1. A medical ultrasound system, comprising: an ultrasound probe; and an accessory attached to the ultrasound probe, wherein the medical ultrasound system is configured for one or both of: exchanging data between the ultrasound probe and the accessory via a communication interface, the communication interface that includes a fiber-optical coupling mechanism such that the data can be optically exchanged between the ultrasound probe and the accessory, and supplying electrical power from the ultrasound probe to the accessory via a power interface, wherein the accessory is coupled with the ultrasound probe across a medical procedural barrier, the medical procedural barrier disposed adjacent the ultrasound probe, wherein the accessory includes a fiber optic system including an optical fiber having a number of sensors disposed along a length of the optical fiber, and the data includes one or more of: doppler data related to fluid or tissue motion adjacent the optical fiber; an image acquired by the optical fiber; a shape or strain of the optical fiber; or a motion of the optical fiber, and wherein the optical fiber is configured for advancement along a blood vessel.