A single camera roentgen stereophotogrammetry method for static displacement analysis.
A new method to quantify motion or deformation of bony structures has been developed, since quantification is often difficult due to overlaying tissue, and the currently used roentgen stereophotogrammetry method requires significant investment. In our method, a single stationary roentgen source is used, as opposed to the usual two, which, in combination with a fixed radiogram cassette holder, forms a camera with constant interior orientation. By rotating the experimental object, it is possible to achieve a sufficient angle between the various viewing directions, enabling photogrammetric calculations. The photogrammetric procedure was performed on digitised radiograms and involved template matching to increase accuracy. Co-ordinates of spherical markers in the head of a bird (Rhea americana), were calculated with an accuracy of 0.12mm. When these co-ordinates were used in a deformation analysis, relocations of about 0.5mm could be accurately determined.
Gussekloo
S W
SW
Section of Evolutionary Morphology, Institute of Evolutionary and Ecological Sciences, Leiden University, P.O. Box 9516, 2300 RA, Leiden, The Netherlands. Gussekloo@RULSFB.LeidenUniv.NL
Janssen
B A
BA
George Vosselman
M
M
Bout
R G
RG
D000818:Animals; D001502:Beak / Q000000981:diagnostic imaging / Q000502:physiology; D002138:Calibration; D007091:Image Processing, Computer-Assisted / Q000379:methods; D009068:Movement; D010780:Photogrammetry / Q000295:instrumentation* / Q000379:methods; D011856:Radiographic Image Enhancement; D011859:Radiography / Q000295:instrumentation* / Q000379:methods; D020311:Rheiformes; D012886:Skull / Q000000981:diagnostic imaging / Q000502:physiology*; D013314:Stress, Mechanical