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To create a shear wave, a high frequency ultrasound pulse ( “push pulse”) gently pushes the tissue a tiny amount (microns). The speed of the shear wave can be tracked for a few microseconds as it propagates outward over a small area (mm) from proximal to distal along the cervix. The video shows the prototype linear transducer that was used to generate the shear wave taped to the operator's finger, then a drawing of the transducer contacting the cervix. A linear transducer was used, as wave behavior can be complex and unpredictable with curvilinear transducers (such as a typical transvaginal transducer). The red box demonstrates the area where the shear wave was tracked in the cervix. Time (microseconds) is shown across the top. The Y axis shows depth (mm) into the cervix. The colors represent tissue displacement (microns) as shown in the bar on the right. See the related article by Feltovich et al (July 2017 issue). Video created by Lindsey Drehfal. Illustration by Helen Feltovich, MD, MS. Used with permission.
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