The Model 604-GS provides a tissue-like imaging environ
ment for assessing geometric distortion in whole-body MRI 
scanners. The 604-GS is designed to assess image distortion 
caused by B0
 inhomogeneity and nonlinearity of the magnetic 
gradients. Unlike other air-filled phantoms, the liquid-filled 
604-GS is also sensitive to chemical shifts and susceptibility 
artifacts, additional causes of distortion found when encoun
tering density differences in diagnostic MRI and radiation 
therapy treatment planning.
 The phantom features a unique orthogonal 3D grid that 
provides complete geometric data throughout the imaging 
volume. Users can fill the phantom with the AAPM TG 100 
recommended solution, or with specialized solutions for high
f
 ield MRI or unique scan sequences. Ground-truth measure
ments of grid locations can be obtained through CT scanning 
of the phantom.
 The phantom is marked for ease of alignment to position la
sers and is designed for use with both curved and flat gantry 
tables.
 900 Asbury Ave • Norfolk, Virginia 23513 • USA 
Tel: 800.617.1177 • 757.855.2765 • Fax: 757.857.0523
 WWW.CIRSINC.COM
 Features
 • With a tissue-like MRI signal, assess image distortion 
due to:
 • B0
 field inhomogeneities
 • Gradient nonlinearity
 • Chemical shifts 
• Susceptibility artifacts
 • Compatible with Distortion Check software (Free trial. 
See back for details)
 • Submillimeter control point detection
 • Optimized 3D grid spacing fills entire volume
 • 2152 control points
 • Easy integration and laser alignment
 • Ground truth files for grid available