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Abstract #3584

Shimming a Halbach Magnet for TRASE MRI on the International Space Station

Aaron R. Purchase1, Christopher Sedlock1, Gordon E. Sarty2, Jonathan C. Sharp1, and Boguslaw Tomanek1
1Oncology, University of Alberta, Edmonton, AB, Canada, 2Biomedical Engineering, University of Saskatchewan, Saskatoon, SK, Canada


Astronauts experience detrimental loss to bone and muscle during long-term space flight. MRI is desired to monitor bone and muscle loss, but current portable systems remain unsuitable for the International Space Station (ISS). We built a 25 kg dipolar Halbach magnet dedicated to the transmit array spatial encoding (TRASE) method over a cylindrical region of interest (ROI), which satisfies the requirements for MRI on the ISS. Still, the natural axial gradient is not well suited to slice selection because it has a quadratic-type profile producing unwanted aliasing. We propose a technique to implement a linear axial B0 gradient for encoding.

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