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Abstract #1253

First Experiences with a Three-Bore Conduction-Cooled Cryogen-Free Extremity Scanner

Jerome L. Ackerman1,2, Shahin Pourrahimi3, Marcus Donaldson1,2, Nadder Pourrahimi3, Julien Rivoire4, Julien Muller4, Hizami Murad4, Ouri Cohen5, and Isabela Choi1
1Martinos Center, Dept of Radiology, Massachusetts General Hospital, Charlestown, MA, United States, 2Department of Radiology, Harvard Medical School, Boston, MA, United States, 3Superconducting Systems, Inc., Billerica, MA, United States, 4RS2D, Mundolsheim, France, 5Memorial Sloan Kettering Cancer Center, New York, NY, United States

We developed an MRI scanner designed for limb scanning based on a novel conduction-cooled three-bore cryogen-free 1.5T magnet. The two outer bores accommodate the unscanned leg for enhanced patient comfort. We describe the issues relevant to this unique magnet and scanner, including our solution to the field instability problem common in conduction-cooled MRI magnets. By recording the field variation as a function of the phase of the cold head cycle, a compensating waveform may be played out via the numerically-controlled oscillator of the scanner to reduce the periodic field excursion from 25 Hz to about 1-2 Hz.

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