Keywords: Tendon/Ligament, Quantitative Imaging, T2*, Bi-exponential, UTE, CONESTendon laxity can cause pain and increased injury risk. Quantitative MRI using Ultrashort echo time (UTE) sequences can quantify both short and long T2* water components in tendons. This study evaluates the sensitivity of UTE-T2* mapping with a bi-exponential fit model to tendon laxity, in the Achilles tendon under tension and relaxation. T2*long values seemed to increase as tendon load increased, while T2*short values were the opposite. These changes may be caused by water movement due to loading and changes in fiber orientation due to tendon slackening.
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