| 摘要 |
<p>A radiotherapeutic apparatus has a patient support 10, magnetic coils 16 disposed around the patient support for magnetic resonance imaging, a radiation source 30 producing a beam of radiation directed toward the patient support and mounted on a rotatable chasis 28 thereby to rotate the radiation source around the patient support, a slip ring (50, figure 3) for conveying electrical power to the radiation source and located around the patient support, having at least one non-conductive section (60, figure 3) therein. This creates a slip ring in which there is no continuous circumferential path so the current is forced to take a route via one side or the other. Preferably, the non-conducting section covers an arc smaller than that between the two brushes (208, 210, figures 5 & 6) which take off power. A corresponding treatment planning apparatus and method of generating a treatment plan are also disclosed.</p> |
