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Abstract #1386

Measuring the Spatial Magnetic Field Gradients within a Scanner Bore

Karlene M Fraser 1,2 , Elizabeth Morris 3 , Jonathan Ashmore 4 , Stephen Wastling 2 , Ruth O'Gorman 4,5 , and Gareth Barker 2

1 Neuroimaging, Maudsley Hospital, London, United Kingdom, 2 Centre for Neuroimaging Sciences, King's College London, London, United Kingdom, 3 Medical Engineering and Physics, King's College Hospital, London, United Kingdom, 4 Neuroradiology, King's College Hospital, London, United Kingdom, 5 Centre for MR Research, University Children's Hospital, Zurich, Switzerland

Manufacturers of medical implants and devices classify some as MR conditional, and specify maximum spatial magnetic field gradient (MFG) restrictions in G/cm or T/m. Measurements of the MF within the bores of a 1.5T and 3.0T HD.x, and two 3.0T MR750 MR scanners were obtained using a THM1176 Hall probe. Maximum spatial MFG calculated for the 1.5T and each 3.0T scanner was respectively over 400 G/cm and 700 G/cm, and approximately 1.5 and 2 times less that reported by the scanner manufacturer. Had the manufacturers measurements been restricted to the patient accessible area, our measurements may have been more comparable.

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