Table 1.

Canfield’s Vectra devices.

Vectra Device	Calibration	Features
H1	Does not require a pre-calibrated coordinate system. Features a targeting system consisting of two converging green lights projected onto the subject’s face. Overlap of both lights indicates the correct shooting distance was obtained.	A single camera. A non-ionizing and handheld device that does not require any specific environment. It requires three consecutive acquisitions (two three-quarter profiles and a frontal one) in order to generate a 3D model [1].
M3	Needed	Six cameras divided into three modules assembled on a triangular rigid structure. The capture system has a geometric resolution of 1.2 mm (polygon edge length), 3.5 milliseconds of capture time, intelligent flash units (on-board modular), passive stereophotogrammetry technology, ground support, a footstool and a Dell computer [9].
M5 360	Needed	Five pods of cameras placed at different angulations from the subject. Each pod contains one color camera and one monochrome camera. These two-dimensional (2D) digital cameras capture the image simultaneously. Capture time is less than 2 ms [10].
XT	Needed	Three pods with a total of six cameras [11].