Ultrasound Tissue Characterization of Human Achilles Tendon by Stability Quantification of Echo Patterns.

The assessment of tendon size and structure is commonly included in the clinical management of healthy athletes and different types of patients to personalize their training or rehabilitation. The quantitative analysis of the Achilles tendon structure described here can be performed with a recently introduced system that is non-invasive, relatively inexpensive, portable, radiation-free, and enables the rapid collection of accurate and reproducible data. It uses a standard ultrasound probe that is automatically displaced by a tracker in precise steps of 0.2 mm across the region of interest to collect successive two-dimensional ultrasound images that are then compiled into three-dimensional data-block. The measurement procedure is simple: a subject can be tested in 10-15 min, and a comprehensive report is automatically generated. The quantification of four different echo types enables the evaluation of the tissue integrity: this quantification can be useful for the diagnostic and prognostic assessment of patients with Achilles tendinopathy.