Objective To evaluate the value of 3-D reconstruction in multi-detector spiral CT urography (MDCTU) for diagnosing upper urinary tract diseases (UUTDs) by means of both diagnostic sensitivity and ROC curve. Methods A total of 41 patients with UUTD were collected. All of them took MDCTU as well as reconstructions including MPR, MIP and VR. Compared with golden standards, the diagnostic value of MDCTU, MPR, MIP and VR were evaluated using both diagnostic sensitivity and ROC curve. Results a) A total of 49 upper urinary tract lesions were detected in those 41 patients; b) For UUTD, the localization diagnostic sensitivities of MPR, MIP, and VR were 48/49 (98.0%), 27/49 (53.2%), and 19/49 (38.8%), respectively; while their qualitative diagnostic sensitivities were 47/49 (95.9%), 17/49 (34.7%), and 13/49 (26.5%), respectively; the differences between MPR and the others were significantly (Plt;0.05); c) For distinguishing benign from malignant lesions, the Az value (area under ROC curve) of MPR, MIP, and VR were 0.998, 0.736 and 0.669, respectively; the differences between MPR and the others were significant (Plt;0.05); and d) MPR was completely the same as MDCTU in both diagnostic sensitivity and Az value. Conclusion The common 3-D reconstructions in MDCTU were different in value. MPR is highest in the diagnostic efficiency, which is similar to MDCTU, and is regarded as the basis of diagnosis; while MIP and VR are more stereo and intuitive. So it shows that the comprehensive application of CTU 3-D reconstructions has important value for diagnosing UUTD and distinguishing benign from malignant.
Objective To explore the effect factors on the related measurement guidelines of renal area and renal cortex thickness by measurement of CT/MRI radiography in vivo kidney in adults. Methods Thickness of renal cortex (TC), cortical area (CA), parenchymal area (PA), as well as cortical faction (CF, cortical/parenchymal area) of 164 cases (106 cases with enhanced CT abdomen and 58 cases with MRI abdomen scanning) without renal disease was calculated bilaterally. All data were analyzed by SPSS 11.5 (the mean of two groups and multi-groups was compared by t test and analysis of variance, respectively).Results ① In CT scan, the mean value and 95% confidence interval of TC，CA，PA and CF were 0.62 (0.44 to 0.80) cm, 7.2 (4.1 to 10.2) cm2, 18.2 (10.7 to 25.7) cm2, 39.3 (30.3 to 48.3) % on the left, and 0.63 (0.43 to 0.83) cm, 7.3 (4 to 11) cm2, 18.1 (11 to 25.3) cm2, 39.9 (32 to 48) % on the right, respectively. Likewise, in MRI, those were 0.58 (0.33 to 0.83) cm, 7.5 (3.5 to 11.3) cm2, 14.8 (8.5 to 21.1) cm2, 50.2 (32.8 to 67.6) % on the left, and 0.55 (0.31 to 0.79) cm, 7.3 (4.4 to 10.3) cm2, 15.6 (10.1 to 21.1) cm2, 47.3 (30 to 65) % on the right. ② There was a significant difference in the value of TC, CA, PA between different gender and age groups, and were decreased with the age increaseing. ③ Most of the values measured by MRI were less than those by CT. Conclusions The study suggests that the values of TC, CA, PA and CF can well represent the renal size and function, and may offer a practical and significant normal standard in the radiological diagnosis.