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Abstract #2386

Zero TE based pseudo CT conversion: impact of different HU value assignment methods for bones in the Head.

Cristina Cozzini1, Mikael Bylund2, Sandeep Kaushik3, Joakim H Jonsson2, Josef A Lundman2, Mathias Engström4, Tufve Nyholm2, and Florian Wiesinger1

1GE Healthcare, Munich, Germany, 2Umeå University, Umeå, Sweden, 3GE Global Research, Bangalore, India, 4GE Healthcare, Stockholm, Sweden

Patient specific and accurate pseudo CT are needed for the adoption of MR-only in the radiation therapy workflow. Zero TE (ZTE) acquisition has proven to be very robust and reliable for bone segmentation, with the additional advantage of showing a reproducible inverse linear correlation with corresponding CT HU for ZTE intensity values in the bone range. Here we specifically investigate the impact on the dose accuracy of continuous versus single HU value assignment for bones and the strength of the Zero TE inverse linear correlation to CT values for accurate pseudo CT conversion.

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