The application of 3-D scanning in the diagnosis and evaluation of pectus excavatum

Objective To investigate the application of 3-D scanning in the diagnosis and evaluation of pectus excavatum. Methods From July 2016 to June 2017, chest CT concomitant 3-D scanning were performed in 90 pectus excavatum patients before Nuss procudure. Another 30 cases underwent chest CT scanning for non-chest deformity causes were chosen as a control group. The transverse and anterior-posterior maximum diameter through the deepest point of chest wall deformity were measured. The surface topography index and Haller index were calculated respectively. Results There was a positive correlation between CT and 3-D scanning diameters of the transverse and anterior-posterior maximum diameters, and consistency rates were 94% and 82%, respectively. There was significant difference between pectus excavatum group 1.82±0.21 and control group 1.41±0.07 in the STI(P<0.001). There was a positive correlation between Haller index 5.12±3.36 and STI 1.82±0.21, and consistency rate was 89%. The Delong's test showed no significant difference between ROC of HI and STI(Z=1.18, P=0.28). Conclusion 3-D scanning and STI of pectus excavatum is a validated alternative for CT and Haller index, especially in the infant and non-surgical treatment PE cases. Key words: Pectus excavatum Evaluation Three dimensions scanning Surface topography Index