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Abstract #4134

Respiration resolved imaging using continuous steady state multiband excitation with linear frequency sweeps

Laurence H Jackson1, Anthony N Price1, Jana Hutter1, Lucilio Cordero-Grande1, Alison Ho1, Paddy J Slator2, Ana Dos Santo Gomes1, Joshua F.P. van Amerom1, Maria Murgasova1, Laura McCabe1, Mary A Rutherford1, and Joseph V Hajnal1

1Centre for the Developing Brain, School of Imaging Sciences and Biomedical Engineering, Kings College London, London, United Kingdom, 2Centre for Medical Image Computing, University College London, London, United Kingdom

Free-breathing abdominal MRI is challenging due to the unpredictable and complex 3D deformation caused by respiration. We present a novel acquisition where short TR single-band or multiband slice acquisitions are swept smoothly across the anatomy of interest while preserving steady state conditions. This is achieved by adding a frequency offset to successive RF pulses shifting the excited slice by fraction of slice thickness for each acquired k-space. This creates a highly efficient acquisition with high redundancy in respiration. A method is presented to produce 4D respiration-resolved volumes from this data and examples of human placenta and kidney are presented.

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