Objective:To investigate the reliability of tooth color-measuring by using digital cameras.Methods: 3D-Master shade guide system was measured by Canon EOS D60,CRAIC QDI2000 micropectrophotometer and ShadeEye-NCC directly.The data collected from the three methods were analyzed statistically to evaluate the reliability of the data measured by digital cameras.Results:There was no significant difference between the data measured by digital cameras and ShadeEye-NCC statistically;while that existed between the parameters of L* collected by digital cameras and microspectrophotometer were obviously co-related(P

ObjectiveTo evaluate the diagnostic value of multi-slice CT (MSCT) and multi-dimensional reconstructions for congenital pulmonary stenosis (PS) in children.MethodsThe enhanced thin CT images of 33 patients with PS were retrospectively analyzed,the data was transmitted to the workstation for multi-planar reformation ( MPR),volume rendering technique (VRT) and maximum intensity projection (MIP).The CT imaging features of PS were analyzed combining with operation resul ts and Ultrasonic Cardiogram (UCG).ResultsIn 33 cases of PS,there were 17 cases with pulmonary valve stenosis (PVS),10 cases with right ventricular infundibulum stenosis (RVIS),and 6 cases with pulmonary trunk stenosis (PTS).The first two were correctly diagnosed by UCG,5 cases of PVS and Icases of RVIS were correctly diagnosed by MSCTA,the later was correctly diagnosed by UCG and MSCTA.In 14 cases with collateral circulations between aorta and pulmonary artery ( APC ),all were correctly diagnosed by MSCTA,only 3 case was diagnosed by UCG,1 case was misdiagnosed as PDA.UCG can clearly demonstrate the others intra-cardiac deformities,such as ASD,VSD,RVH,PFO,SV,DORV,TECD and TBD,the accuracy rate of MSCTA was 39.4％,and MSCTA can clearly demonstrate the origin,course and diameter of extracardiac vascular abnormalities,such as PDA,RAA,TGA,TAPVD,CoA,PLSV and VLSA,the accuracy rate of UCG was 697％.ConclusionsMSCT and multi-dimensional reconstruction were a kind of non-invasive method,it was a good approach for extra-cardiac vascular malformations and APC in PS.Combining with UCG,it can further be used to improve the diagnostic accuracy of intra-cardiac malformation and supply diagnostic evidence for clinical treatment.