A focused ultrasound ("FUS"} system capable of use in a small bore imaging system, such as a small bore magnetic resonance imaging ("MRI"} system is provided. The FUS system generally includes an ultrasound transducer whose position is adjusted by a positioning system. The positioning system is sized to fit within the bore of the small bore imaging system. For instance, the positioning system can fit within a diameter of 150 millimeters or less.
