Figure 3.

(a) SolidWorks rendering of the transducer-cylinder assembly. The custom 11-channel RF coil array and associated pre-amplifiers are shown attached to the cylinder. The entire assembly can be rotated approximately 150° in a plane parallel to the scanner table. The transducer can be tilted an additional ±7.5° in the same plane and ±22° in the vertical plane around a nominal 17° tilt axis. (b) Side and (c) top views of the treatment volume (TV) within the cylinder that is possible using the limits imposed by the 60-cm diameter bore of the Siemens 3 T Trio MRI scanner. This volume includes the electronic steering capabilities of the transducer. A model of the breast shown in Fig. 10 is seen in Fig. 3b.