Accuracy of MRI technique in measuring tendon cross-sectional area.

The research article investigates the accuracy of Magnetic Resonance Imaging (MRI) in measuring the Cross-Sectional Area (CSA) of tendons, comparing MRI results with direct measurements from a mould casting technique. The findings suggest that the standard MRI techniques underestimate the CSA of tendons, but this gap can be minimized by using a stronger 3 tesla MRI and specific colour scales.

Research Purpose and Methodology

• The main aim of this research was to evaluate the accuracy of MRI, a common technique used for measuring the cross-sectional area (CSA) and length of tendons. This is significant in studying structural changes in the tendon, as well as in normalizing mechanical measurements to stress and strain.
• To evaluate the accuracy of MRI, the researchers performed an MRI scan of a horse’s knee using two different levels of intensity – 1.5 and 3 tesla. The CSA of the patellar tendon was measured by two different examiners.
• Following this, the patellar tendon was dissected and encased in an alginate mould. The actual CSA of the tendon was then measured directly with the help of optical imaging of the mould impression.
• The CSA measurements from the MRI scans were then compared with the actual measurements from the mould casting technique.

Findings and Interpretations

• The study found that the CSA measurements of the tendon taken using the 1.5 tesla and 3 tesla MRI scans were 16.5% and 13.2% lower, respectively, than the actual CSA as measured from the mould.
• When the measurements were based on the red-green border on the National Institute of Health (NIH) colour scale, the underestimation was significantly lower, at around 2.8% for the 3 tesla MRI images.
• The variance between the examiners measuring the CSA was consistently below 2%, thereby highlighting the reproducibility of the CSA measurements.
• The research thus suggests that while MRI techniques can underestimate the CSA of tendons, this shortcoming can be minimized substantially by using a 3 tesla MRI and following the NIH colour scale.

Conclusion and Implications

• The study concludes that while there exists a certain degree of discrepancy in tendon CSA measurements between MRI methods and the direct mould casting technique, technology advancements can help narrow this gap.
• The findings hold particular significance for research, clinical diagnosis, and treatment planning involving tendon-related injuries and disorders, as they offer pathways for obtaining more accurate measurements and assessments.