  The EOS(R) scanner is a radiographic system that captures PA and lateral
images in standing posture. The system is widely used in diagnosis and
assessment of scoliosis, as it provides a low-dose alternative to traditional
X-ray and can capture full-body images. Furthermore, spacial calibration
between the two imaging views is implemented in hardware, facilitating 3D
reconstruction of imaging targets. In this paper, a brief description of the
system is followed by an explanation of the geometric relationship between 3D
space and radiographic image space.
