Shim Channel
Z0 (shielded)
6000
Z3
490
Z2X/Z2Y
  1000
Z3X/Z3Y
120
ZC2/ZS2
1770
Z2C2/Z2S2
 93
C3/S3
185
ZC3/ZS3
   120
C4/S4
 19
RRI’s very high order shim insert (VHOS) addresses the strong susceptibility shifts arising from the frontal sinuses, oral cavity and auditory canals during MR at 3T and higher fields. These shifts, which cause dropout, signal voids and poor SNR, result from higher order field harmonic spatial terms and cannot be cancelled in standard commercial scanners, where shimming of impurities is implemented up to the 2nd order only.
Canceling Susceptibility Artifacts and Distortion
ZC4/ZS4
5.7
External Diameter
Internal Diameter
Shim Channels
Max Current/Channel
18
10 A
Length
Weight
730 mm
60 kg
Installation
The VHOS can be installed in most commercial scanners without requiring major hardware modifications. Installation requirements and procedures vary depending on the scanner type and make. Water cooling is required. PT-100 temperature sensors are provided (6 ea.). Safety interlocks, transport and lifting devices are included.
• Proprietary technology prevents shim to gradient coil coupling during pulsing sequences

• Improves data in non-axial orientations in true 3D studies

• Generous bore size easily accommodates complex RF coils, including multi transmitter arrays

•Short bore design does not interfere with patients’ shoulders

• Mechanically compatible with most commercial scanners

• Insert installation or removal can be performed in approximately 20 minutes

• High shimming efficiency at low power levels

• Can be supplied with matching high bandwidth shim amplifiers, compatible with commercial consoles

•Expands the capabilities of standard scanners
Key Benefits
Shim Strength, 10 A max
Strength
Applications:

Advanced head MR at 3T and higher fields, particularly of temporal and frontal lobes

fMRI BOLD, susceptibility weighted imaging and other methods that derive contrast from T2 weighting

High resolution MR spectroscopy
Click here for a full system block diagram!
Photo courtesy of Dr. Bernd Itterman PTB Berlin
VHOS-18
435 mm
380 mm
Click here to request a quote or for additional information
Click here to see 3D drawings of system integration.