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In this patient with a normal wrist, the transducer was rocked back and forth to demonstrate the appearance of anisotropy. (1: flexor digitorum tendons. 2: flexor carpi radialis. 3: palmaris longus. 4: median nerve). Note how anisotropy increases the contrast between the tendon and nerve against the surrounding fat.
1. 15MHz transducer insonating the wrist flexor tendons at 90 degrees (perpendicular to the tendon fibers).
2. 15MHz transducer insonating the wrist flexor tendons at 45 degrees.
3. Cine clip with a 15MHz (hockey stick) transducer. The transducer is rocked between angle of 45 - 135 degrees with respect to the long axis of the tendons and nerve. The tendon is maximally brightest at 90 degrees.