Effects of X-ray Beam Angle and Geometric Distortion on Width of Equine Thoracolumbar Interspinous Spaces Using Radiography and Computed Tomography: A Cadaveric Study.

This research article discusses the impact of X-ray beam angle and geometric distortion on the measurements of spaces between the thoracolumbar processi spinosi (interspinous spaces) of sports horses. Radiography often assess these spaces, however, the study suggests that these factors can significantly affect the measurements, which should be factored in when evaluating sport horses.

Objectives and Methodology

• The study is a prospective, observational research that aimed to understand the influence of X-ray beam angle on the apparent widths of interspinous spaces in sports horses.
• In the study, thoracolumbar spine specimens were collected from six equine cadavers. The researchers utilized left-right lateral radiographs and sagittal and dorsal reconstructed computed tomographic (CT) images for the study.
• A total of 49 interspinous spaces were sampled for the research, where measurements were performed for each interspinous space in focus position and up to eight angled positions as the interspinous space moved away from the focus.

Results

• Findings highlighted that the X-ray beam angle significantly affected the measured width of interspinous spaces in position +3, with varying changes not following a certain pattern.
• Furthermore, interspinous space widths in focus position were significantly smaller in radiographs as compared to matching reconstructed CT images for backs diagnosed with kissing spine syndrome.
• The researchers also noted geometric distortion as a significant factor that markedly affected the appearance of interspinous space width between planes.

Conclusion

• In conclusion, the study provides crucial insight into the limitations of using radiography in assessing the interspinous spaces in sports horses.
• X-ray beam angle and geometric distortion can significantly influence the results, thus necessitating the consideration of these factors in such evaluations.
• This has potential implications for the diagnosis and management of conditions in sports horses, such as kissing spine syndrome, impacting the accuracy, and the subsequent treatment strategies that rely on these measurements.