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Abstract #2115

Fast generation of pseudo-CT in the Head and Neck for MR guided Radiotherapy: Comparison of different UTE readout strategies

Michaela A U Hoesl1, Peter R Seevinck1, Matteo Maspero1, Gert J Meijer2, Jan J W Lagendijk1, Bas W Raaymakers1, and Cornelis A T van den Berg1

1Center of Image Sciences, University Medical Center Utrecht, Utrecht, Netherlands, 2Radiotherapy, University Medical Center Utrecht, Utrecht, Netherlands

Pseudo-CT (pCT) generation for Head and Neck region based on ultrashort echo time and radial under sampling is investigated in order to reach a clinical acceptable time frame for image acquisition. Two different UTE sequences, a 3D radial “kooshball” and a 3D radial “stack-of-stars” k-space acquisition are compared for image acquisition and pCT result using tissue classification and bulk density assignment. The results suggest that radial undersampling is feasible and thus results in a time frame of clinical relevance of 3 min for image acquisition plus 1 min for post-processing pCT generation.

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