Pairwise comparison showed statistical differences in the indicators between the two groups(P<0.05).In the energy spectrum of renal hama rtoma,renal cell ca rcinoma,and renal cyst,the CT value decreased with the increase of single energy;the slope of the energy spectrum cu rve of renal cell ca rcinoma,renal hama rtoma,and the renal cyst was statistically different(P<0.05);One-way analysis of variance showed statistically significant differences in the slopes of renal cancer,renal hamartoma,renal cyst,and normal kidney tissue(P<0.05).The sensitivity and specificity of dual-energy scanning for diffe rential diagnosis of different renal lesions were higher than those of conventional plain scan(P<0.05).Conclusion The iodine map of dual-source dual-energy CT examination can directly and accurately evaluate the cha racteristics of renal space-occupying lesions and as differentiate the benign and malignant cervical tumor through quantitative analysis of energy spectrum curves and iodine concentrations of renal cancer,renal hama rtoma,and renal cyst.