Gradients and Shims

SHIELDED GRADIENTS WITH INTEGRATED SHIMS FOR ANIMAL IMAGING

BFG SERIES

With maximized duty cycles and gradient strength, short rise times, very high gradient uniformity and large DSV, the BFG series of high performance gradients was designed for advanced techniques and applications, such as echo-planar imaging, angiography and localized spectroscopy at high magnetic fields.

Design parameters of each unit from this series can be customized to match the parameters of existing gradient amplifiers. The BFG series is supplied with 14 channels of integrated shims, or 7 channels of extra strong shims that can be driven at higher currents.

Z2 and Z4 shim coils are wound using NetZero^TM technology, which prevents coupling to the magnet coils.

Gradient tube model BFG-150/90-750-S

150 mm OD, 90 mm ID, 750 mT/m at 200A

SPECIFICATIONS

Model BFG-xx/xx-S	120/60	150/90	240/120	240/150	300/200	400/260
Dimensions [mm]
OD	120	152	240	245	305	400
ID	60	90	120	152	205	260
Gradient Strength [mT/m]
@ 150 A	1,500	-	-	-	-	-
@ 200 A	-	770	-	300	200	155
@ 300 A	-	-	-	450	300	230
@ 325 A	-	-	1,000	-	-	-
Gradient Rise Time [ms]
@ 150 A, 300 V	100	-	-	-	-	-
@ 200 A, 300 V	-	100	-	130	260	280
@ 300 A, 600 V	-	-	-	130	180	180
@ 325 A, 700 V	-	-	150	-	-	-
Linearity
Field linearity [%]	+/-5	+/-5	+/- 5	+/- 5	+/- 5	+/- 5
DSV [mm]	35	60	60	80	120	130

Shielded	Yes	Yes	Yes	Yes	Yes	Yes
Z0 Compensation	Yes	Yes	Yes	Yes	Yes	Yes
Input Cables	Coaxial	Coaxial	Coaxial	Coaxial	Coaxial	Coaxial

Shim Strengths [¹H Hz/cmⁿ/A]
Z0(*)	2,100 Hz/A	2,100 Hz/A	2,100 Hz/A	2,100 Hz/A	2,100 Hz/A	2,100 Hz/A
Z2 (*)	1,840	1,030	200	230	68	34
Z3(*)	420	78	16	18	4	2
Z4	110	10	-	3	1	1
ZX / ZY (*)	5,140	405	155	210	160	80
C2 / S2 (*)	2,210	278	120	90	48	24
Z2X / Z2Y	1,320	35	-	8	4	2
ZC2 / ZS2	950	70	-	15	9	4
C3 / S3	510	33	-	9	5	2
Maximum current per channel [A]
14 Shim channels	5	5	-	10	10	10
7 Shim channels	10	10	20	10	10	10

(*) 7 shim coils systems.