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Abstract #2202

Correction of B0 Field Distortion Induced by Stainless Steel Nuss Bar in Cardiac MRI Using Permanent Magnets

Zhiyue J. Wang1,2, Tarique Hussain1,2, Trung Nguyen1, Lorrie S. Burkhalter2, and Adam Alder1,2

1University of Texas Southwestern Medical Center, Dallas, TX, United States, 2Children's Health, Dallas, TX, United States

Pectus excavatum is often corrected by the Nuss procedure, in which a metal bar (usually made of stainless steel) is inserted horizontally into the chest cavity. MRI examination is important to assess the cardiac function with a focus on the right heart. The metal bar causes susceptibility artifacts in cine MRI. We explore the feasibility to improve the B0 field homogeneity using a field correction device to be placed on the surface of the chest utilizing permanent magnets. A device was constructed based on computer simulations. The device generates magnetic multipole fields and effectively improved B0 homogeneity in a phantom.

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