MR conditional stirrups would be beneficial in MR-guided gynecological and prostate brachytherapy but have not been clinically available. Evaluation of a prototype Diacor MR conditional board and stirrups system revealed no significant projectile or heating risks at 3T. The maximum temperature measured on its metallic surfaces after scanning was 22 ⁰C, relating to a 3 ⁰C increase. The stainless steel blades of the stirrup joints caused signal cancellation artifacts which extended radially up to 23cm on phantom images. On volunteer scans, artifacts were observed in posterior hip areas only. Pelvic organ visualization was considered suitable for brachytherapy treatment planning.
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