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Abstract #3524

A Method for Correcting Non-linear Errors in Radial Trajectories

Hideaki Kutsuna1, Sho Kawajiri2, and Hidenori Takeshima3
1MRI Systems Development Department, Canon Medical Systems Corporation, Kanagawa, Japan, 2MRI Systems Development Department, Canon Medical Systems Corporation, Tochigi, Japan, 3Advanced Technology Research Department, Research and Development Center, Canon Medical Systems Corporation, Kanagawa, Japan

The authors propose a new method to use a non-linear model for correcting errors in radial trajectories. The model represents shifts of trajectories as a combination of a linear function and a sigmoid function.

Conventional methods assume that the shifts are proportional to the gradient strengths. However, actual trajectories cannot be represented as linear models precisely due to non-linear imperfections of the gradients such as eddy currents.

The proposed method suppresses streak artifacts and image shadings which appear with conventional linear correction.

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