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Results

The total mean standard deviation of inter-transponder distance for the entire group (n= 41) was: 0.7 mm apex-to left (AL), 0.7 mm left-right (LR), and 0.8 mm right-apex (RA). Corresponding values for the patients receiving AST were: 0.7 mm AL, 0.8 mm LR, and 0.8 mm RA, and for patients who did not receive AST: 0.8 mm AL, 0.7 mm LR, and 0.7 mm RA.

Conclusions

Implanted electromagnetic transponder markers maintain a stable geometry within the prostate gland over time in patients treated with AST and in patients treated with radiation therapy alone, consistent with gold fiducial markers used with x-rays for localization. The electromagnetic markers also provide continuous monitoring of the prostate throughout treatment delivery.