WE-C-217BCD-02: Design of an MR Compatible Rotating Anode X-Ray Tube

Medical Physics
Prasheel V LillaneyRebecca Fahrig

Abstract

To design a rotating anode X-ray tube capable of operating in strong magnetic field environments. This tube design can be used in 'close proximity" hybrid X-ray/MR system geometries where the imaging fields of view are separated by only ∼1.2 meters. Existing rotating anode X-ray tube designs fail in strong magnetic field environments because the fields alter the electron trajectories in the tube and act as a brake on the induction motor, reducing the rotation speed of the anode. We propose an X- ray tube design that utilizes optimized resistive coils to shield a fraction of the MR fringe field. The remainder of the correction is performed using bias voltages on electrodes adjacent to the x-ray tube filament. Furthermore, we replace the induction motor with a novel motor design that is analogous to a three-phase brushed DC motor with the MR fringe field serving as the stator field. Space charge simulations of the electron optics show that the combined magnetostatic/electrostatic method can correct for a magnetic field strength of 152 mT with approximately 590 A/cm(2) applied to the shielding coils and a 35 kV potential difference applied to the bias electrodes. A prototype of the motor design was machined and assembled. The perf...Continue Reading

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