Fig. 2
From: Accuracy of radiographic measurement techniques for the Taylor spatial frame mounting parameters
Lateral view for axial and anteroposterior MP measurements showing the superimposed bolts on an X-ray image without (a, method A) and with (b, method B) calibration as well as on a fluoroscopic intensifier image (c, method C); the axial MP on X-ray image a (170 mm) shows high deviation compared to those on calibrated X-ray image b (159 mm) and fluoroscopic image c (157 mm), whereas the anteroposterior MP shows only a minor deviation of 1 mm (a: 17 mm, b and c: 16 mm)