Research Masterclass in Radiotherapy Physics 2017

Homogeneity of the main magnetic field

B 0

e.g. uniformity in diameter of spherical volume DSV 40cm

= 0.2

ppm

(at 1.5 T): 0.2 x 63.87 MHz = 12.8 Hz

• Magnet is shimmed at installation- additional (dynamic) shimming may be required