UTC imaging is fully validated for the Achilles and patellar tendon. However, every straight tendon can be visualized. At the moment the tendons in the hand and wrist are being validated at the University of Umea in Sweden.
Since the rotary cuff is not a straight tendon, that is the only area where UTC imaging does not work.
Besides tendons though also muscles can be visualized and evaluated. At the moment it is more and more used on the hamstring and quadriceps.
Since UTC imaging is a new imaging technology, there are still areas that need validation for reference values and pathology but as said it works on all straight tendons.