. Author manuscript; available in PMC: 2012 Sep 1.

Published in final edited form as: J Magn Reson. 2011 Jun 25;212(1):116–123. doi: 10.1016/j.jmr.2011.06.016

Table 2.

Hardware Characteristics of the Three Small-Animal MRI Scanners.

Hardware Component	System #1	System #2	System #3
Magnet	4.7 T, Oxford Mk I (i.d., 40.0 cm)	4.7 T, Oxford Mk II (i.d., 33.0 cm)	11.7 T, Magnex (i.d., 26.0 cm)
MRI Console	Varian DirectDrive^™ System	Varian DirectDrive^™ System	Varian UnityINOVA^™ system
Gradient Coil i.d.^a	21 cm	12 cm	8 cm
G_max	28 G/cm	58 G/cm	120 G/cm
t_rise (0 – G_max)	650 μs	270 μs	298 μs
I_max	300 A	300 A	200 A
slew rate (dG/dt)	0.043 G/cm·μs	0.215 G/cm·μs	0.403 G/cm·μs
RF Coil	linear Litz volume coil, 73 mm i.d.	linear Litz volume coil, 73 mm i.d.	quadrature Litzcage coil, 38 mm i.d.

All of these gradient sets were manufactured by Magnex Scientific (now a part of Agilent Technologies) and are water-cooled, actively-shielded, high-duty type coils.