Index to Chiropractic Literature
Index to Chiropractic Literature
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ID 21624
  Title Computer modeling of selected projectional factors of the 84-in focal film distance anteroposterior full spine radiograph compared with 40-in focal film distance sectional views
URL http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3110406/
Journal J Chiropr Med. 2011 Mar;10(1):18-24
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Peer Review Yes
Publication Type Article
Abstract/Notes

Objective: The purpose of this study was to compare the 84-in focal film distance anteroposterior (A-P) full spine view to selected sectional views taken at a 40-in focal film distance for angles of divergence and changes produced by lateral translation and variation in source object distance.

Methods: Computer models were used to determine angles of divergence and study the effects of lateral translation and changes in source object distance.

Results: Lateral translation produced less projected axial (y-axis) vertebral rotation on the 84-in A-P full spine view than the film at 40 in. Angles of divergence are equal on the 14 × 17-in film at 40 in compared with the 84-in A-P full spine, and 70% of the 84-in full spine view is within the angles of divergence of the 40-in 10 × 12. The 84-in A-P full spine produced lowering and lengthening of the projected ilium when source object distance was reduced.

Conclusion: In this study, the 84-in A-P full spine produced less projected vertebral rotation on lateral translation. Its angles of divergence were greater than the 40-in 10 × 12 and equal to the 40-in 14 × 17-in film. Except for a 5.4-in section at both the upper and lower margins, the 84-in full spine view was within the angles of divergence of a 40-in 10 × 12. The full spine film produced projected ilium lengthening and lowering.

This abstract is reproduced with the permission of the publisher; click on the above link for free full text.


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