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Abstract #4158

Susceptibility-Based Positive-Contrast MRI for Interventional Devices

Ying Dong 1 , Guoxi Xie 2 , and Jim Xiuquan Ji 1

1 Department of Electrical and Computer Engineering, Texas A&M University, College Station, TX, United States, 2 Paul C. Lauterbur Research Center for Biomedical Imaging, Chinese Academy of Sciences, Shenzhen, Guangdong, China

Interventional devices normally show as dark features (negative contrast) on MRI. Several methods have been proposed to generate positive-contrast device images in interventional MRI. These methods generally rely on the off-resonance effects due to the devices high susceptibility, which highlight the surrounding areas instead of the devices themselves. Recently, we developed a novel method to generate positive contrast images of small devices such as brachytherapy seeds by direct susceptibility mapping. Technical advances of the method are reported here on imaging of medium/large devices such as biopsy needles on 3T systems.

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