Magic angle magnetic resonance imaging of diode laser induced and naturally occurring lesions in equine tendons.

The research article discusses the application of magic angle magnetic resonance imaging in detecting chronic tendon lesions in horses, particularly those induced by diode lasers or occurring naturally. The key observation was the notable increase in T1 values in abnormal equine tendons, suggestive of alterations in the biochemical composition.

Overview of the Research

• The study centers on the use of magic angle magnetic resonance imaging, a technique that involves imaging tendons at 55° to the magnetic field. This method has proven useful in detecting chronic lesions within tendons in humans.
• T1 values refer to a type of relaxation time in MRI, where higher T1 values often signify certain types of tissue abnormalities. In the case of human patients, increased T1 values have been observed in instances of chronic tendinopathy.
• While T1 values for normal equine tendons have been documented, values for abnormal equine tendons remain unreported, which the study aimed to establish.

Methods and Findings

• In total, twelve equine limbs were used for study, classified into three groups: two limbs had diode laser tendon lesions induced postmortem, four limbs had similarly induced lesions while alive and the remaining six had naturally occurring tendon lesions.
• All limbs were subjected to imaging at 1.5 Tesla using both conventional MR imaging and magic angle MR imaging.
• Findings indicate that post-mortem laser-induced lesions could only be identified using magic angle MR imaging while both techniques successfully identified in vivo induced lesions and naturally occurring ones. Interestingly, these lesions exhibited different appearances based on the imaging technique used.
• Magic angle imaging was especially useful in identifying lesions that were not clearly visible in conventional imaging techniques, i.e., lesions that were hypointense.
• In all abnormal tendons, there was an observed increase in T1 values, with several tendons appearing subjectively normal on MR imaging also showing such an increase. This phenomenon indicates potential alterations in the biochemical composition of the tendons.

Conclusion and Implications

• The application of magic angle imaging extends beyond its present use with humans, potentially offering a noninvasive tool to study changes in equine tendons. By leveraging T1 values obtained through the technique, it can offer crucial insights into the extracellular matrix of tendons.
• Especially when conventional imaging fails to provide clarity, magic angle imaging may greatly augment the detection and study of tendon lesions in equines.