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Abstract #3802

Reduction of susceptibility artifacts in MR of permanent prostate gold seed for radiotherapy

Abby Y Ding1, Leon Ho1, K.T Chan2, Jing Yuan1, Kin Yin Cheung1, and Siu Ki Yu1

1Medical Physics & Research Department, Hong Kong Sanatorium & Hospital, Hong Kong, China, 2Department of Radiotherapy, Hong Kong Sanatorium & Hospital, Hong Kong, China

Stereotactic body radiation therapy for prostate cancer is a highly precise radiotherapy. Post-implant MR is important for target localization, contouring and treatment planning. A phantom was designed to investigate the susceptibility caused by gold seeds in different orientations relative to B0 field. 2D and 3D acquisition scheme at various resolution, bandwidth and frequency-encoding directions were examined. Our results show that for reduction of susceptibility artifacts and excessive local signal loss, resolution of higher than 0.5mm is recommended, increasing bandwidth with sufficient resolution is more practical than changing frequency-encoding directions. 3D is comparable to 2D sequence in susceptibility artifacts.

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