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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