title: Biomechanical analysis by chiropractic radiography: Part I. A simple method for determining X-ray projectional distortion.
abstract: Projectional distortion is known to produce artifactual disrelationships between the images of osseous segments on X-ray film. Apparatus and methods were developed to measure the effect of projectional distortion on a human third lumbar vertebra. The procedures for mathematical analysis of such distortion are outlined, and the results of studies to determine the accuracy of the procedure are presented.
mesh_terms: D001696:Biomechanical Phenomena; D002684:Chiropractic; D006801:Humans; D008159:Lumbar Vertebrae / Q000000981:diagnostic imaging* / Q000502:physiology; D008433:Mathematics; D011859:Radiography; D013238:Stereotaxic Techniques