Technical improvement of CPT (Complex Phase Tracing) profilometry in scoliosis

The prototype of a portable instrument for shape measurement and analysis o f the human back has been developed. The new principle applied for fringe p attern analysis is based on the registration of two mutually out-of-phase p atterns, use of the Fourier transform with corrected intrinsic border-error s and on fringe pattern demodulation based on Complex Phase Tracing method. The software includes correction of distortion of the observation lens, da ta calibration, three-dimensional Z-axis rotation of the patient normalizin g his position, calculus of the curvature map (second derivative) enabling precise indication of the PSIS points, color-map and contour representation of the calculated 3D form as well as calculus and presentation of the natu ral image of the patient.