| CPC A61B 8/4444 (2013.01) [A61B 8/0808 (2013.01); A61B 8/4209 (2013.01); A61B 8/488 (2013.01)] | 7 Claims |

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1. A system, comprising:
a probe configured to emit acoustic energy and comprising a hollow cavity disposed within a center portion of the probe;
a sensor configured to output a signal indicating an amount of force exerted against the probe when the probe is against a surface of a subject and comprising a cylindrical protrusion extending into the hollow cavity to align the probe and the sensor; and
a probe hub, wherein the probe, the sensor, and the probe hub are aligned through an axis.
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