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Abstract #3331

Open-Source Gradient Impulse Response Function (GIRF) calibration measurements and their impact in Spiral acquisition

Tiago Timoteo Fernandes1, Andreia S Gaspar1, Andreia C. Freitas1, Nuno A. da Silva2, and Rita G Nunes1
1Institute for Systems and Robotics - Lisboa and Department of Bioengineering, IST-UL, Lisbon, Portugal, 2Hospital da Luz Learning Health, Lisbon, Portugal

A major challenge in MRI, particularly when aiming to reduce equipment costs, is to be able to cope with imperfect hardware performance. Even when using current clinical systems, calibration is often required to reduce image artifacts; an example is the impact of eddy-currents in spiral readouts. Here we controlled for this effect by determining the gradient impulse response function (GIRF) using an open source calibration pulse sequence, demonstrating the impact of the GIRF and its correction both through simulation and in real phantom data. This implementation will contribute towards the development of open source tools for spiral imaging.

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