Abstract #5555

Clinical evaluation of automatic localization of prostate gold Fiducial Markers for MR-only Radiotherapy

Matteo Maspero¹, Cornelis AT van den Berg¹, Frank Zijlstra¹, Hans C de Boer^1,2, Gert J Meijer^1,2, Max A Viergever¹, Jan JW Lagendijk^1,2, Linda GW Kerkmeijer^1,2, and Peter R Seevinck¹

¹Center for Image Sciences, UMC Utrecht, Utrecht, Netherlands, ²Cancer Center, UMC Utrecht, Utrecht, Netherlands

A novel approach aiming at automatic localization of gold Fiducial Markers (FMs) used in prostate radiotherapy to accurately perform patient positioning is presented and evaluated. The proposed method correctly detected 49/51 FMs in 17 patients when compared to FMs locations manually detected on MR. The spatial accuracy (median) and precision (STD) achieved were 0.2 mm, and 1.2 mm, respectively, when compared to relative FMs locations obtained with CT. When combined with a manual check, this approach could be a safe way to eliminate CT during radiotherapy planning, facilitating an MR-only workflow.

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