Imaging for Physicists

Homogeneity

Uniform imaging volume at isocentre

Off-centre imaging? RT Planning?

40 cm

e.g. DSV 40cm

= 0.2 ppm

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

http://en.wikipedia.org/wiki/File:Finite_Length_So lenoid_field_radius_1_length_1.jpg#/media/File: Finite_Length_Solenoid_field_radius_1_length_ 1.jpg

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