The conventional method for measuring small objects in three dimensions utilising close range stereo photogrammatic techniques is complex and time consuming. A recent development called the Reflex Metrograph allows unskilled operator to collect three dimensional co-ordinates both simply and rapidly. A clinical application to compare in vivo and in vitro measurements showed a similar level of precision. The results compare favourably with a conventional approach.
G. W. Butcher,
C. D. Stephens,
"Rapid Three-Dimensional Measurements In Clinical Dentistry-A New Approach", Proc. SPIE 0361, Biostereometrics '82, (12 July 1983); doi: 10.1117/12.965995; https://doi.org/10.1117/12.965995