RASTER Project

Title	Rasterstereography: a 3D radiation-free tool to evaluate scoliosis angle in patients with adolescent idiopathic scoliosis
Dates	From 2013
Principal investigator	Romain Dayer (UNIGE/HUG)
Other investigators	Anne Tabard-Fougère (K-Lab, UNIGE/HUG), Alice Bonnefoy-Mazure (K-Lab, UNIGE/HUG), Stéphane Armand (K-Lab, UNIGE/HUG), Pierre Lascombes (UNIGE/HUG)
Institutional collaborations	Not applicable.
Funding	PRD 11-2013-I (50 000CHF) , Fondation Privée des HUG (100 000 CHF) , DePuy Synthes (83 438 CHF)
Keywords	Rasterstereography; Adolescent idiopathic scoliosis; Cobb angle
Website	Not available.
Related articles	Tabard A, Bonnefoy A, Dhouib Chargui A, Valaikaite R, Armand S, Dayer ROP. Radiation-free measurement tools to evaluate sagittal parameters in AIS patients: a reliability and validity study. European Spine Journal. 2019;28(3):536-543. Tabard A, de Bodman C, Bonnefoy A, Dayer ROP. Rasterstereography for the follow-up of AIS patients. In: Scoliosis: Diagnosis, Classification and Management Options. Nova Science Publishers, Inc.; 2018. pp. 365-375

Abstract
Adolescent idiopathic scoliosis (AIS) is a three dimensional spine deformity affecting 2-4% of the population including 80% of women. Treatment is based on the evolution of the scoliosis curve and involves frequent repetitive radiological assessment, which has been associated with a long-term increase in mortality from breast cancer. Low-dose biplanar radiography was initially supposed to reduce 80 to 90% of radiation dose. It has finally been demonstrated to reduce it only by 50%. Radiation-free system (like rasterstereography, based on spine surface topography) has hence a high potential for use in monitoring spinal deformity.


This project aimed first to evaluated inter and intra-rater reliability of rasterstereography and to evaluate correlation with gold stand 2D low-dose radiography measurement of Cobb angle. Secondly, this project aimed to evaluate the diagnostic accuracy of rasterstereography. Thirdly, this project aimed to evaluate feasibility of rasterstereography for monitoring curve progression in AIS patients in comparison with gold standard in a longitudinal cohort study.