Abstract #4320

Direct CT conversion from a single ultra-short echo sequence

Soumya Ghose¹, Jason Dowling¹, Robba Rai², Benjamin Schmitt³, and Gary Liney^2,4,5,6

¹eHealth, CSIRO, Brisbane, Australia, ²Liverpool Cancer Therapy Centre, Liverpool, Australia, ³Siemens Healthcare Pty Ltd, Macquarie Park, Australia, ⁴Medical Physics, Ingham Institute, Liverpool, Australia, ⁵UNSW Australia, Liverpool, Australia, ⁶University of Wollongong, Wollongong, Australia

Accurate conversion of MRI into attenuation correction maps is of current interest in PET-MR and MR-only radiotherapy planning in particular, where electron density calculation is particularly demanding and usually derived from CT. MRI methods to date have usually involved building a patient atlas and/or use of multiple imaging sequences and are time intensive. We propose a new single sequence approach based on ultra-short echo time to identify tissue classes of air, bone and soft-tissue in combination with a dynamic clustering regression based model that provides a direct CT conversion which is both efficient and accurate.

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